36 results on '"elastic settlement"'
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2. The Effect of Footing Shape on the Elastic Modulus of Soil
- Author
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Pantelidis, Lysandros, Pisello, Anna Laura, Editorial Board Member, Hawkes, Dean, Editorial Board Member, Bougdah, Hocine, Editorial Board Member, Rosso, Federica, Editorial Board Member, Abdalla, Hassan, Editorial Board Member, Boemi, Sofia-Natalia, Editorial Board Member, Mohareb, Nabil, Editorial Board Member, Mesbah Elkaffas, Saleh, Editorial Board Member, Bozonnet, Emmanuel, Editorial Board Member, Pignatta, Gloria, Editorial Board Member, Mahgoub, Yasser, Editorial Board Member, De Bonis, Luciano, Editorial Board Member, Kostopoulou, Stella, Editorial Board Member, Pradhan, Biswajeet, Editorial Board Member, Abdul Mannan, Md., Editorial Board Member, Alalouch, Chaham, Editorial Board Member, O. Gawad, Iman, Editorial Board Member, Nayyar, Anand, Editorial Board Member, Amer, Mourad, Series Editor, El-Askary, Hesham, editor, Erguler, Zeynal Abiddin, editor, Karakus, Murat, editor, and Chaminé, Helder I., editor
- Published
- 2022
- Full Text
- View/download PDF
3. Seismic Bearing Capacity and Elastic Settlement of Footing on Slopes
- Author
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Das, Sukanta, Maheshwari, B. K., di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Sitharam, T. G., editor, Dinesh, S. V., editor, and Jakka, Ravi, editor
- Published
- 2021
- Full Text
- View/download PDF
4. Effect of Interaction of Nearby Footings on Settlement of Foundation Under Building
- Author
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Alam, Jahangir, Islam, Muhammad Saiful, Islam, Mahmudul, Uddin, Nazam, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Prashant, Amit, editor, Sachan, Ajanta, editor, and Desai, Chandrakant S., editor
- Published
- 2020
- Full Text
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5. Semi-Analytical Approach for Estimating the Viscoelastic Settlement of a Footing Resting on a Slope
- Author
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Haghgouei, Hadi, Kargar, Ali Reza, Khosravi, Mohammad Hossein, and Amini, Mehdi
- Published
- 2022
- Full Text
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6. Comparative Analysis of Kazakhstani and European Design Specifications: Raft Foundation, Pile Foundation, and Piled Raft Foundation.
- Author
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Zhanabayeva, Assel, Sagidullina, Nazerke, Kim, Jong, Satyanaga, Alfrendo, Lee, Deuckhang, and Moon, Sung-Woo
- Subjects
BUILDING foundations ,COMPARATIVE studies ,SOIL profiles ,SAFETY factor in engineering ,TECHNICAL specifications - Abstract
The introduction of Eurocode in Kazakhstan allows for the application of modern technological innovations and the elimination of technical barriers for the realization of international projects. It is significant to study the international standards and design requirements provided in Eurocode. This study presents a comparative analysis of Kazakhstani and European approaches for the geotechnical design of foundations and provides the design methods in the considered codes of practice. Three different types of foundations (i.e., raft, pile, and piled raft foundations) were designed following SP RK 5.01-102-2013—Foundations of buildings and structures, SP RK 5.01-103-2013—Pile foundations, and Eurocode 7: Geotechnical design for the Nur-Sultan soil profile. For all three types of foundations, the calculated results of bearing resistance and elastic settlement showed the conservativeness of Eurocode over SNiP-based Kazakhstani building regulations, as the values of bearing resistance and elastic settlement adhering to Kazakhstani code exceeded the Eurocode values. The difference between the obtained results can be explained by the application of higher values of partial safety factors by Eurocode 7. Sensitivity analysis of the bearing resistance on foundation parameters (i.e., raft foundation width and pile length) for the Kazakhstani and European approaches was performed to support the conclusions of the study. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
7. Performance of Helix Piled Raft Foundation in Tropical Fibrous Peat Soil Under Traffic Loads.
- Author
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Arsyad, A., Muhiddin, A. B., Harianto, T., Budianto, E., Sangle, P., and Firmansyah, A. B.
