非规则高墩曲线桥梁振动台试验研究

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。

Shaking tables test study of irregular curved bridge with high piers

Based on the model similarity principle and multi-point support excitation theory, a scale 1:20 curved bridge of reinforced concrete high pier seismic simulation shaking tables test were done in this paper. The high flexible pier damage model and the regular of structure dynamic response under different seismic wave spectrum and the peak acceleration and local site effect were researched. The results showed that high flexible pier damage has obvious distributional flexible characteristics, pier elevation significantly affected on pier cracks to carry out and bridges dynamic response; the curved bridge structure dynamic response has differently regular pattern under different spectrum seismic waves; curved bridge structure dynamic response peak and seismic waves acceleration peak basic linearly increases; local site effect makes structural dynamic response increase, leading to curved bridge structure dynamic response be nonlinear growth; high pier curved bridge seismic response has obvious spatiality, inclusive pier top radial dynamic response larger, transverse prone to falling beam damage.