空间变化场地对超高墩铁路桥梁地震响应的影响

发布时间：2018-09-12 13:27

【摘要】：为了研究空间变化场地对山区超高墩铁路桥梁抗震性能的影响,以贵州省境内一座超高墩铁路桥梁为工程背景,采用虚拟激励法对此超高墩铁路桥梁在空间变化场地条件下进行了抗震性能理论分析和数值模拟。考虑了多维地震动作用下,硬场地、中场地和软场地三种不同场地空间变化分布组合对此类桥梁随机地震响应的影响。研究结果表明:不同的场地分布组合对超高墩铁路桥梁地震响应影响不同,最高墩处的场地条件对结构响应的影响尤为明显;最高墩处为软场地,其他墩为硬场地时结构响应最大,为最不利工况,应予避免;对于超高墩铁路桥梁地震响应分析应充分考虑空间变化场地条件的影响因素,否则会低估地震作用下结构的响应。
[Abstract]:In order to study the influence of spatial variation site on seismic performance of railway bridges with super high piers in mountainous area, a railway bridge with super high piers in Guizhou Province is taken as the engineering background. In this paper, the theoretical analysis and numerical simulation of the seismic behavior of the super-high pier railway bridge under the condition of spatial variation site are carried out by using the virtual excitation method. In this paper, the effects of the spatial variation and distribution of three different sites on the random seismic response of such bridges are considered under the action of multi-dimensional ground motion, including hard site, middle site and soft site. The results show that the effect of different site distribution combinations on the seismic response of railway bridges with super-high piers is different, the influence of site conditions at the highest piers on the structural response is especially obvious, and the soft site at the highest pier is the soft site. When the other piers are hard sites, the structural response is the largest and the most unfavorable working condition, and the seismic response analysis of the railway bridges with super-high piers should take full account of the influence factors of the spatial variation site conditions, otherwise, the response of the structure under earthquake action will be underestimated.
【作者单位】：西南交通大学土木工程系;西南交通大学土木工程学院;
【基金】：国家自然科学基金资助项目(51308465) 中央高校基本科研业务费科技创新专项基金项目(2682014CX004EM)
【分类号】：U448.13;U442.5

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