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Your search keyword '"Briseghella, B."' showing total 83 results
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83 results on '"Briseghella, B."'

33. Probabilistic seismic response and uncertainty analysis of continuous bridges under near-fault ground motions

Author

Ma H. -B., Zhuo W. -D., Lavorato D., Nuti C., Fiorentino G., Gu Y., Briseghella B., Ma, H. -B., Zhuo, W. -D., Lavorato, D., Nuti, C., Fiorentino, G., Gu, Y., and Briseghella, B.

Subjects
Orthogonal experimental design, Seismic demand model, Continuous bridge, Intensify measure, Near fault, Physics::Geophysics
Abstract

This paper focuses on the pulse-like near-fault ground motion, developing a probabilistic seismic demand model to estimate the seismic response of regular continuous bridges. A three-span bridge with continuous deck is taken as the basic case to establish 25 representative samples by changing the geometrical parameters and modeled with OpenSees software. The ground motions of both near fault and far fault are selected from PEER NGA strong ground motion database. The seismic response of the bridge is evaluated using the drift ratio at the top of the pier. A series of nonlinear dynamic time history analysis is carried out to compare the damage obtained with near-fault and far-fault ground motions for three different site conditions. Subsequently, a sensitivity analysis is performed on the design parameters according to the orthogonal experimental design methodology. After selecting the Housner intensity as the most suitable intensity measure and drift ratio as the engineering demand parameter, the probabilistic seismic demand model is established for the near-fault earthquake on the site II condition which is classified by Chinese design code. The results show that the near-fault earthquake can lead to more serious damage with respect to regular bridges and that the probabilistic seismic demand model allows for a quick evaluation of the seismic behavior of regular continuous bridges under pulse-like near-fault earthquake.

Published
2019

38. Seismic damaged Chinese rc bridges repaired and retrofitted by rapid intervention to improve plastic dissipation and shear strength

Author

LAVORATO, DAVIDE, BERGAMI, ALESSANDRO VITTORIO, NUTI, CAMILLO, Briseghella, B., Tarantino, A.m., SANTINI, SILVIA, Huang, Y., Xue, J., LAVORATO D., BERGAMI, AV., NUTI, C., BRISEGHELLA, B., TARANTINO, AM., SANTINI, S., HUANG, Y., XUE, J., Lavorato, Davide, Bergami, ALESSANDRO VITTORIO, Nuti, Camillo, Briseghella, B., Tarantino, A. m., Santini, Silvia, Huang, Y., and Xue, J.

Published
2016

40. New Solutions for Rapid Repair and Retrofit of RC Bridge Piers

Author

LAVORATO, DAVIDE, Wu, J., Huang, Y., Xue, J., BERGAMI, ALESSANDRO VITTORIO, NUTI, CAMILLO, Briseghella, B., Tarantino, A. M., SANTINI, SILVIA, CINPAR, Lavorato, Davide, Wu, J., Huang, Y., Xue, J., Bergami, ALESSANDRO VITTORIO, Nuti, Camillo, Briseghella, B., Tarantino, A. M., and Santini, Silvia

Published
2016

41. Seismic Analysis by Macroelements of Fujian Hakka Tulous, Chinese Circular Earth Constructions Listed in the UNESCO World Heritage List.

Author

Briseghella, B., Colasanti, V., Fenu, L., Nuti, C., Spacone, E., and Varum, H.

Subjects
SEISMIC response, NONLINEAR analysis, DEGREES of freedom, FAILURE mode & effects analysis, MASONRY, CHINESE people
Abstract

The overall seismic response of Hakka Tulous, massive traditional earth constructions located in the Fujian Province (China) and part of the UNESCO list of World Heritage buildings, is investigated. For this aim, non-linear static analysis (pushover) was used. Since Tulous are complex circular earth structures (about 50 m in diameter) stiffened by wooden frames along the whole inner perimeter of the circular earth wall, non-linear finite element models are hard to implement because convergence is difficult to achieve and very long computation time would be required given the large number of elements and degrees of freedom. For the above reasons, the equivalent frame approach is often used for masonry structures. Even if a few approximations are needed, non-linear static analysis of even very complex masonry structures can be successfully performed with fewer convergence problems and lower computational efforts. The seismic analysis of a representative circular Tulou is carried out. An extension to circular masonry structures of the analysis by macroelements through the equivalent frame method is hence studied. The results provides insight on the Tulou's failure modes and on its overall seismic response. Since this is the first study on the overall seismic response of these complex earth constructions, further research is needed to deepen our knowledge of their structural behaviour. [ABSTRACT FROM AUTHOR]

