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以二维河谷地形在SV波垂直入射和斜入射下的结果作为地震动输入,分析了地形因素导致的地震动差异对一座桥墩高差悬殊的连续刚构桥地震反应的影响,并与一致激励下的结果进行了对比。结果表明:与一致激励相比,考虑地形效应的多点激励作用下,刚构桥地震反应存在显著差异,难以找到规律性,不同的结构部位其最大内力的表现各不一样;多点激励使主梁遭受不利反应;斜入射对低墩和主梁有显著影响,使其内力显著增加或使结构各部位内力分布明显不均衡;与低墩相比,高柔的桥墩对多点激励相对不敏感;大跨度桥梁抗震分析与设计应考虑局部场地和入射波的入射方向和角度的影响。
Taking the results of two-dimensional river valley terrain under the vertical incidence and oblique incidence of SV wave as the input of ground motion, the influence of the ground motion caused by the terrain on the seismic response of a continuous rigid frame bridge with a large difference in pier height is analyzed and compared with the consistent excitation The results under the comparison. The results show that compared with the consistent excitation, the seismic response of the rigid frame bridge is significantly different under the multi-point excitation considering the terrain effect, and it is difficult to find the regularity. The performance of the maximum internal force of different structural parts is different. The main beam suffered adverse reaction; oblique incidence of low pier and the main beam have a significant impact, so that its internal force significantly increased or the structural parts of the internal force distribution is not balanced; compared with the low pier, high soft bridge pier on the multi-point incentive is not Sensitive; seismic analysis and design of long-span bridges should consider the impact of local incident and incident wave directions and angles.