文章摘要
典型大跨连续梁桥悬臂施工全过程地震反应谱分析
Response spectrum analyses of long span typical continuous girder bridge for whole cantilever constructon process
  
DOI:
中文关键词: 典型大跨连续梁桥  悬臂施工  施工全过程  反应谱分析  抗震设计
英文关键词: long span typical continuous girder bridge  cantilever construction  whole construction process  response spectrum analysis  earthquake resistant design
基金项目:国家自然科学基金资助项目(50978194);湖南科技大学博士科研启动基金(E51364)
作者单位
郑玉国1,袁万城2 1.湖南科技大学 土木工程学院,湖南 湘潭 411201
2.同济大学 土木工程防灾国家重点实验室,上海 200092 
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中文摘要:
      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.
英文摘要:
      Kinds of influencing factors in construction were considered, the seismic response spectrum analyses for whole cantilever construction were studied and compared with three long span typical continuous girder bridges, the vase-type solid pier, the thin-wall type rectangular hollow pier and the double-column type solid pier. The variation law of the seismic responses along with the construction stages was obtained and the comparison features were found out among the three bridges. The results show that the seismic internal force peaks mainly focus on the 6#, 8#, 9# girder segment, the side span closure and the deck construction stages. However the displacement peaks mainly appear at the 9# girder segment and the deck construction stage. The comparisons among the three bridges show that the bridge with the thin-wall type rectangular hollow pier has the maximum seismic stiffness in a great degree, the bridge with the double-column type solid pier takes second place and the bridge with the vase-type solid pier has the minimum stiffness. The seismic design should comprehensively consider the earthquake hazard in construction and multi-construction stages for the long span bridge constructed by the balanced cantilever method from the perspective of seismic safety and economy.
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