不同类型地震动作用下自复位摇摆桥梁延性需求谱研究  

Ductility demand spectra for self-centering rocking bridges under different types of ground motions

作　　者：王宝夫 张红芬 张丽华 齐宏伟 WANG Baofu;ZHANG Hongfen;ZHANG Lihua;QI Hongwei(Architectural Engineering College,North China Institute of Science and Technology,Beijing 101601,China;Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]华北科技学院建筑工程学院,北京101601 [2]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124

出　　处：《地震工程与工程振动》2021年第4期157-164,共8页Earthquake Engineering and Engineering Dynamics

基　　金：河北省自然科学基金项目(E2019508162);廊坊市科学技术研究与发展计划项目(2019013080,2018013022);中央高校基本科研业务费项目(3142016006)。

摘　　要：自复位摇摆桥梁的损伤和残余位移小,具有良好的震后可恢复性。文中以自复位摇摆桥梁为研究对象,对不同类型地震动作用下的结构的延性需求谱及其影响因素进行研究。选用FEMA P695推荐的100条典型地震动作为输入,并划分为远场地震动、近场脉冲地震动以及近场无脉冲地震动。研究结果表明,近场脉冲地震动作用下的结构的延性需求最大,设计时需考虑近场脉冲地震动的影响;随着强度折减系数R的增大,结构的延性需求显著增加,设计时不宜采用较高的强度折减系数;增加刚度比α和耗能系数β能在一定周期范围内减小结构的延性需求;阻尼比ξ在0.01-0.05范围内对延性需求的影响基本可以忽略。The response of self-centering rocking bridges display minimal damage and residual displacement,exhibiting favorable post-earthquake resilience.Characteristics and the influence of design parameters on ductility demand spectra for self-centering rocking bridges under different types of ground motions were investigated.A total of 100 typical ground motions recommended by FEMA P695 were used and the ground motions were grouped into far-field,near-field pulse and near-field no pulse ground motions.The results show that ductility demand of the structure under near-field pule ground motions is the greatest and the influence of near-field pulse ground motions should be considered in seismic design of the structural system.Ductility demand of the structural system increases significantly as the increase of strength reduction factor R.The use of higher strength reduction factor are not allowed in seismic design.With the increase of post-yield stiffness ratioαand hysteretic energy dissipation ratioβ,ductility demand of the structural system decrease within a certain period range.The variation of damping ratioξranging from 0.01 to 0.05 has marginal influence on ductility demand.

关 键 词：自复位摇摆 延性需求谱 强度折减系数 刚度比 耗能系数 

分 类 号：TU4[建筑科学—土工工程]