- Subjects
PEAT soils ,BUILDING foundations ,BEARING capacity of soils ,POISSON'S ratio ,SHEAR strength of soils ,DYNAMIC loads - Published
- 2021
8. Comparative Analysis of Kazakhstani and European Approaches for the Design of Shallow Foundations.
- Author
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Shaldykova, Assel, Moon, Sung-Woo, Kim, Jong, Lee, Deuckhang, Ku, Taeseo, and Zhussupbekov, Askar
- Subjects
SHALLOW foundations ,SETTLEMENT of structures ,CONSTRUCTION laws ,COMPARATIVE studies ,BUILDING foundations ,ELASTIC foundations - Abstract
The design of shallow foundations is performed in accordance with different building regulations depending on geotechnical and geological conditions. This paper involves the design calculations applying Kazakhstani and European approaches. The design of shallow foundations in Nur-Sultan city in Kazakhstan was implemented by the calculation of bearing capacity and elastic settlement in accordance with the design procedures provided in SP RK 5.01-102-2013: Foundations of buildings and structures, and Eurocode 7: Geotechnical design. The calculated results of bearing capacity and elastic settlement for two types of shallow foundations, such as pad foundation and strip foundation, adhering to Kazakhstani and European approaches are relatively comparable. However, the European approach provided higher values of bearing capacity and elastic settlement for the designed shallow foundation compared to the Kazakhstani approach. The difference in the results is explained by the application of different values of partial factors of safety for the determination of bearing capacity and different methods for the calculation of the elastic settlement of shallow foundations (i.e., elasticity theory and layer summation method). [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
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9. Axial Capacity of Single Drilled Shaft Foundations in Soil
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Yamin, Mohammad and Yamin, Mohammad
- Published
- 2016
- Full Text
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10. Axial Capacity of Single Pile Foundations in Soil
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Yamin, Mohammad and Yamin, Mohammad
- Published
- 2016
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11. Shallow Foundations on Homogeneous Soil
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Yamin, Mohammad and Yamin, Mohammad
- Published
- 2016
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12. BEHAVIOUR OF STRIP FOOTINGS ON SANDS REINFORCED BY GEOCELL AND RUBBER PARTICLES SUBJECTED TO CYCLIC LOADING
- Author
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M. Mohammadi, S. M. Mir Mohammad Hosseini, and M. Kargar
- Subjects
geocell ,geocell ,strip footing ,strip footing ,bearing capacity ,bearing capacity ,tire shreds ,tire shreds ,tire particles ,tire particles ,plastic settlement ,plastic settlement ,elastic settlement ,elastic settlement ,cyclic loading ,cyclic loading ,Building construction ,TH1-9745 - Abstract
Geosynthetics have been extensively used as soil reinforcements under footings especially in soft grounds. Geocell is a form of three-dimensional reinforcement which is able to provide greater bearing capacity due to confinement compared to planar types of reinforcements like geogrids and geotextiles. On the other hand, using tire shreds, in addition to improving soil properties would have favourable environmental effects that causes a great tendency for its utilization in engineering projects. In order to study the cyclic and post-cyclic behaviours of strip footings on sands reinforced by geocells and rubber particles, a small-scale physical model in soil mechanics laboratory of Amirkabir University of Technology has been developed. Main parts of the laboratory apparatus include the footing model, the soil container, raining system, loading equipment and data acquisition system. Geocells with different geometrical dimensions, yet the same material have been used in a specific location in sand layers. To investigate the effect of rubber particle size mixed with sand as the geocell infill material, the geocell pockets have been filled with different materials; namely pure sand, pure rubber particles and mixture of rubber particles and sand at desired densities. Then a static loading is applied to the footing followed by a cyclic loading up to 1000 load cycles. Finally, the static loads are re-applied until failure occurs. The study's results indicate that in similar compaction condition, substituting a percentage of sand with rubber particles of greater size leads to reduction in plastic settlement and increment in elastic settlement. In the case of mixing sand with rubber powder with the smaller particle size, the settlement would increase while the bearing capacity decreases. Therefore, it is concluded that using the mixture of soil and rubber particles of greater particle sizes compared to soil grains would improve the cyclic behaviour of reinforced soil by decreasing the permanent or plastic settlements.
