劲性骨架拱桥施工过程拱圈力学行为分析  

Analysis of mechanical behavior of arch ring during construction of stiff skeleton arch bridge

作　　者：李长胜 邓年春[1,2,3,5] 林春姣 郭晓[1,2,3] LI Chang-sheng;DENG Nian-chun;LIN Chun-jiao;GUO Xiao(School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Disaster Prevention and Engineering Safety,Guangxi University,Nanning 530004,China;Guangxi Special Geological Highway Safety Engineering Technology Research Center,Guangxi University,Nanning 530004,China;Guangxi Transportation Science and Technology Group Co.,Ltd.,Nanning 530004,China;Guangxi Road and Bridge Engineering Group Co.,Ltd.,Nanning 530004,China)

机构地区：[1]广西大学土木建筑工程学院,南宁530004 [2]广西大学广西防灾减灾与工程安全重点实验室,南宁530004 [3]广西大学广西特殊地质公路安全工程技术研究中心,南宁530004 [4]广西交科集团有限公司,南宁530004 [5]广西路桥工程集团有限公司,南宁530004

出　　处：《桂林理工大学学报》2022年第4期871-877,共7页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(51878186,51868006,51738004);广西科技重大专项(桂科AA18118055);广西科技计划项目(桂科AB17292018,桂科AB1850043);广西高等学校高水平创新团队及卓越学者计划项目(桂教人〔2018〕35号)。

摘　　要：以南盘江特大桥为背景,采用软件Midas/Civil建立三维有限元模型,分析工作面的起点位置、斜拉扣索的调载等因素对外包混凝土施工过程拱圈力学行为的影响。基于外包混凝土节段对控制截面的应力影响值曲线,快速确定多工作面均衡施工方案的工作面起点,相比每环外包混凝土等分浇注的方案,本文方案管内混凝土最大瞬时应力的降幅达47.33%。斜拉扣索调载时,相比变截面处弦管未尽早外包混凝土的施工方案,本文优化方案管内混凝土最大永存应力值降幅10.21%。结果表明:不同位置的外包混凝土在控制截面会引起相反的影响,合理组合可有效减小结构的瞬时应力;控制截面弦管尽早为外包混凝土所包裹,其所受荷载可被分担,借助斜拉扣索可再次降低弦管永存应力的应力水平。From the analysis of Nanpan River Bridge,the three-dimensional finite element model was established by Midas/Civil to analyze the influence of factors:the starting position of the working faces and the load adjustment of the stay cables on the mechanical behavior of the arch during the construction of the outsourced concrete.Based on the curves of the stress influence value of the outsourced concrete segment on the control section,the starting points of the multi-face balanced construction plan were quickly determined.Compared with the plan of equal casting of the outsourced concrete for each ring,the maximum instantaneous stress of concrete in pipe can be reduced by 47.33%in the optimized scheme.During the load adjustment of the stay cable,the maximum permanent stress value of the concrete in the pipe was reduced by 10.21%in the optimized scheme.The results show that the outsourced concrete at different positions will cause opposite effects on the control section,and a reasonable combination can effectively reduce the instantaneous stress of the structure.When the chord of control section was wrapped by the outsourced concrete as soon as possible,the load on it can be shared,and the stress level of the permanent stress can be reduced again with the help of the stay cable.

关 键 词：劲性骨架拱桥 数值分析 外包混凝土 斜拉扣索 力学行为 

分 类 号：U24[交通运输工程—道路与铁道工程]