高墩大跨连续刚构桥长周期地震响应对比研究

发布时间：2018-12-27 12:21

【摘要】：为研究长周期地震波对高墩大跨连续刚构桥地震响应的影响,基于OpenSEES平台建立了考虑材料和几何双重非线性的全桥动力分析模型,针对远场谐和型、近断层脉冲型和近断层滑冲型3类长周期地震波,与现行规范协调的普通地震波和人工波等5类共20条波进行非线性时程对比研究。结果表明:长周期地震动对高墩关键截面内力响应的放大作用非常明显,低频成分最丰富的远场谐和型地震波的内力计算值为普通波和人工波的2~4倍;而对高墩位移响应的放大作用比内力更显著,远场谐和型地震波的墩顶位移值超过普通波和人工波的20倍,导致支座剪断破坏;以现行规范反应谱为基准进行抗震设计,会大大低估高墩桥梁的地震内力和位移响应需求,引发灾难性的后果。
[Abstract]:In order to study the effect of long-period seismic waves on the seismic response of long-span continuous rigid frame bridges with high piers and large spans, a full-bridge dynamic analysis model considering material and geometric nonlinearity was established based on the OpenSEES platform. Three types of long period seismic waves of near fault pulse type and near fault slip type are studied in nonlinear time history comparison with 5 kinds of normal seismic waves and artificial waves which are coordinated with the current code. The results show that the amplification effect of long-period ground motion on the internal force response of the key section of high pier is very obvious, and the calculation value of the internal force of the far-field harmonic seismic wave with the richest low-frequency component is 2 ~ 4 times that of the ordinary wave and the artificial wave. The amplification of displacement response of high pier is more obvious than that of internal force. The displacement of the pier top of the far field harmonic seismic wave is 20 times higher than that of the ordinary wave and artificial wave, which leads to the shear failure of the support. Seismic design based on the current code response spectrum will greatly underestimate the demand for seismic internal force and displacement response of bridge with high piers, which will lead to disastrous consequences.
【作者单位】：重庆交通大学土木工程学院;重庆交通大学山区桥梁与隧道工程国家重点实验室培育基地;
【基金】：交通运输部应用基础研究计划项目(编号:2014319814210) 重庆市基础与前沿研究计划项目(编号:cstc2015jcyjA30014) 国家自然科学基金资助项目(编号:51408089) 山区桥梁与隧道工程国家重点实验室培育基地开放基金项目(编号:CQSLBF-Y14-2) 大学生创新创业训练计划项目(编号:20140618)
【分类号】：U442.55

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