非规则高墩曲线桥梁振动台试验研究  

Shaking tables tests of irregular curved bridge with high piers

作　　者：程麦理 李青宁[1] 尹俊红[1] 孙建鹏[1] 周春娟[1] 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055

出　　处：《振动与冲击》2016年第2期24-30,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(51078306);国家青年基金项目(51408453);高等学校博士学科点专项科研基金(20106120110004);陕西省自然科学基础研究计划资助项目(2013JQ7007)

摘　　要：据模型相似原理及多点激励理论,对缩尺比1∶20的钢筋混凝土高墩曲线桥梁进行地震模拟振动台试验。研究高墩曲线桥梁结构在不同频谱地震波、不同峰值加速度及局部场地效应作用下高柔桥墩损伤模式及结构动力响应规律。结果表明,高柔桥墩损伤有明显的分布柔性特点,墩高差对桥墩裂缝开展及桥梁动力响应影响显著;不同频谱地震波作用下曲线桥梁结构动力响应规律各异;曲线桥梁结构动力响应峰值与地震波加速度峰值基本呈线性增长;局部地形效应使结构动力响应增大,导致曲线桥梁结构动力响应呈非线性增长;高墩曲线桥梁地震响应有明显空间性,首尾桥墩顶径向动力响应较大,易发生横桥向落梁破坏。Based on the model similarity principle and multi-point supports excitation theory, seismic simulation tests of a scale 1：20 model of curved bridge with reinforced concrete high piers were carried out on shaking tables. The flexible high pier damage modes and the structural dynamic responses under the excitations of different seismic wave spectrums and different peak accelerations were investigated and the local site effect was taken into account. The results show that the damage mode of flexible high piers has the characteristic of notably distributed flexibility. The elevation disparity among piers significantly affect the bridge＇s dynamic response and the appearance of pier cracks. The curved bridge＇s dynamic response has different pattern under different spectrum seismic waves. The peak of curved bridge＇s dynamic response increases linearly with the increase of the peak of seismic waves acceleration. The local site effect makes the structural dynamic response nonlinearly increase. The seismic responses of the bridge are of obvious spatiality, the radial dynamic responses at the pier tops are rather large and the damage of transverse beam falling is prone to come out.

关 键 词：高墩 曲线桥梁 局部场地效应 多点激励 振动台试验 地震响应 

分 类 号：TU997[建筑科学—市政工程]