基于振动台试验的刚构桥近断层土-结构相互作用地震响应研究

闫晓宇; 赵卓; 王瑾

doi:10.13204/j.gyjzG21102801

基于振动台试验的刚构桥近断层土-结构相互作用地震响应研究

doi: 10.13204/j.gyjzG21102801

闫晓宇^1,2,
赵卓³,
王瑾³

1. 国家开放大学理工教学部, 北京 100039;
2. 天津大学滨海土木工程结构与安全教育部重点实验室, 天津 300072;
3. 北京工业大学城市建设学部, 北京 100124

基金项目:

国家自然科学基金项目(51978021,51908015,52178446)。

详细信息

作者简介:
闫晓宇,女,1984年出生,博士。电子信箱:yxy840222@163.com

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- 被引次数: 0
出版历程
- 收稿日期: 2021-10-28
- 网络出版日期: 2022-12-01

Research on Near-Fault Seismic Response of Rigid Frame Bridge Based on Shaking Table Test Considering SSI Effect

1. School of Engineering, the Open University of China, Beijing 100039, China;
2. Key Laboratory of Coast Civil Structure Safety of China Ministry of Education, Tianjin University, Tianjin 300072, China;
3. Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing 100124, China

摘要

摘要: 对几何相似比1/10的3跨大跨度高墩RC刚构桥模型进行考虑桩-土相互作用的缩尺模型振动台台阵试验,基于此建立模型桥的有限元模型,选取10条典型的近断层地震动开展全桥数值模拟分析。以彭津模型为基准,对比研究SSI效应对刚构桥关键构件地震响应的影响。研究结果表明:SSI效应对刚构桥地震响应有显著影响,可导致桥梁关键构件的位移响应增大20%以上,应变响应增大50%以上,其影响程度大小为墩梁固结节点>桥墩>主梁。与远场地震相比,近断层地震作用下,结构内力与变形均有所增加,增幅1倍以上。同时考虑近断层效应和SSI效应,将进一步扩大不利影响。近断层效应、SSI效应对刚构桥地震响应均为不利要素,抗震设计时应精准考虑,以确保结构安全。
- 刚构桥 /
- 土-结构相互作用 /
- 振动台台阵试验 /
- 地震响应 /
- 近断层地震
Abstract: A three-span continuous rigid framed bridge model with a geometric similarity ratio of 1/10 was designed to carry out the corresponding shaking table tests. In the test, soil-structure interaction was considered. On the basis of the experiment, the finite element analysis model was established. Ten typical near-fault ground motions were selected to carry out the full-bridge numerical simulation analysis. Taking the Penzien model as a benchmark, a comparative study of the influence of the SSI effect on the seismic response of key components of rigid frame bridges was carried out. The results showed that SSI effect had significant influence on seismic response of rigid frame bridge. SSI effect could increase the displacement response and strain response by more than 0.2 times and 0.5 times respectively. Compared with the far-field earthquake, the internal force and deformation of the structure were increased by more than one time under the action of near-fault earthquake. Both near-fault and SSI effects would further amplify the adverse effects also should be considered. Both near-fault effect and SSI effect were unfavorable factors for seismic response of rigid frame bridge, which should be taken into precise consideration in seismic design to ensure structural safety.
- rigid-framed bridge /
- soil-structure interaction /
- shaking tables test /
- seismic response /
- near-fault ground motions

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参考文献(16)

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