- Published
- 2018
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13. Comparative Analysis of Kazakhstani and European Design Specifications: Raft Foundation, Pile Foundation, and Piled Raft Foundation
- Author
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Assel Zhanabayeva, Nazerke Sagidullina, Jong Kim, Alfrendo Satyanaga, Deuckhang Lee, and Sung-Woo Moon
- Subjects
raft foundation ,pile foundation ,piled raft foundation ,bearing resistance ,elastic settlement ,SNiP ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
The introduction of Eurocode in Kazakhstan allows for the application of modern technological innovations and the elimination of technical barriers for the realization of international projects. It is significant to study the international standards and design requirements provided in Eurocode. This study presents a comparative analysis of Kazakhstani and European approaches for the geotechnical design of foundations and provides the design methods in the considered codes of practice. Three different types of foundations (i.e., raft, pile, and piled raft foundations) were designed following SP RK 5.01-102-2013—Foundations of buildings and structures, SP RK 5.01-103-2013—Pile foundations, and Eurocode 7: Geotechnical design for the Nur-Sultan soil profile. For all three types of foundations, the calculated results of bearing resistance and elastic settlement showed the conservativeness of Eurocode over SNiP-based Kazakhstani building regulations, as the values of bearing resistance and elastic settlement adhering to Kazakhstani code exceeded the Eurocode values. The difference between the obtained results can be explained by the application of higher values of partial safety factors by Eurocode 7. Sensitivity analysis of the bearing resistance on foundation parameters (i.e., raft foundation width and pile length) for the Kazakhstani and European approaches was performed to support the conclusions of the study.
- Published
- 2021
- Full Text
- View/download PDF
14. An Investigation on the Settlement of Shallow Foundations Resting on Cross-Anisotropic Soil Deposits
- Author
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Jamali, Nazanin, Veiskarami, Mehdi, and Jamshidi Chenari, Reza
- Published
- 2021
- Full Text
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15. Study on Settlement Behaviour of Annular Raft Foundation using Finite Element–Boundary Element Method
- Author
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Shiuly, Amit and Roy, Supriya
- Published
- 2021
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16. Elastic Settlement Analysis of Rigid Rectangular Footings on Sands and Clays
- Author
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Lysandros Pantelidis and Elias Gravanis
- Subjects
elastic settlement ,shallow foundations ,rigid footings ,contact pressure ,equivalent shape ,Geology ,QE1-996.5 - Abstract
In this paper an elastic settlement analysis method for rigid rectangular footings applicable to both clays and sands is proposed. The proposed method is based on the concept of equivalent shape, where any rectangular footing is suitably replaced by a footing of elliptical shape; the conditions of equal area and equal perimeter are satisfied simultaneously. The case of clay is differentiated from the case of sand using different contact pressure distribution, whilst, additionally, for the sands, the modulus of elasticity increases linearly with depth. The method can conveniently be calibrated against any set of settlement data obtained analytically, experimentally, or numerically; in this respect the authors used values which have been derived analytically from third parties. Among the most interesting findings is that sands produce “settlement x soil modulus/applied pressure” values approximately 10% greater than the respective ones corresponding to clays. Moreover, for large Poisson’s ratio (v) values, the settlement of rigid footings is closer to the settlement corresponding to the corner of the respective flexible footings. As v decreases, the derived settlement of the rigid footing approaches the settlement value corresponding to the characteristic point of the respective flexible footing. Finally, corrections for the net applied pressure, footing rigidity, and non-elastic response of soil under loading are also proposed.
- Published
- 2020
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17. Comparative Analysis of Kazakhstani and European Approaches for the Design of Shallow Foundations
- Author
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Assel Shaldykova, Sung-Woo Moon, Jong Kim, Deuckhang Lee, Taeseo Ku, and Askar Zhussupbekov
- Subjects
comparative analysis ,shallow foundation design ,bearing capacity ,elastic settlement ,Eurocode 7 ,SP RK ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
The design of shallow foundations is performed in accordance with different building regulations depending on geotechnical and geological conditions. This paper involves the design calculations applying Kazakhstani and European approaches. The design of shallow foundations in Nur-Sultan city in Kazakhstan was implemented by the calculation of bearing capacity and elastic settlement in accordance with the design procedures provided in SP RK 5.01-102-2013: Foundations of buildings and structures, and Eurocode 7: Geotechnical design. The calculated results of bearing capacity and elastic settlement for two types of shallow foundations, such as pad foundation and strip foundation, adhering to Kazakhstani and European approaches are relatively comparable. However, the European approach provided higher values of bearing capacity and elastic settlement for the designed shallow foundation compared to the Kazakhstani approach. The difference in the results is explained by the application of different values of partial factors of safety for the determination of bearing capacity and different methods for the calculation of the elastic settlement of shallow foundations (i.e., elasticity theory and layer summation method).
