原文传递
Enhanced Strategies for Seismic Resilient Posttensioned Reinforced Concrete Bridge Piers: Experimental Tests and Numerical Simulations
| 题名： | Enhanced Strategies for Seismic Resilient Posttensioned Reinforced Concrete Bridge Piers: Experimental Tests and Numerical Simulations |
| 正文语种： | eng |
| 作者： | Shen, Yu;Freddi, Fabio;Li, Yongxing;Li, Jianzhong |
| 作者单位： | Tongji Univ;UCL;China Railway Design Corp;Tongji Univ |
| 关键词： | Bridge piers;Unbonded posttensioning;Seismic performance;Enhanced resistance;Experimental testing;Numerical modeling |
| 摘要： | Recent studies have proposed and investigated the use of unbonded posttensioned (PT) bars in bridge substructure systems to improve their self-centering behavior. However, the lateral loading resistance and self-centering capacities of reinforced concrete (RC) piers with PT bars (i.e., the posttensioned RC bridge piers: PRC piers) could be easily compromised by early crushing of the base compression toe during a seismic event. Hence, in order to enhance the pier base integrity, the present study proposes and experimentally investigates three simple strategies for enhancing the seismic-damage resistance of PRC piers based on the use of (1) a steel tube to encase the PRC pier's end segment; (2) ultrahigh performance concrete at the PRC pier's end segment; and (3) engineered cementitious composite mortar bed underneath the pier bottom. The performance of these three PRC piers was assessed by comparing them with a conventional PRC pier under cyclic loading and considering the damage evolution and the cyclic force-displacement response. The comparison shows that the proposed enhanced PRC solutions allow improving the seismic performance of the system sustaining large lateral drifts with good self-centering behavior. Moreover, based on the test results, finite element models accounting for PT force loss and the rocking characteristics were validated to reproduce the piers' cyclic response, thus highlighting the importance of considering PT force loss during numerical simulations. |
| 出版年： | 2023 |
| 期刊名称： | Journal of structural engineering |
| 卷： | 149 |
| 期： | 3 |
| 页码： | 04022259.1-04022259.17 |
相关文献
- Cyclic Load Tests on Self-Centering Concrete Pier with External Dissipators and Enhanced Durability
- Seismic Resilience Upgrade of RC Frame Building Using Self-Centering Concrete Walls with Distributed Friction Devices
- Shake Table Studies and Analysis of a PT-UHPC Bridge Column with Pocket Connection
- PCI Journalannounces authors of award-winning papers for 2015
- Effect of Confining Reinforcement on Fire Behavior of Reinforced Concrete Columns: Experimental and Numerical Study
- Seismic evaluation of grouted splice sleeve connections for reinforced precast concrete column-to-cap beam joints in accelerated bridge construction
检索历史
应用推荐
