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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Lifetime seismic performance assessment on post-tensioned self-centering concrete frames considering long-term prestress loss
Highlights Prestress loss in PTSC frames is estimated. Time-dependent FE model for PTSC frame is developed. Time-variant fragility curves are derived for each floor of PTSC frames.
Abstract Prestressing force acts as the main provider of the moment resistance and self-centering capacity of post-tensioned self-centering (PTSC) concrete frames. As the constantly compressed members are subjected to long-term deformations induced by the shrinkage and creep of concrete, the prestress loss would inevitably arise in PTSC frames. This study presents a comprehensive approach to assess the long-term seismic performance of PTSC concrete frames, in which the prestress loss is estimated and considered as the major degradation effect. Time-dependent fragility functions are derived for each floor to detect the variations in the story performance and damage distribution of the structure. The proposed approach is applied to two PTSC concrete frames with and without appendant energy dissipators, respectively. Results indicate that the prestress loss imposes greater impact on the higher floors, and would change the position of the most vulnerable story. Moreover, the frame without energy dissipators suffers larger performance degradation as compared to the damped building.
Lifetime seismic performance assessment on post-tensioned self-centering concrete frames considering long-term prestress loss
Highlights Prestress loss in PTSC frames is estimated. Time-dependent FE model for PTSC frame is developed. Time-variant fragility curves are derived for each floor of PTSC frames.
Abstract Prestressing force acts as the main provider of the moment resistance and self-centering capacity of post-tensioned self-centering (PTSC) concrete frames. As the constantly compressed members are subjected to long-term deformations induced by the shrinkage and creep of concrete, the prestress loss would inevitably arise in PTSC frames. This study presents a comprehensive approach to assess the long-term seismic performance of PTSC concrete frames, in which the prestress loss is estimated and considered as the major degradation effect. Time-dependent fragility functions are derived for each floor to detect the variations in the story performance and damage distribution of the structure. The proposed approach is applied to two PTSC concrete frames with and without appendant energy dissipators, respectively. Results indicate that the prestress loss imposes greater impact on the higher floors, and would change the position of the most vulnerable story. Moreover, the frame without energy dissipators suffers larger performance degradation as compared to the damped building.
Lifetime seismic performance assessment on post-tensioned self-centering concrete frames considering long-term prestress loss
Li, Lu-Xi (Autor:in) / Li, Chao (Autor:in) / Li, Hong-Nan (Autor:in) / Hao, Hong (Autor:in)
Engineering Structures ; 262
23.04.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Seismic design procedure and seismic response of post-tensioned self-centering steel frames
| Online Contents | 2009