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基于随机振动理论确定桥梁地震碰撞的临界间隙

, PP. 156-161

Keywords: 梁桥,地震碰撞,间隙,随机振动,随机等效线性化,复模态

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Abstract:

确定梁桥邻跨间避免地震碰撞的最小间隙,对于梁桥地震碰撞危险性预测及防地震碰撞措施的设计有着显著意义.本文基于随机振动理论建立梁桥地震碰撞邻跨临界间隙的计算方法,分析模型采用跨径不等的两跨简支梁桥,且考虑隔震支座非线性恢复力的影响.文中首先建立了系统的非线性运动方程;随后运用随机等效线性化理论将其线性化;最后在复模态空间推导了临界碰撞间隙的均值与方差的计算方法.人工地震动的非线性时程分析结果验证了本文算法的正确性.参数分析表明,临界间隙随邻跨长度比增大而增大,随支座屈服力与上部结构重量比值减小而增大,随隔震支座屈服位移增大而增大,随桥墩振动周期增大而增大.隔震支座屈服前后刚度比值对临界间隙大小影响很小.

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