混合式叠合梁斜拉桥施工及成桥阶段桥面板剪力滞效应研究  

Study on the Shear Lag Effect of Deck Slab of Hybrid Composite Girder Cable-stayed Bridge in Construction and Completed Bridge Stage

作　　者：胡俊[1,2] 莫太东 贾俊峰[3] 

机构地区：[1]山区桥梁与隧道工程国家重点实验室培育基地,重庆400074 [2]重庆交通大学土木工程学院,重庆400074 [3]北京工业大学建筑工程学院,北京100124

出　　处：《铁道建筑》2016年第6期36-39,共4页Railway Engineering

基　　金：山区桥梁与隧道工程国家重点实验室培育基地(重庆交通大学)开放基金(CQSLBF-Y13-7)

摘　　要：以一大跨径叠合梁斜拉桥为对象,采用梁、板单元建立斜拉桥的空间有限元模型,研究上字形钢主梁的叠合梁斜拉桥在施工过程及成桥阶段桥面板剪力滞效应。根据实际施工工序,模拟分析了恒载作用下叠合梁斜拉桥在悬臂施工阶段、成桥阶段以及混凝土收缩徐变10年后桥面板应力的变化情况。计算结果表明:施工阶段桥面板剪力滞效应比成桥阶段更明显,施工阶段桥面板正应力逐渐趋于均匀;由于拉索产生的应力集中,斜拉索锚固处剪力滞效应比拉索中间更加明显;混凝土收缩徐变使桥面板产生了拉应力,虽然降低了压应力储备,但使得桥面板应力分布更均匀。Taking the large-span composite girder cable-stayed bridge as subject,the shear lag effect of deck slab of composite girder cable-stayed bridge in construction and completed bridge stage was studied by establishing the spatial finite element model with beam and plate element. The stress changes of deck slab were analyzed during the cantilever construction, completed bridge stage and after 10 years of shrinkage and creep of concrete. The results indicate that the shear lag effect of deck slab in construction stage is more obvious than that in completed bridge stage, and the stress in construction stage is gradually uniform. The shear lag effect is more obvious at the anchor position of the cable because of the stress concentration effect. The shrinkage and creep effect will bring stress reduction of the bridge deck, but also the stress distribution will be more uniform.

关 键 词：斜拉桥 叠合梁 桥面板 剪力滞效应 

分 类 号：U441.5[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程]