双薄壁墩T构转体桥0号块悬臂施工过程空间应力研究  

Study on the Spatial Stress in the Cantilever Construction of Block 0 of T-shaped Swivel Bridge with Double Thin-Walled Piers

作　　者：汪玄垣 李明华 Wang Xuanyuan;Li Minghua(School of Transportation Engineering,East China Jiaotong University,Nanchang 330013,China;School of Civil Engineering and Architecture,Nanchang Jiaotong Institute,Nanchang 330100,China)

机构地区：[1]华东交通大学交通运输工程学院,江西南昌330013 [2]南昌交通学院土木建筑学院,江西南昌330100

出　　处：《石家庄铁道大学学报（自然科学版）》2023年第3期30-36,共7页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

摘　　要：针对双薄壁墩的T构转体桥0号块内部结构复杂,施工阶段桥梁结构受力情况发生变化,以太白集特大桥T构桥为研究对象,对其悬臂施工阶段控制工况0号块进行空间应力分析。采用实体有限元软件MIDAS-FEA建立0号块与刚构双薄壁墩局部精细化有限元分析模型,以不同施工阶段梁段受力情况为荷载工况,通过圣维南原理在1号块块端施加荷载,分析悬臂施工过程0号块以及双薄壁墩空间受力情况与应力分布特点,为实际工程施工提供相应参考。研究结果表明,在悬臂施工阶段2种最不利状态下0号块与双薄壁墩均处于受压的状态,0号块横隔板受到很小的拉应力,双薄壁墩受到的压应力小于0号块所受到的压应力,T构转体桥最不利施工阶段为桥梁处于最大双悬臂状态时。In response to the complex internal structure of the T-shaped swivel bridge with double thin-walled piers,the stress situation of the bridge structure might change during the construction process.Taking the T-shaped bridge of the Taibaiji Grand Bridge as the research object,the spatial stress analysis of the block 0 during the cantilever construction stage was carried out to control the working conditions.The solid finite element software MIDAS-FEA was used to establish the local refined finite element analysis model of block 0 and double thin-walled pier of rigid frame.Taking the stress conditions of beam segments in different construction stages as the load conditions,the load was applied at the end of block 1 through the Adhémar Jean Claude Barréde Saint-Venant principle,and the spatial stress conditions and stress distribution characteristics of block 0 and double thin-walled pier were analyzed.The research results indicate that both the block 0 and the double thin-walled pier are in a compressed state during the cantilever construction stage,with the block 0 diaphragm subjected to very small tensile stress,and the double thin-walled pier subjected to less compressive stress than the block 0.The most unfavorable construction stage of the T-shaped rotating bridge is when the bridge is in the maximum double cantilever state.

关 键 词：双薄壁墩 T构转体桥 0号块 空间应力 

分 类 号：U445[建筑科学—桥梁与隧道工程]