步履式顶推施工过程中大跨度钢箱梁的受力性状  

MECHANICAL PROPERTIES OF LONG-SPAN STEEL BOX GIRDERS UNDER WALKING INCREMENTAL LAUNCHING CONSTRUCTION

作　　者：郝玉峰 HAO Yufeng(The 5th Engineering Co.Ltd.,China Railway Construction Bridge Engineering Bureau Group,Chengdu 610500,China)

机构地区：[1]中铁建大桥工程局集团第五工程有限公司,成都610500

出　　处：《工业建筑》2020年第10期133-137,共5页Industrial Construction

摘　　要：顶推施工技术因其具有对桥下基础和空间要求较低、施工效率高等特点,被广泛应用于桥梁建设之中。目前国内对于钢箱梁步履式顶推施工技术一般采用有限元模拟研究,或根据监测数据进行实际工程研究,较少有将两者结合的研究。基于下部龙大桥钢箱梁步履式顶推施工,采用MIDAS/Civil软件建立桥梁各典型工况下顶推施工有限元模型,对各工况钢箱梁顶推至最不利位置时钢箱梁关键截面应力状态及导梁前端位移进行计算,通过与现场监测数据进行对比,发现通过该模型计算所得的钢箱梁关键截面应力状态及导梁前端位移与实际施工中所得数据吻合良好,误差均不超过15%。The incremental launching construction technique has been widely used in bridge construction due to its low requirements for bridge foundations and construction spaces,and still high construction efficiency,etc.To date the walking incremental launching construction technique for steel box girders of long-span bridges has been studied by finite element simulation or analyzed by construction monitoring data,and few studies combined these two.Based on the Xiabulong Bridge,a finite element model using MIDAS/Civil was modelling to simulate its mechanical properties under representative construction stages,including stress of the most unfavorable section for the steel box girder in eath constrution case and the displacement of the guide beam front end,and the monitoring data from the field test were used for comparative analysis.The results indicated that the stress state of the steel box girder cross-section and the maximum displacement of the guide beam front end calculated by the FE model were in good agreement with the actual construction data,and the errors were less than 15%.

关 键 词：步履式顶推施工 施工应力 监测 有限元分析 

分 类 号：U445.462[建筑科学—桥梁与隧道工程] U441[交通运输工程—道路与铁道工程]