衡阳湘江大桥主桥合拢顺序设计研究

Design of Hengyang Xiangjiang Bridge with Different Closure Sequence

目前对于多跨连续梁桥合拢方案设计大多采用参考类似桥梁的合拢方案,方案唯一确定.然而实际施工中,施工单位往往会根据实际施工情况提出不同于设计的合拢方案,合拢意味着体系转化,因此不同的合拢顺序对应不同的成桥状态,此时需要重新进行施工阶段仿真计算,故此设计中分析多种可行的合拢方案显得尤为重要.以衡阳湘江大桥为例,考虑了四种不同合拢方案,并对各种合拢方案下的成桥阶段的应力及位移做了对比分析,为类似桥梁设计提供了借鉴.

Presently, the closure project of each multi-span continuous bridge mostly refers to the similar bridges. Usually the closure project determined sure one certain closure sequence,while the construction unit might present different closure designs according to actual situation. Bridge structure system transformed during the closure, so different closure sequence formed different completion state of bridge and a new computational model needed to be built according to the actual bridge structure. Analyzing different closure projects during the design process was important. Taken Hengyang Xiangjiang bridge as example, the stress and displacement of different four closure projects at the finished bridge state were comparatively analyzed,which provided reference for similar bridges.