2019, 11(4): 96-103. doi: 10.16670/j.cnki.cn11-5823/tu.2019.04.15
多次地震动作用下对桥梁圆端空心墩的位移响应研究
| 1. | 昆明理工大学 土木工程系，昆明 650093 |
| 2. | 云南博航交通科技有限公司，昆明 650000 |
Study on Displacement Response of Bridge Circular End Hollow Pier under Multiple Earthquakes
| 1. | Faculty of Construction Engineering, Kunming University of Science and Technology, Kunming 650093, China |
| 2. | Yunnan Bohang Transportation Technology Co., Ltd., Kunming 650000, China |
引用本文:
周博宇, 吴永红, 邹大晴, 熊丽婷. 多次地震动作用下对桥梁圆端空心墩的位移响应研究[J]. 土木建筑工程信息技术,
2019, 11(4): 96-103.
doi: 10.16670/j.cnki.cn11-5823/tu.2019.04.15
Citation:
Zhou Boyu, Wu Yonghong, Zou Daqing, Xiong Liting. Study on Displacement Response of Bridge Circular End Hollow Pier under Multiple Earthquakes[J]. Journal of Information Technologyin Civil Engineering and Architecture,
2019, 11(4): 96-103.
doi: 10.16670/j.cnki.cn11-5823/tu.2019.04.15
摘要:实际结构往往遭遇多次地震动作用，而目前国内抗震设计规范考虑的仅为单一地震事件影响，尚无法考虑多次地震动下桥梁结构的响应情况。针对上述现象，作者以秋末河大桥为工程背景，基于抗震分析软件OpenSees对铁路圆端空心墩进行传统及累积增量动力分析数值模拟，通过对比两种情况下位移响应情况来研究多次地震动的影响。结果表明：1)该铁路圆端空心墩较柔，高阶振型较为明显，结构最大位移及残余位移随峰值加速度的增加而增加；2)较单一地震作用而言，多次地震动下，结构的最大位移及残余位移均偏大；3)两种不同分析方法，对于结构最大位移响应，当结构处于弹性状态，其差异不明显，当结构处于弹塑性状态，其差异较大不可忽略；对于残余位移而言，其差异均较为明显，不可忽略。
Abstract: Structures are often subjected to multiple earthquakes.However, at present, the domestic seismic design specifications in China always consider the impact of single earthquake event, and ignore the response of the bridge structure under the action with multiple earthquakes.In view of this, the authors take the Qiumohe River Bridge as a case study example, to conduct numerical simulation of traditional and cumulative incremental dynamic analysis (IDA) of hollow pier circular end of railway bridge by using the seismic analysis software, OpenSees.The influence of multiple ground motions is studied by comparing displacement responses in two cases.The results show that:(1)The round-ended hollow pier of the railway is soft and the high-order vibration mode is obvious.The maximum displacement and residual displacement of the structure increase with the increase of the peak acceleration.(2)Compared with the single earthquake, the maximum displacement and residual displacement of the structure are both larger with multiple earthquakes.(3)There are two different analysis methods for the maximum displacement response of the structure.When the structure is in an elastic state, the difference is not obvious; and when the structure is in the elastoplastic state, the difference is not negligible.However, for residual displacement, the difference is obvious and cannot be ignored.
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