考虑预应力张拉效应的超宽箱梁现浇支架验算  

Checking Calculation of Cast-in-place Support for Ultra-wide Box Girder Considering Prestressed Tensile Effect

作　　者：吴拥军 吴淑康 张文学[2] 陈桂瑞 WU Yongjun;WU Shukang;ZHANG Wenxue;CHEN Guirui(China Construction Communications Engrg.Group Co.,Ltd.,Beijing100040,China;College of Architecture and Civil Engineering,Beijing University of Technology,Beijing100124,China)

机构地区：[1]中建交通建设集团有限公司,北京100040 [2]北京工业大学城市建设学部,北京100124

出　　处：《施工技术（中英文）》2021年第17期19-21,41,共4页Construction Technology

摘　　要：为研究预应力张拉对混凝土箱梁现浇支架受力的影响,以保定乐凯大街南延工程转体斜拉桥为依托,按规范对超宽混凝土箱梁现浇支架进行了混凝土浇筑工况下的承载力验算。分别建立考虑纵向预应力和横向预应力的有限元模型,分析预应力张拉对支架引起的附加荷载效应,并对比混凝土浇筑工况下支架的最大受力状态。结果表明,对于超宽预应力混凝土箱梁,预应力张拉引起的支架附加荷载不容忽略,在进行支架设计验算时应引起足够的重视。In order to study the influence of prestressed tension on the bearing capacity of cast-in-place support of concrete box girder, the bearing capacity of cast-in-place support of ultra-wide concrete box girder under the concrete pouring condition is checked according to the specification based on the swivel cable-stayed bridge for the south extension engineering of Lekai Street in Baoding. The finite element models with longitudinal and transverse prestress are built respectively to analyze the additional load effect of prestressed tension on support, and to compare with the maximum stress state of the support under the concrete pouring condition. The results shows that the additional load of the support caused by the prestressed tension can not be ignored for the ultra-wide prestressed concrete box girder, and enough attention should be paid to the design and calculation of the support.

关 键 词：桥梁工程 斜拉桥 连续箱梁 现浇支架 预应力张拉 附加荷载 有限元分析 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]