- Published
- 2020
- Full Text
- View/download PDF
18. A simplified approach to predict neutral plane and estimate drag forces on drilled shafts resulting from deformation in soil caused by a heavily loaded adjacent shallow foundation using ‘Isodefers’.
- Author
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Jha, Pravin and Kumar, Sanjeev
- Abstract
Construction of foundations close to each other, which results in substantial interaction between them, has become a common practice. However, not much literature is available for practicing engineers to analyse and design deep and shallow foundations when they are constructed adjacent to each other. This study analyses one such scenario where a structure supported on drilled shafts was supposed to be constructed adjacent to another structure supported on a large mat foundation with heavy floor load. A detailed parametric study using finite element techniques was performed to better understand stress distributions and develop simplified methods to analyse this type of problems. Lateral stress and drag forces on the shafts resulting from the heavy load on the mat foundation were identified to be the key factors. This paper is focused on estimating the drag forces. A deformation bulb under a uniformly loaded square foundation, similar to the well-known pressure bulb, is proposed. A new term ‘Isodefers’ has been proposed to refer the lines of equal deformation. Isodefers are a significant tool for practicing engineers to understand vertical deformation distribution below a uniformly loaded square area and estimate drag forces on nearby deep foundations by determining its neutral plane. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
19. The Effect of Footing Shape on the Elastic Modulus of Soil
- Author
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Lysandros Pantelidis
- Subjects
Plane strain conditions ,Footing shape ,Shallow foundations ,Elastic settlement ,Engineering and Technology ,Modulus of elasticity ,Winkler’s spring analysis ,Civil Engineering - Abstract
In practice, geotechnical engineers often use triaxial elastic soil property values derived from the corresponding test or continuous probing test results (e.g. Cone Penetration Test), even for structures deforming under plane strain conditions, such as strip footings. Review of the available theoretical and experimental studies, however, led to the following observations: the triaxial elastic modulus differs from the respective plane strain one and in addition to the aspect ratio of footing, the soil modulus depends on the thickness of the soil medium. Based on experimental findings and on the elastic theory and using a sequential way of thinking, the elastic settlement at the centre of a B × L footing is suggested that be calculated considering the respective B × B footing along with the original distributed loading value.
- Published
- 2022
20. Elastic settlement of ring foundations.
- Author
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Naseri, Mojtaba and Hosseininia, Ehsan Seyedi
- Abstract
In this paper, numerical computations using the finite difference method are carried out in order to investigate the settlement of ring foundations resting over an elastic half space. The main goal of the present work is to introduce a closed form solution for calculating elastic settlement of ring foundations. The settlement calculation of a ring footing is achievable by definition of displacement influence factors, which is commonly used in the domain of elasticity theory. The influence factors obtained in this study address the ring geometry, footing stiffness, footing embedment, and the soil non-homogeneity by which it is assumed that the soil elastic modulus increases linearly with depth. Computational results are presented in the form of graphs and correspondent mathematical expressions are proposed for the influence factors, for use in practical applications in the analysis and design of ring footings. The results are also compared with the published numerical and analytical data for the influence factors of circular footings as a benchmark verification. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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21. Extracting some soil parameters and estimating elastic settlements from Direct shear box data for a granular C- Ø soil
- Author
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Ilori, Abidemi Olujide
- Published
- 2019
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22. Nomographs for predicting allowable bearing capacity and elastic settlement of shallow foundation on granular soil
- Author
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Omar, Maher, Shanableh, Abdallah, Hamad, Khaled, Tahmaz, Ali, Arab, Mohamed G., and Al-Sadoon, Zaid
- Published
- 2019
- Full Text
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23. Evaluation of the settlement influence factors of shallow foundation by numerical analyses.
- Author
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Enkhtur, Odgerel, Nguyen, Tien, Kim, Jin, and Kim, Sung
- Abstract
Several empirical and analytical methods have been proposed to estimate the elastic settlement of shallow foundations based on the elastic continuum theory. Previous methods have been generally proposed for circular foundations, its approach of using equivalent diameter was found less reliable for foundations of aspect ratio L/B > 2. This paper presents a three-dimensional numerical analysis to extend and improve the applicability of settlement influence and correction factors for shallow foundations of large aspect ratios. First, a methodical optimization and verification program was conducted to determine and verify a reliable model for numerical analysis. Using the verified model, two new sets of settlement influence factor and correction factor for foundation roughness of circular and rectangular foundations were then derived and proposed. A correction factor chart for the foundation rigidity of rectangular foundations was also proposed. Finally, the applicability of the proposed factors in this study was verified by comparing calculated settlements using the proposed factors along with the measured values from two raft foundations. The proposed approach was indicated to be a better alternative for foundations of L/B > 2. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
24. Homogenization of geomaterials containing voids by random fields and finite elements
- Author
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Griffiths, D.V., Paiboon, Jumpol, Huang, Jinsong, and Fenton, Gordon A.
