斜拉桥宽幅钢-UHPC组合梁悬拼匹配分析OA

To control the deformation difference between the to-be-installed and installed segments during the cantilever assembly of wide steel-UHPC composite girders in cable-stayed bridges and achieve precise matching,this paper first introduced a matching method combining pre-hanging cables with crane unloading.Then,by taking the Guanyin Temple Yangtze River Bridge(a super-kilometer-span cable-stayed bridge with wide steel-UHPC composite girders)as the engineering background,a locally refined finite element model was established to analyze the vertical deformation laws of the matching sections during the cantilever assembly construction phase.Finally,the effects of matching sequence,pre-hanging cable force,and crane unloading ratio on the deformation and stress of the girder segments were discussed.Calculation methods for pre-tensioning cable force and unloading ratio were proposed,and the optimal unloading scheme was determined.The results show that the method of pre-hanging cables with crane unloading can effectively reduce the vertical deformation difference between the to-be-installed and installed segments during the cantilever assembly of wide steel-UHPC composite girders,creating favorable conditions for the precise matching of the splicing between to-be-installed and installed segments.