高阶振型对高墩桥梁抗震性能的影响及其识别

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (17) : 81-85.

论文

高阶振型对高墩桥梁抗震性能的影响及其识别

卢皓，管仲国，李建中

作者信息 +

Higher modes effect on bridge seismic performance and its identification

Lu Hao, Guan Zhongguo, Li Jianzhong

Author information +

文章历史 +

摘要

针对墩高60m、90m 的典型高墩桥梁，运用增量动力分析方法（IDA）和基于基阶振型的非线性静力推倒方法（MPA）
计算高墩屈服位移、极限位移、位移延性以及临界状态的墩身曲率分布，通过两种方法计算结果的对比分析，评价不同地震
波激励下，高阶振型对桥墩延性能力的影响。描述不同地震作用下曲率沿墩高的分布，指出高墩桥梁在强震作用下，除墩底
塑性铰外，还会在墩身中上部形成第二个塑性铰区域，并绘制能力谱和需求谱识别高墩在不同临界状态下各高阶振型进入塑
性的程度，证实墩身出现塑性铰主要是由于第二阶振形的贡献。

Abstract

For the bridges with 60m、90m pier height, yield, ultimate displacements, displacement ductility and curvature distribution
on the critical state are determined with the incremental dynamic analysis(IDA) and Pushover method considering the fundamental
mode(MPA). After analyzing the results from IDA and MPA, higher modes effect on pier ductility is evaluated in different earthquake.
Curvature distribution on piers in different earthquake are described to point out that under strong earthquake plastic hinge develop in
the middle and upper part of pier except in the base of pier. Capacity diagram and demand diagram are developed to identify the
plastic degree of higher mode respectively on different critical state, which are used to verify that the occurrence of plastic hinge in
middle and upper part of pier is attributed to the second mode.

导出引用

卢皓;管仲国;李建中. 高阶振型对高墩桥梁抗震性能的影响及其识别[J]. 振动与冲击, 2012, 31(17): 81-85

Lu Hao;Guan Zhongguo;Li Jianzhong. Higher modes effect on bridge seismic performance and its identification[J]. Journal of Vibration and Shock, 2012, 31(17): 81-85