- Subjects
- *
ASYMPTOTIC homogenization , *RANDOM fields , *FINITE element method , *POROSITY , *ELASTICITY , *STIFFNESS (Mechanics) - Abstract
Abstract: The paper describes the use of random fields and finite elements to assess the influence of porosity and void size on the effective elastic stiffness of geomaterials. A finite element model is developed involving “tied freedoms” that allows analysis of an ideal block of materials leading to direct evaluation of the effective Young’s modulus and Poisson’s ratio. The influence of block size and representative volume elements (RVE) are discussed. The use of random fields and Monte-Carlo simulations deliver a mean and standard deviation of the elastic parameters that lead naturally to a probabilistic interpretation. The methodology is extended to a foundation problem involving a footing on an elastic foundation containing voids. The approach enables estimates to be made of the probability of excessive settlement. [Copyright &y& Elsevier]
- Published
- 2012
- Full Text
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25. An approximate spreadsheet integration method for foundation settlements in two-layered medium.
- Author
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Dhar, Ashutosh Sutra and Tarefder, Rafiqul A.
- Subjects
SOIL testing ,FINITE element method ,BUILDING foundations ,STRAINS & stresses (Mechanics) ,ELASTICITY - Abstract
Traditional method of calculating foundation settlement in layered soil medium using Boussinesq solution for stresses and using elastic properties of the layers over-estimates the settlements. A simple spreadsheet integration method is proposed here to rationally calculate the elastic settlements of shallow foundations in layered medium. Two layer systems with finite stiffer layers overlying a semi-infinite softer layer are considered. Stresses in the layered system are calculated by combining Boussinesq theory with concept of "equivalent depth" to account for the stress redistribution. In this method, vertical strains at mid-layers are determined using soil elastic constitutive relations. Next, the strains are integrated over the layer depths to determine layer settlements. For validation, soil stresses and foundation settlements of the proposed method are compared to those from finite element analyses. The comparison reveals that the proposed method is reasonably accurate and suitable for design engineers to calculate settlements in layered medium. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
26. Developments in elastic settlement estimation procedures for shallow foundations on granular soil.
- Author
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Shin, Eun and Das, Braja
- Abstract
Developments in major procedures available in the literature relating to elastic settlement of shallow foundations supported by granular soil are presented and compared. The discrepancies between the observed and the predicted settlement are primarily due to the inability to estimate the modulus of elasticity of soil using the results of the standard penetration tests and/or cone penetration tests. Based on the procedures available at this time, recommendations have been made for the best estimation of settlement of foundations. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
27. Semi-empirical model for the prediction of modulus of elasticity for unsaturated soils.
- Author
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Won Taek Oh, Vanapalli, Sai K., and Puppala, Anand J.
- Subjects
- *
SANDY soils , *STRENGTH of materials , *MODULI theory , *SOIL moisture , *ARABLE land - Abstract
A semi-empirical model is proposed in this paper to predict the variation of modulus of elasticity with respect to matric suction for unsaturated sandy soils using the soil-water characteristic curve (SWCC) and the modulus of elasticity under saturated conditions. Using this model, comparisons are provided between the predicted and measured moduli of elasticity and elastic settlements from model footing test results on three different sandy soils. The results of this study are encouraging as there is good agreement between the predicted and measured moduli of elasticity and settlements. [ABSTRACT FROM AUTHOR]
- Published
- 2009
- Full Text
- View/download PDF
28. Evaluation of bearing capacity and settlement of foundations
- Author
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Bunyamin Anigilaje SALAHUDEEN and Ja'afar Abubakar SADEEQ
- Subjects
Bearing capacity ,Finite element method ,Numerical modelling ,Elastic settlement ,lcsh:Electronic computers. Computer science ,Standard Penetration Test ,lcsh:QA75.5-76.95 ,Plaxis 2D - Abstract
The standard penetration test (SPT) results (SPT N-values) used in this study were corrected to the standard average energy of 60% (N60) before using them to correlate soil properties and evaluate foundation settlement characteristics and bearing capacity in the North Central zone of Nigeria. Based on the corrected N-values, some geotechnical design parameters including the allowable bearing pressure and elastic settlement of foundations were predicted at varying applied foundation pressures of 50, 100, 200, 300 and 500 kN/m2 using conventional analytical models and numerical modelling. The numerical analysis results using Plaxis 2D, a finite element code, shows that Meyerhof’s and Peck’s et al. analytical/empirical methods of estimating the allowable bearing pressure of shallow foundations provide acceptable results. Results obtained show that an average bearing capacity value of 150 – 350 kN/m2 can be used for shallow foundations at embedment depth of 0.6 to 3.6 m in the North Central zone. Based on recommendation of Eurocode 7 which allows a maximum total settlement of 25 mm for serviceability limit state, it is recommended that raft or deep foundations to be considered for applied foundation pressures exceeding 300 kN/m2 in the North-Central zone to avoid excessive settlement.
