高烈度区连续梁桥的地震响应特性研究  

Study on seismic response characteristics of isolated bridges under high intensity ground motion

作　　者：张玥[1] 薛磊 兰方言 Zhang Yue;Xue Lei;Lan Fang-yan(School of Architecture and Civil Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054

出　　处：《工程抗震与加固改造》2020年第3期91-96,共6页Earthquake Resistant Engineering and Retrofitting

基　　金：陕西省重点研发计划项目(2018SF-359);陕西省创新人才推进计划-科技创新团队(2018-TD-040);青海省住建厅项目(2018-QK-01)。

摘　　要：以一3跨连续梁桥为背景,对高烈度区采用普通盆式支座桥梁的地震响应及铅芯橡胶支座的隔震效果进行研究。采用不同地震加速度峰值的地震波作为地震输入对结构进行非线性时程分析,分别研究了高烈度区连续梁桥的地震响应特性,以及高烈度区盆式支座和铅芯橡胶支座桥梁地震响应差异。结果表明:在高烈度区桥梁会产生更大的地震响应,主梁、桥墩和支座的地震响应明显增加;使用铅芯橡胶支座能够较好地达到减震目的,除支座位移和主梁位移外,桥墩响应和支座剪力均明显减小。在高烈度区,铅芯橡胶支座依然可以发挥减震作用,其减震效果甚至会优于在低烈度区的使用。Based on a 3-span continuous beam bridge,the seismic response of ordinary basin-supported bridges and the isolation effect of lead rubber bearings in high-intensity areas are studied.Nonlinear time-history analysis of structure is carried out by using seismic waves with different seismic acceleration peaks as the seismic inputs.The seismic response characteristics of continuous beam bridges in high-intensity areas and the seismic response of bridges in high-intensity basins and lead rubber bearings are analyzed.The results show that the bridges in the high-intensity area will have greater seismic response,and the seismic response of the main girder,piers and supports will increase significantly.The use of lead-core rubber bearings can better achieve the purpose of damping,except for the displacement of the bearings and the main in addition to the beam displacement,the pier response and bearing shear force are significantly reduced.In the high intensity zone,the lead rubber bearing can still exert the shock absorption effect,and its damping effect is even better than that in the low intensity zone.

关 键 词：连续梁桥 高烈度区 时程分析法 地震响应 减震 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]