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考虑大跨连续梁桥悬臂施工所面临的各种因素,对3座典型大跨连续梁桥:花瓶型实体桥墩桥梁、矩形空心薄壁桥墩桥梁和双柱实体桥墩桥梁,进行施工全过程地震反应谱分析,获得悬臂施工全过程桥梁结构地震响应的变化规律及比较特性.结果表明,在整个施工过程中内力峰值较多地集中在6#梁段、8#梁段、9#梁段、边跨合拢和桥面施工阶段,位移峰值主要集中在9#梁段和桥面施工阶段.3座桥梁之间的比较表明,总体上矩形空心薄壁桥墩桥梁在整个施工过程中表现出较大的抗震刚度,双柱实体桥墩桥梁次之,花瓶型实体桥墩桥梁最小.从抗震安全和抗震经济性的角度来看,应综合考虑施工阶段的地震风险和多个施工状态来进行大跨连续梁桥悬臂施工全过程的抗震设计.
Considering various factors of cantilever construction of long-span continuous girder bridge, three typical long-span continuous girder bridges, vault-type solid bridge piers, rectangular hollow thin-walled bridge piers and double-column solid piers and bridges, Spectrum analysis to obtain the variation regularity and comparative characteristics of the seismic response of bridge structure during the entire cantilever construction process.The results show that the internal force peaks are concentrated in the 6 # beam section, 8 # beam section, 9 # beam section, Crossing and bridge deck construction phase, the peak of displacement mainly concentrated in 9 # beam section and deck construction stage.The comparison of 3 bridges shows that the overall rectangular hollow-walled thin-wall piers bridge in the whole construction process showed a larger Seismic stiffness, followed by two-column solid bridge piers, vault-type solid bridge piers minimum.From the seismic safety and seismic economy point of view, should consider the construction phase of the seismic risk and multiple construction conditions for long-span continuous beam bridge Seismic Design of Cantilever Construction.