【摘要】 导致地震动空间变异性的原因主要包括几何不相干性效应和行波效应。文章首先根据O.Ramadan等人提出的方法合成地震位移波,然后对沪蓉国道上龙潭河大桥进行了抗震时程计算,对地震动空间变异性各个主要因素的单独影响、综合影响分别进行了系统分析。计算结果表明,与一致激励相比较,地震动的空间变异性对龙潭河大桥在地震作用下的动力反应具有较大的影响。更多还原

【Abstract】 The spatial variation of seismic ground motions is produced primarily by the factors of geometric incoherency effect and wave-passage effect.In this paper,a simulated ground motion is developed based on that given by O.Ramadan,then was applied to a long-span continuous rigid-framed bridge named Long Tan river bridge.The influence of each factors and their combinations is studied by the response history analysis method.The spatial variation of the earthquake ground motion can have a dramatic influence on structural response.更多还原