- Published
- 2016
29. Developing artificial neural network models to predict allowable bearing capacity and elastic settlement of shallow foundation in Sharjah, United Arab Emirates
- Author
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Omar, Maher, Hamad, Khaled, Al Suwaidi, Mey, and Shanableh, Abdallah
- Published
- 2018
- Full Text
- View/download PDF
30. Kazıkların taşıma gücü ve oturma parametrelerinin incelenmesi, taşıma gücü için yeni bir metot önerisi
- Author
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Kabaca, Halil, Doktor Öğretim Üyesi İsa Vural, Sakarya Üniversitesi, Fen Bilimleri Enstitüsü, İnşaat Mühendisliği Anabilim Dalı, Geoteknik Bilim Dalı, Vural, İsa, and İnşaat Mühendisliği Anabilim Dalı
- Subjects
kazık oturması ,Elastic settlement ,Higher order finite elements ,Pile bearing capacity ,İnşaat Mühendisliği ,Civil Engineering ,Driven pile ,Single pile ,Concrete piles ,Pile load test ,Pile failure load ,Kazık yükleme deneyi ,kazık taşıma gücü ,Bored pile ,Piles - Abstract
06.03.2018 tarihli ve 30352 sayılı Resmi Gazetede yayımlanan “Yükseköğretim Kanunu İle Bazı Kanun Ve Kanun Hükmünde Kararnamelerde Değişiklik Yapılması Hakkında Kanun” ile 18.06.2018 tarihli “Lisansüstü Tezlerin Elektronik Ortamda Toplanması, Düzenlenmesi ve Erişime Açılmasına İlişkin Yönerge” gereğince tam metin erişime açılmıştır. Bu çalışmada, öncelikle, kazıkların taşıma gücü, kazıkların oturması, kazık yükleme deneyleri ve kazık yükleme deneylerini değerlendirme yöntemleri hakkında literatür taraması yapılmıştır. Yapılan literatür taraması sonucunda kazık taşıma gücünü belirlemek için bir çok araştırmacı tarafından zemin/kaya ortamının mekanik özelliklerini kullanan ve arazi deneyleri sonuçlarından direkt olarak taşıma gücüne geçilen teorik/ampirik yöntemler geliştirildiği görülmüştür. Kazık yükleme deneyi değerlendirme yöntemlerinde ise matematiksel yöntemler ve grafik yöntemler incelenmiştir. Literatür taraması sonucunda tespit edilen kazık taşıma gücü ve kazık oturmalarını belirlemek için kullanılan teorik/ampirik yöntemler ve kazık yükleme deneyi değerlendirme yöntemlerine sonlu eleman yöntemi de ilave edilmiş, tüm bu yöntemlerle bu çalışma kapsamında kullanılan sekiz adet kazık yükleme deneyinin kazık taşıma gücü ve oturma değerleri tahlil edilmiştir. Yapılan çözümlemeler sonucunda kazık oturmaları ve kazık nihai taşıma güçleri karşılaştırmalı olarak sunulmuştur. Matematiksel modele dayalı kazık yükleme deneyi değerlendirme yöntemleri irdelenmiş, mevcut yöntemlerin aşırı taşıma gücü verebileceği sonucuna varılmış ve yeni bir matematiksel modele dayalı kazık yükleme deneyi değerlendirme yöntemi önerilmiştir. Önerilen matematiksel modele dayalı kazık yükleme deneyi değerlendirme yönteminin, literatürde kabul gören diğer yöntemlerle karşılaştırmalı istatistiksel çözümlemeleri yapılmış ve kullanılabilir olduğu sonucuna varılmıştır. Literatürde kabul gören matematiksel yöntemlerden Decourt yöntemi önerilen yöntemin 1,59 katı, Chin-Kondner yöntemi önerilen yöntemin 1,57 katı, Özkan-Alku yöntemi ise önerilen yöntemin 1,17 katı göçme yükü değerleri vermiştir. In this study, firstly literature review was done about the bearing capacity of piles, pile settlement, pile loading tests and methods for evaluating pile loading tests. As a result of the literature search, it has been seen that many researchers have developed theoretical/empirical methods that use the mechanical properties of the soil/rock environment and extract the bearing capacity directly from the results of the field experiments. Mathematical methods and graphical methods are investigated as pile loading test evaluation methods. The finite element method have been added to the results of the literature review both pile loading test evaluation methods and the theoretical/empirical methods which are used to determine the pile bearing capacity and pile settlements. The bearing capacity and settlement of eight pile loading tests were analyzed