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Computational modelling of hysteresis and damage in reinforced concrete bridge columns subject to seismic loading. / Mohamed R. Omar Benamer

Swansea University Author: Mohamed R. Omar Benamer

Abstract

Box-girder bridges supported by single reinforced concrete (RC) columns are expected to sustain seismic shocks with minor structural damages in seismically active regions where transportation is substantially required for rescuing and evacuating tasks. Such viaducts are vulnerable to damage when the...

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Published: 2013
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42309
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spelling 2018-08-29T16:12:13.8518464 v2 42309 2018-08-02 Computational modelling of hysteresis and damage in reinforced concrete bridge columns subject to seismic loading. df0b42107f9d21e84310e7d5e2f9d2e5 NULL Mohamed R. Omar Benamer Mohamed R. Omar Benamer true true 2018-08-02 Box-girder bridges supported by single reinforced concrete (RC) columns are expected to sustain seismic shocks with minor structural damages in seismically active regions where transportation is substantially required for rescuing and evacuating tasks. Such viaducts are vulnerable to damage when they are subjected to strong ground motions and acceleration pulse records, especially when responding in a flexural mode or having relatively low core confinement. Using a nonlinear dynamic solver that applies the fibre element method, global and local damage curves are computed based on the dissipated energy under hysteretic curves and based on constitutive curves, respectively. The RC bridge with seismic isolation bearing is used as an alternative system to control the damage, and modelled using linkage elements between the substructure and super structure. It was found that seismic isolation can be controlled to dissipate partial seismic energy so that the RC column gains the least possible minor damage. Using a MatLab program, a fibre element nonlinear model was built using a simplified iterative process and simplified constitutive relations. The number of fibres and elements under the dynamic loading was found to be affecting the final results of the analysis. Using crack growth modelling based on fracture mechanics, the combined discrete element/finite element explicit-Elfen code was applied to investigate the crack growth in 3D dynamically loaded RC columns. Despite its excessive computational cost and time, this code provides reliable information about local damage in the RC column core. Earthquake records with the pulse acceleration phenomenon have a severe damage potential on the structure. The difference in damage intensities was detected by crack growth modelling for the same problem using different loading rates. Critically stressed zones can be investigated independently by using the relative response technique, in which responses from the numerically analysed structure are re-used as applied loads onto a small-scale crack model for the critical member. Two general conclusions can be obtained; bridges with single RC columns designed by the demand/capacity criterion could suffer severe damage and possible collapse when subjected to strong ground motions. Secondly; hysteresis-based methods provide a global damage evaluation based on strength and ductility only regardless of the damage growth inside the concrete core and the buckling of bars, which could lead to progressive collapse. E-Thesis Civil engineering. 31 12 2013 2013-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-29T16:12:13.8518464 2018-08-02T16:24:28.7761897 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Mohamed R. Omar Benamer NULL 1 0042309-02082018162444.pdf 10798017.pdf 2018-08-02T16:24:44.3300000 Output 29483132 application/pdf E-Thesis true 2018-08-02T16:24:44.3300000 false
title Computational modelling of hysteresis and damage in reinforced concrete bridge columns subject to seismic loading.
spellingShingle Computational modelling of hysteresis and damage in reinforced concrete bridge columns subject to seismic loading.
Mohamed R. Omar Benamer
title_short Computational modelling of hysteresis and damage in reinforced concrete bridge columns subject to seismic loading.
title_full Computational modelling of hysteresis and damage in reinforced concrete bridge columns subject to seismic loading.
title_fullStr Computational modelling of hysteresis and damage in reinforced concrete bridge columns subject to seismic loading.
title_full_unstemmed Computational modelling of hysteresis and damage in reinforced concrete bridge columns subject to seismic loading.
title_sort Computational modelling of hysteresis and damage in reinforced concrete bridge columns subject to seismic loading.
author_id_str_mv df0b42107f9d21e84310e7d5e2f9d2e5
author_id_fullname_str_mv df0b42107f9d21e84310e7d5e2f9d2e5_***_Mohamed R. Omar Benamer
author Mohamed R. Omar Benamer
author2 Mohamed R. Omar Benamer
format E-Thesis
publishDate 2013
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description Box-girder bridges supported by single reinforced concrete (RC) columns are expected to sustain seismic shocks with minor structural damages in seismically active regions where transportation is substantially required for rescuing and evacuating tasks. Such viaducts are vulnerable to damage when they are subjected to strong ground motions and acceleration pulse records, especially when responding in a flexural mode or having relatively low core confinement. Using a nonlinear dynamic solver that applies the fibre element method, global and local damage curves are computed based on the dissipated energy under hysteretic curves and based on constitutive curves, respectively. The RC bridge with seismic isolation bearing is used as an alternative system to control the damage, and modelled using linkage elements between the substructure and super structure. It was found that seismic isolation can be controlled to dissipate partial seismic energy so that the RC column gains the least possible minor damage. Using a MatLab program, a fibre element nonlinear model was built using a simplified iterative process and simplified constitutive relations. The number of fibres and elements under the dynamic loading was found to be affecting the final results of the analysis. Using crack growth modelling based on fracture mechanics, the combined discrete element/finite element explicit-Elfen code was applied to investigate the crack growth in 3D dynamically loaded RC columns. Despite its excessive computational cost and time, this code provides reliable information about local damage in the RC column core. Earthquake records with the pulse acceleration phenomenon have a severe damage potential on the structure. The difference in damage intensities was detected by crack growth modelling for the same problem using different loading rates. Critically stressed zones can be investigated independently by using the relative response technique, in which responses from the numerically analysed structure are re-used as applied loads onto a small-scale crack model for the critical member. Two general conclusions can be obtained; bridges with single RC columns designed by the demand/capacity criterion could suffer severe damage and possible collapse when subjected to strong ground motions. Secondly; hysteresis-based methods provide a global damage evaluation based on strength and ductility only regardless of the damage growth inside the concrete core and the buckling of bars, which could lead to progressive collapse.
published_date 2013-12-31T03:52:43Z
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score 11.013799

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