基于振动台试验的刚构桥近断层效应动力响应分析  

DYNAMIC RESPONSE ANALYSIS OF NEAR-FAULT EFFECTS OF RIGID-FRAMED BRIDGES BASED ON SHAKING TABLE TESTS

作　　者：闫晓宇[1,2] 赵卓[3] 王卓[1] YAN Xiaoyu;ZHAO Zhuo;WANG Zhuo(School of Engineering,the Open University of China,Beijing 100039,China;Key Laboratory of Coast Civil Structure Safety of China Ministry of Education,Tianjin University,Tianjin 300072,China;Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[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

出　　处：《工业建筑》2021年第1期81-85,共5页Industrial Construction

摘　　要：对1∶10比例三跨刚构桥模型进行考虑多点激励的缩尺模型振动台台阵试验,在此基础上建立模型桥的有限元模型,选取了10条典型的近断层地震动和10条远场地震动,对其作用下刚构桥的动力响应进行对比分析。研究表明:地震动空间效应对桥墩变形、受力均为不利因素,其影响程度与墩梁约束形式、波速的取值密切相关;与远场地震动相比,近断层地震动(峰值速度与峰值加速度的比值a PGV/a PGA)较大;考虑近断层效应后,桥墩变形、受力均发生增长,主梁跨中弯矩与主梁水平位移也相继增大。因此,近断层效应、地震动空间效应在抗震设计中均应该予以考虑,使分析结果更准确。A shaking tables test considering multi-support excitation was conducted on the 1 ∶ 10 scale three-span rigid-framed bridge. Taking the results of the test as a base,the finite element model of the bridge was established.Ten typical near-fault ground motions were selected for analysis. Then,the comparative analysis of the dynamic responses between the far-field ground motions and near-fault ground motions was completed. The research showed that the spatial effect of ground motion was unfavorable to the deformation and stress of piers,and its influence was closely related to the constraint forms of piers and girders and the wave velocity. Compared with the far-field ground motion,the aPGV/aPGAof the near-fault ground motion was larger. Considering the near-fault effect,the deformation and stress of the piers increased,and the mid-span bending moment and horizontal displacement of the main girders also increased. Therefore,near-fault effect and ground motion spatial effect should be considered in seismic design to make the analysis results more accurate.

关 键 词：刚构桥 多点激励 振动台阵试验 动力响应 近断层地震 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]