with all these methods. As a result of the analysis, pile settlements and pile bearing capacities are presented comparatively. The pile load test evaluation methods based on mathematical models were examined and it was concluded that existing methods could give excessive bearing capacity value. Therefore new pile loading test evaluating method based on mathematical model was recommended. The recommended pile loading test evaluating method based on mathematical model were Compared with other methods accepted in the literature by statistical analysis and proved to be usable. Comparing the results of the recommended method to some of the mathematical methods accepted in the literature the Decourt method is 1,59, the Chin-Kondner method is 1,57 and the Özkan-Alku method is 1,17 times bigger than the recommended method.
- Published
- 2018
31. Elastic Settlement Analysis of Rigid Rectangular Footings on Sands and Clays.
- Author
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Pantelidis, Lysandros and Gravanis, Elias
- Subjects
ELASTIC analysis (Engineering) ,POISSON'S ratio ,SAND ,YOUNG'S modulus ,CLAY ,BEARING capacity of soils - Abstract
In this paper an elastic settlement analysis method for rigid rectangular footings applicable to both clays and sands is proposed. The proposed method is based on the concept of equivalent shape, where any rectangular footing is suitably replaced by a footing of elliptical shape; the conditions of equal area and equal perimeter are satisfied simultaneously. The case of clay is differentiated from the case of sand using different contact pressure distribution, whilst, additionally, for the sands, the modulus of elasticity increases linearly with depth. The method can conveniently be calibrated against any set of settlement data obtained analytically, experimentally, or numerically; in this respect the authors used values which have been derived analytically from third parties. Among the most interesting findings is that sands produce "settlement x soil modulus/applied pressure" values approximately 10% greater than the respective ones corresponding to clays. Moreover, for large Poisson's ratio (v) values, the settlement of rigid footings is closer to the settlement corresponding to the corner of the respective flexible footings. As v decreases, the derived settlement of the rigid footing approaches the settlement value corresponding to the characteristic point of the respective flexible footing. Finally, corrections for the net applied pressure, footing rigidity, and non-elastic response of soil under loading are also proposed. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
32. Estimating the Elastic Settlement of Vertically Loaded Single Piles in Rock
- Author
-
Abdalfatah A. Shehada and Hisham T. Eid
- Subjects
Engineering ,Elastic settlement ,Settlement (structural) ,business.industry ,Science and engineering ,General Engineering ,Axial loading ,Forensic engineering ,Rock stiffness ,Pile settlement ,business ,Pile ,Piled rafts ,Piles ,Research center - Abstract
An extensive finite element analysis was performed to study the settlement behavior of vertically loaded piles entirely embedded in non-homogeneous rock. To avoid utilizing interrelated parameters, pile-rock relative stiffness was expressed as a function of the elastic modulus of rock mass near the pile head that does not depend on pile length. Cases of pile-rock stiffness ratios that are typical for reinforced concrete piles bored in sedimentary rocks were investigated. Charts were developed to predict the elastic settlement of vertically loaded piles in non-homogeneous media. An equation was also introduced to incorporate the effect of rock non-homogeneity in estimating the depth at which settlement becomes insensitive to the increase of pile length. Asia Civil Engineering Association,International Association for Scientific and High Technology,International Science and Engineering Research Center Scopus
