10 results on '"Jonaidi, Mohammad"'
Search Results
2. Innovative Approaches and Challenges in the Demolition of Large-Span Post-Tensioned Beams: Insights from a Case Study.
- Author
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Jonaidi, Mohammad, Kaplan, Adam, and Keyvanfar, Ali
- Subjects
DEMOLITION ,GROUND penetrating radar ,STRUCTURAL models ,TENDONS ,POST-tensioned prestressed concrete ,COMPUTER simulation - Abstract
Large-span, post-tensioned (PT) beams play a crucial role in maximizing the benefits of post-tensioning techniques. Bonded and unbonded systems are prevalent, with the latter being more widespread in the United States. While bonded systems are advantageous for creating long spans when multiple tendons are grouped in ducts, limited studies in the literature exist on their demolition. With a case study, this paper addresses the unique challenge of demolishing large-span-bonded, post-tensioned beams that occurs due to a building's functional change. Emphasizing insights for engineers, it explores the use of cutting and dismantling methods, thereby considering the presence of prestressed cables. The demolition process is distinctive due to the presence of numerous prestressed cables along the beams, necessitating a specialized and cautious cutting approach. This is accomplished through the use of a drilling technique that selectively distresses the tendons, ensuring they are not all affected simultaneously. An intriguing observation discussed in this paper pertains to the occurrence of horizontal cracks accompanied by loud sounds following the drilling process, thereby offering insights from the design perspective of PT systems. This paper details an innovative method for safely demolishing large-span, bonded PT beams using ground-penetrating radar and computer models to navigate structural complexities and ensure nearby structures' safety. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
3. Design and Evaluation of a New Composite Spine Support
- Author
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Williams, George, primary, Plowman, Timothy, additional, Jonaidi, Mohammad, additional, Kortobi, Salim, additional, and Nasseri, Simin, additional
- Published
- 2023
- Full Text
- View/download PDF
4. Design and evaluation of a new composite spine support
- Author
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Nasseri, Simin, primary, Jonaidi, Mohammad, additional, Kortobi, Salim, additional, Plowman, Timothy, additional, and Williams, George, additional
- Published
- 2023
- Full Text
- View/download PDF
5. Design, Finite Element Analysis and Fabrication of Composite Orthoses for Bunions; A Comprehensive Study
- Author
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Willis, Logan, primary, Kortobi, Salim, additional, Williams, George, additional, Jonaidi, Mohammad, additional, and Nasseri, Simin, additional
- Published
- 2023
- Full Text
- View/download PDF
6. Design, finite element analysis and fabrication of composite orthoses for bunions: a comprehensive study
- Author
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Nasseri, Simin, primary, Jonaidi, Mohammad, additional, Kortobi, Salim, additional, Williams, George, additional, and Willis, Logan, additional
- Published
- 2023
- Full Text
- View/download PDF
7. Innovative Industry-Related Research Projects for Civil Engineering Undergraduate Students.
- Author
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Jonaidi, Mohammad and Nasseri, Simin
- Subjects
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UNDERGRADUATES , *CIVIL engineering , *ENGINEERING students , *ENGINEERING education , *PUBLIC works - Abstract
This paper covers the important aspects of new research methodologies, including the methods and tools, for undergraduate students at a Civil Engineering program. It aims to improve the research competencies of civil engineering students through immersing the students in different types of research exercises. The activities have been exploratory, experimental and theoretical. The focus of the new approach is on developing soft skills, gaining practical and hands-on skills, research management and planning, and presenting the results in an optimum manner. Six undergraduate students from two departments were involved in various components of a research project related to the post-tensioned concrete structures. The core project started in a company specialized in post-tensioning industry. Initially, the learning objective was to gain a deep understanding of the mechanical properties of concrete and steel as well as the post-tensioning of the concrete slabs. However, the main objective was to get students involved in designing effective test platforms from scratch, to perform experiments with concrete blocks and a special compressible material used in industry. One of the goals was to investigate the friction coefficient of connection between the concrete slab and walls in Post-Tensioned construction. The research involved testing the resistance of concrete blocks against applied loads in variety of conditions. Furthermore, students were to explore the behavior of a compressible material that is used to wrap rebar, as a release detail, for slab and walls in Post-Tensioning construction. The goals were achieved by establishing a unique testing rig to apply lateral load to the poured concrete specimens that contained the foamwrapped steel dowel (rebar), which extended into a poured concrete slab. Consequent research projects have been conducted to construct a model of concrete-foam-rebar media and simulate it using the Finite Element Analysis with ABAQUS© package. The objective has been to refine the model and material characteristics, until a nonlinear analysis and simulation produces valid and comparable results to the laboratory prototype. Structured and neat research methods were tabulated to teach the students as how to conduct research in a more passionate, productive, and useful way. These were conducting the extensive literature review, establishing the complex test rigs, evaluating the sophisticated mesh configurations and performing non-linear analysis. The most important outcomes of the new research methods were; students' eagerness and enthusiasm to establish the test platforms, learning all the necessary hands-on skills despite obstacles and limitations, learning new simulation packages, and presenting in various conferences and symposiums in a professional way. The reflections provided by students demonstrated their extraordinary satisfaction of this life-long learning experience, and the importance of their gained skills in future graduate programs and/or high-level industry positions. [ABSTRACT FROM AUTHOR]
