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。
Large responses usually appear on isolated bridges with LRB(Lead-Rubber-Bearings) under near-fault earthquake and 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 in accordance with different mechanical properties and bearing parameters of isolated bridges were performed.According to the results of LRB bridge's responses,the system response function with acceleration of deck,displacement of pier top,displacement of LRB and dimension of lead diameter as variables were derivated.It is found that there is an optimum 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's natural frequency.
出处
《振动与冲击》
EI
CSCD
北大核心
2011年第6期134-138,共5页
Journal of Vibration and Shock
基金
湖北省自然科学基金项目(2009CDB418)
关键词
近断层地震
LRB桥梁
整体响应函数
屈服力优化
near-fault earthquake
isolated bridge
system response function
yield strength optimziation