| 近断层地震动下摇摆-自复位桥墩连续梁地震反应 |
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| 引用本文： | (葛超洋,孙治国,付建宇,王东升.近断层地震动下摇摆-自复位桥墩连续梁地震反应[J].世界地震工程,2023,39(2):113-124. |
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| 作者姓名： | (葛超洋 孙治国 付建宇 王东升 |
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| 作者单位： | 1. 河北工业大学 土木与交通学院,天津 300401; 2. 防灾科技学院 中国地震局建筑物破坏机理与防御重点实验室,河北 三河 065201 |
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| 基金项目： | 国家自然科学基金项目(52178473,51978167)； |
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| 摘 要： | 为讨论近断层地震动下摇摆-自复位(Rocking Self-Centering, RSC)桥墩连续梁的地震反应及其抗震优缺点。基于OpenSees有限元分析平台讨论了RSC桥墩三维建模方法，通过对6个试验构件的模拟，比较模拟与试验桥墩滞回曲线、预应力筋最大应力等指标，验证了模型准确性。建立设置RSC桥墩和普通钢筋混凝土(Reinforced Concrete, RC)桥墩的上部结构相同的两座连续梁桥，输入3组含有强速度脉冲的近断层地震波进行非线性动力时程分析，对比其抗震性能。结果表明：在0.4 g近断层地震动下，RSC桥墩与普通RC桥墩相比，RSC桥墩的最大位移角为普通RC桥墩的78.1%～97.6%,墩底曲率延性系数仅为普通RC桥墩的24.0%～34.0%,减小了桥墩的最大变形，也减轻了桥墩地震损伤，不利的一点是使用RSC桥墩会导致支座位移增大。RSC桥墩震后的残余位移较小，且预应力筋处于弹性受力阶段，为实现震后桥梁功能的快速恢复提供了条件。
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| 关 键 词： | 连续梁桥 摇摆-自复位桥墩 非线性时程分析 近断层地震动 试验 |
Seismic response of continuous beam bridge with rocking-self-centering columns under near-fault ground motion |
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| (GE Chaoyang,SUN Zhiguo,FU Jianyu,WANG Dongsheng.Seismic response of continuous beam bridge with rocking-self-centering columns under near-fault ground motion[J].World Information On Earthquake Engineering,2023,39(2):113-124. |
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| Authors: | (GE Chaoyang SUN Zhiguo FU Jianyu WANG Dongsheng |
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| Affiliation: | 1. College of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401, China; 2. Key Laboratory of Building Collapse Mechanism and Disaster Prevention,Institute of Disaster Prevention, China Earthquake Administration, Sanhe 065201, China |
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| Abstract: | The seismic response of a continuous girder bridges with rocking self-centering columns(RSC)under near-fault ground motions is discussed in this paper, aiming at discovering the advantage of the RSC columns under strong earthquake. Based on the OpenSees finite element analysis platform, the modeling method of the three-dimensional model of RSC column is developed. Through comparison of the test results amd the simulation of six test specimens' hysteresis curve, the maximum stress of the prestressed tendons and so on, the accuracy of the model is verified. Then, two continuous girder bridges, one with RSC columns and the other with ordinary reinforced concrete(RC)columns, are established. The results show that under 0.4 g near-fault ground motions, compared with ordinary RC columns, the maximum displacement ratio of RSC columns is 78.1%～97.6% of that of ordinary RC columns, and the curvature ductility coefficient at the bottom section of the column is only 24.0%～34.0% of that of ordinary RC columns. RSC columns reduces the maximum deformation as well as the seismic damage. The shortcoming of RSC columns is that they increase of bearing displacement response. The residual displacement of RSC column after earthquake is small, and the prestressed tendons are in the elastic stage, which will bring some benefits for rapid recovery of bridge function after earthquake. |
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| Keywords: | continuous beam bridges rocking self-centering columns nonlinear time-history analysis near-fault ground motions test |
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