- Published
- 2013
- Full Text
- View/download PDF
33. Numerical investigation of novel prefabricated hollow concrete blocks for stepped-type seawall structures.
- Author
-
Dang, Bao-Loi, Nguyen-Ngoc, Hau, Hoang, Thao Duc, Nguyen-Xuan, H., and Abdel Wahab, Magd
- Subjects
- *
CONCRETE blocks , *SETTLEMENT of structures , *SOIL-structure interaction , *BEARING capacity of soils , *ELASTIC foundations , *OCEAN waves , *INTEGRATED coastal zone management - Abstract
• Three dimensional (3D) numerical model for seawall structures is developed. • Load-bearing capacity of hollow block and the stability of seawall structures. • Soil-structure interaction between blocks and soil is taken into account in the numerical model. • Elastic settlement of foundation is evaluated and can be considered for design of coastal structures. In this paper, a novel Three-Dimensional (3D) prefabricated Hollow Concrete Block (HCB), which can form seawall structures, is numerically investigated. Unlike the traditional gravity-type seawalls, this is a lightweight structure in comparison with the conventional ones, but it possesses advantageous features under complex loading conditions. The load bearing capacity of HCB itself under the wave loading has been examined. The highly complicated soil-structure interaction is taken into account so that the underlying simulation may predict realistic behaviors of seawall structures. The results indicate that this novel seawall model requires fewer concrete materials, but is adequate under sea wave attacks. For instance, stresses induced on seawall blocks are smaller than the allowed stresses of concrete. By adding sand into the HCB components to increase its weight and using supported-piles system, the stability of the seawall structure is enhanced and its settlement is reduced. The results obtained are evaluated using reference studies, from literature, regarding the elastic settlement of foundation. The techniques proposed in this paper, therefore, may provide an important pathway for further studies aiming to achieve optimal and reliable coastal designs taking into account the impacts of climate change. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
34. Analysis of Spread Footing Foundations as a Highway Bridge Alternative
- Author
-
Meranda, Jill L.
- Subjects
- Engineering, Civil, Shallow Foundations, Highway Bridges, Spread Footings, Elastic Settlement
- Abstract
Spread footings have been utilized to support various types of civil engineering structures over the years. However, they have not seen much use in Ohio for highway bridge applications. Despite the success of previous spread footing studies, more research is needed to evaluate spread footings as a highway bridge foundation. Research is performed to determine a correlation between the contact pressure, settlement, and tilting of the footing. A correlation is found between settlement and tilting as they demonstrate global behaviors, unlike contact pressure, which reflects the stiffness of the underlying soil in localized areas. Methods from AASHTO LRFD Bridge Design Specifications (2004) and other researchers are evaluated and the Hough, Schmertmann, Burland-Burbidge, and Terzaghi-Peck methods are determined to be the most reliable. A cost analysis is performed to determine the effectiveness of using spread footings. Installing a typical spread footing may save nearly 63% as compared to pile foundations.
- Published
- 2005
35. Elastic settlement of ring foundations
- Author
-
Mojtaba Naseri and Ehsan Seyedi Hosseininia
- Subjects
Displacement influence factors ,Ring (mathematics) ,Embedment ,Settlement (structural) ,business.industry ,Elastic settlement ,Finite difference method ,Order (ring theory) ,Stiffness ,Structural engineering ,Geotechnical Engineering and Engineering Geology ,Domain (ring theory) ,Numerical modeling ,medicine ,medicine.symptom ,business ,Elastic modulus ,Ring foundation ,Civil and Structural Engineering ,Mathematics - Abstract
In this paper, numerical computations using the finite difference method are carried out in order to investigate the settlement of ring foundations resting over an elastic half space. The main goal of the present work is to introduce a closed form solution for calculating elastic settlement of ring foundations. The settlement calculation of a ring footing is achievable by definition of displacement influence factors, which is commonly used in the domain of elasticity theory. The influence factors obtained in this study address the ring geometry, footing stiffness, footing embedment, and the soil non-homogeneity by which it is assumed that the soil elastic modulus increases linearly with depth. Computational results are presented in the form of graphs and correspondent mathematical expressions are proposed for the influence factors, for use in practical applications in the analysis and design of ring footings. The results are also compared with the published numerical and analytical data for the influence factors of circular footings as a benchmark verification.
- Full Text
- View/download PDF
36. Evaluation of pile bearing capacity and settlement by load tests
- Author
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Bircan, Berat Tüzin, Özkan, M. Yener, and Diğer
- Subjects
Franki pile ,Pile load test ,Elastic settlement ,Pile bearing capacity ,Bored pile ,İnşaat Mühendisliği ,Civil Engineering - Abstract
147
- Published
- 1989
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