基于近断层地震LRB桥梁支座屈服力优化

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (6) : 134-138.

论文

基于近断层地震LRB桥梁支座屈服力优化

李黎1,2; 胡紫东1,2; 聂肃非1,2; 龙晓鸿1,2

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Optimum yield strength of LRB for isolated bridges under Near-fault Earthquake

LI Li1,2; HU Zi-dong1,2; NIE Sui-fei1,2;Long Xiao-hong1,2

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摘要

在近断层地震作用下，LRB桥梁的响应较大，为了降低LRB支座相对位移过大给桥梁结构带来的不利影响，对LRB支座的屈服力进行了优化研究。选用了典型的近断层地震波，对具有不同力学特性和支座参数的LRB桥梁进行了考虑隔震支座非线性的地震时程分析。根据LRB桥梁的响应结果，提出了以桥面加速度、墩顶位移、支座相对位移和铅芯直径为变量的LRB桥梁的整体响应函数。通过研究发现，可以优化LRB的屈服力，使得桥梁的整体响应降低，且支座的最优屈服力与桥墩频率相关

Abstract

Isolated bridge with LRB have large response under near-fault earthquake, the isolated bridge may perform poorly because of excessively large deformation of LRB, so it is necessary to study the optimum yield strength of LRB. For this purpose, non-linear time history analyses with different mechanical properties and bearing parameters of isolated bridge were performed. According to the result of LRB bridge’s response, the system response function with acceleration of beck, displacement of pier top, displacement of LRB and dimension of lead diameter is derivated. It is found that there is an optimal yield force of LRB which makes the bridge’s response to be relatively small, and the optimum yield strength of LRB is related with pier frequency

导出引用

李黎;胡紫东;聂肃非;龙晓鸿;. 基于近断层地震LRB桥梁支座屈服力优化[J]. 振动与冲击, 2011, 30(6): 134-138

LI Li;HU Zi-dong;NIE Sui-fei;Long Xiao-hong;. Optimum yield strength of LRB for isolated bridges under Near-fault Earthquake[J]. Journal of Vibration and Shock, 2011, 30(6): 134-138