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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。
In order to study the influence of spatial change site on seismic performance of ultra-high pier railway bridges in mountainous area, an ultra-high pier railway bridge in Guizhou Province is taken as the engineering background. The virtual excitation method is used to test the ultra-high pier railway bridges under space-varying conditions Theoretical Analysis and Numerical Simulation of Seismic Performance. Considering the effect of multi-dimensional seismic motion on the random seismic responses of such bridges under the combination of the spatial variations of the distribution of the three types of sites, ie hard, mid-field and soft-site, The results show that the influence of different site combinations on the seismic response of the ultra-high pier railway bridge is different, and the influence of the site conditions at the highest pier on the structural response is particularly obvious. The highest pier is soft and the other is hard , Which should be avoided as the most unfavorable conditions. For the seismic response analysis of the ultra-high pier railway bridge, the influencing factors of the site conditions of the space change should be fully taken into consideration. Otherwise, the response of the structure under the earthquake will be underestimated.