- Published
- 2022
8. Lean Practices in Academia; A Comprehensive Review and a New Provisional Model.
- Author
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Nasseri, Simin, Jonaidi, Mohammad, Esfahani, Navid Nasajpour, and Schultz, Ralph
- Subjects
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LEAN management , *HIGHER education , *SIX Sigma , *PROJECT management , *MANUFACTURING industries - Abstract
Lean manufacturing methods have been widely used in industry for many decades. The lean concepts which have been adopted, largely have increased profit and reduced waste. Lean philosophy has been reviewed in academia by researchers, but only few major models have been developed. In these models, various factors have been discussed without finding a common ground or core. The focus of this paper is to review the lean models in use in academia as well as to identify the most important pillars based on which a new model may be constructed. It then reviews some novel approaches which might help higher education professionals to focus on value creation, continuous improvement, as well as efficiency. The underlying lean principles in industry in various sectors are adopted to complete a list of deliverables to be used in academia. For this purpose, the three bodies of Faculty, Students and Staff are considered, as well as the three areas of Teaching, Research, and Service. Lean philosophy in each body and area is also evaluated. The core theoretical elements of lean manufacturing are the three main goals, the two fundamentals, the five principles, and the eight wastes. The new educational model is based on four pillars which are adopted from the primary elements of the Lean World Class Manufacturing (LWCM) and lean Six Sigma framework. However, the model also incorporates the elements of the future-ready manufacturing business, and project management. The emphasis is on reducing waste in engineering departments, which is the main goal of the new model suggested. These elements are revisited from the perspective of higher education management, to offer new methods that faculty and administration bodies can deploy for a much higher efficiency, effectiveness, and productivity in academia. These are to ensure higher rates of retention and graduation, and general student success. These new methods can be incorporated in university trainings for faculty and staff and be frequently evaluated for successful outcomes. [ABSTRACT FROM AUTHOR]
- Published
- 2022
9. Inelastic Response Spectrum for Foreshock-Mainshock-Aftershock Sequences.
- Author
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Bastami, Morteza and Jonaidi, Mohammad
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GROUND motion ,EARTHQUAKE resistant design ,EARTHQUAKE aftershocks ,SEISMIC waves ,NONLINEAR analysis ,NONLINEAR systems ,MOTION - Abstract
The effect of aftershocks on structures is not usually considered in seismic design codes. In addition to mainshock events, aftershocks can cause major damage to structures, especially to mainshock-damaged structures. Analysis of the characteristics of the mainshock, foreshocks, and aftershocks reveal differences in the ground motion parameters. Structures may undergo a variety of seismic waves with different characteristics that can increase the chance of seismic amplification. The present study examined the effects of aftershock as well as foreshocks events on the response of single degree-of-freedom (SDOF) systems with nonlinear behavior. This allowed inclusion of possible differences during calculation of the response spectrum for cases having foreshock and aftershock effects and those excluding these effects. To this end, 38 mainshocks from different seismic regions with moment magnitudes (Mw) greater than 3.5 were used. More than 168 records from mainshock, aftershock, and foreshock events were applied to evaluate the effects of aftershocks and foreshocks on the response spectrum. The parameters of post-yield stiffness ratio (hardening and softening), ductility factor, period, and site classification were taken into account during 121,000 nonlinear analyses on 60 SDOF models. The results show that the aftershocks as well as foreshocks have a significant effect on the response spectrum, increasing the structural response. Consequently, the effect of aftershocks must be considered in the development of design spectra in seismic codes and guidelines. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
10. Relationship between Taq1A Dopamine D2 Receptor Polymorphism and Motivation to Exercise and levels of Voluntary Physical Activity.
- Author
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Hojjati, Sedigheh Sadat, Rohani, Hadi, Gaeini, Abbas Ali, and jonaidi, Mohammad shariatzadeh
- Subjects
PHYSICAL activity ,GENETIC polymorphisms ,BODY weight ,YOUNG women ,GENOTYPES - Abstract
Aims: The purpose of this study was to examine the genetic basis underlying voluntary physical activity. This study explores to an association, if exists, between motivation to exercise, levels of voluntary physical activity and Taq1A gene polymorphisms. Method: 122 participants (age=24.4±5.7 yrs., 55 males & 67 females) completed the Behavioral Regulation in Exercise Questionnaire - 2 (BREQ-2) to assess their motivation to exercise and the International Physical Activity Questionnaire (IPAQ) to assess their level of physical activity. DNA was isolated from a cheek cell sample. The Taq1A genotype was identified using PCR with gene specific primers. Results: Our study included 85 normal-weight, 30 overweight, and 7 obese subjects. Three variants of DRD2 taq1A -CC (n=77, 63.1%), CT (n=35, 7.28%), and TT (n=10, 2.8%) - were identified. Internal motivation to exercise was significantly higher in the CC genotype compared to the other two genotypes (P=0.017). Conclusion: In general, intrinsic regulation factors of motivation, as well as the type of genotype, may play a major role in determining the level of physical activity. Taq1A polymorphism of the DRD2 gene is related to physical activity and body weight in young men and women. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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