Published
2020
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43. RAPID REPAIR SOLUTION FOR CHINESE RC BRIDGES TO IMPROVE PLASTIC DISSIPATION, DUCTILITY AND SHEAR STRENGTH ACCORDING CAPACITY DESIGN CRITERIA

Author

LAVORATO D, BRISEGHELLA B, ZHOU Z, XUE J., NUTI, CAMILLO, SANTINI, SILVIA, Caner, Alp, Gülkan, Polat, Mahmoud, Khaled, Lavorato, D, Nuti, Camillo, Santini, Silvia, Briseghella, B, Zhou, Z, and Xue, J.

Subjects
C-FRP, Bridge, capacity design [Seismic retrofitting]
Abstract

A rapid repair and seismic upgrade solution for reinforced concrete (rc) bridges designed according to Chinese code (JTG D60-2004 [1], JTG D62-2004 [2] and JTG/T B02-01-2008 [3]) but with insufficient transversal steel reinforcement, damaged by a strong earthquake, is proposed and tested. This solution is an upgrade of the one tested with very good results during a previous research (Lavorato et al. [4]) on bridge designed according to old Italian code (‘86) [5] without proper seismic details. In particular some improvements are given for damaged rebar substitution. Cyclic tests are carried out on pier specimens (in scale 1:6) of the most stressed pier of the Chinese rc bridge at Fuzhou University lab (China) to evaluate the effectiveness of the proposed repair technique. These specimens have been built simulating the substitution of the damaged portions of the rebars using rebar turned at the pier base to have a smaller diameter. The turned rebar ensures the concentration of the plasticity at the base of the pier. A C-FRP wrapping is applied to increase the insufficient shear strength and guarantee the necessary ductility in the plastic hinge sections. Different turned rebar configurations are considered to optimize the intervention.

Published
2014

44. A probabilistic evaluation of an integral abutment bridge

Author

Munoz, M., Briseghella, B., junqing xue, Smaldini, P., Nuti, C., Munoz, Miguel, Briseghella, Bruno, Xue, Junqing, Smaldini, Pasquale, and Nuti, Camillo

Subjects
Safety, Risk, Reliability and Quality, Civil and Structural Engineering
Abstract

In last years, a new trend in the construction of short and medium span bridges has raised in some countries. The solution of an Integral Abutment Bridge (IAB), when possible to do, reduces the cost of construction and maintenance because expansion joints and bearings are not necessary. With the development of reliability approach, it is possible to develop a probabilistic analysis of a structure to study the behavior of the bridge in a more realistic way. A big effort has done in the present years to realize different reliability studies on bridges, but only focused on gravitational loads, without paying much attention to temperature, creep, shrinkage and the interaction of the soil and the structure by the stiffness of the soil around the infrastructure. This work will develop the state of art on literature for the study of this kind of variables in a probabilistic analysis of IAB.

Published
2016

47. Influence of Brick Masonry Infill Walls on Seismic Response of RC Structures.

Author

Khan, N. A., Tahir, M. F., Nuti, C., Briseghella, B., and Bergami, A. V.

Subjects
SEISMIC response, MASONRY, FINITE element method, EARTHQUAKE zones, CONSTRUCTION laws, REINFORCED concrete
Abstract

Finite element modelling and analysis of three bays three stories, two-dimensional reinforced concrete (RC) frame were performed to evaluate the seismic performance of structures with infill masonry assuming the structure to be constructed in the seismic zone 3, according to the building code of Pakistan. Two types of Masonry RC frames were modelled, first with full infill walls (FIF) and secondly with a soft story (SSF) at ground floor. Subsequently, the analytical results were compared with that of the performance of the bare frame (BF) model, considered as reference. FEMA and ATC 40 guidelines were used to include the effect of masonry walls. The overall performance of all three models were evaluated in terms of the fundamental modal time period, maximum inter-story drift ratio (MIDR), relative displacement (RD), stiffness, and performance points as per ATC 40 capacity spectrum method. The study confirmed that the structural performance of full masonry infill walls frame model (FIF) was better than the other two. The study also revealed that the single strut model was unable to capture the real behaviour of the infill wall in RC structures, favouring the use of multi diagonal struts macro modelling techniques. [ABSTRACT FROM AUTHOR]

Published
2019

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