腹板构造对考虑剪滞效应薄壁连续梁的影响  

Influence of Web Structure on Thin-walled Continuous Beam Considering Shear Lag Effect

作　　者：范水兵 FAN Shui-bing(China Railway 18th Bureau Group Construction and Installation Engineering Co.,Ltd.XuanWei 655418,China)

机构地区：[1]中铁十八局集团建筑安装工程有限公司,云南宣威655418

出　　处：《武汉船舶职业技术学院学报》2020年第4期158-161,共4页Journal of Wuhan Institute of Shipbuilding Technology

摘　　要：本文以兰渝铁路某单室混凝土连续箱梁为算例,利用有限元软件ANSYS建立承受特定荷载作用的混凝土薄壁连续箱梁在特定边界条件的有限元模型,对比分析了不同腹板厚度对考虑剪力滞效应下连续箱梁竖向挠曲变形的影响及敏感性5B。结果表明:(1)承受满跨均布荷载作用单室连续梁式桥,随着腹板厚度的减少,跨中位置挠度随着腹板厚变小而增大,腹板厚度减小50%,跨中竖向变形增大了23.7%。(2)箱梁的挠度与腹板厚度变化呈相反的趋势,为了增加跨度和保证桥梁安全,可以适当减小腹板厚度。In this paper,taking a single cell concrete continuous box girder of Lanzhou Chongqing railway as an example,the finite element model of concrete thin-walled continuous box girder under specific boundary conditions is established by using the finite element software ANSYS,and the influence and sensitivity of different web thickness on the vertical deflection deformation of continuous box girder considering shear lag effect are compared and analyzed.The results show that:(1)with the decrease of the web thickness,the mid span deflection increases with the decrease of the web thickness,the web thickness decreases by 50%,and the mid span vertical deformation increases by 23.7%.(2)In order to increase the span and ensure the safety of the bridge,the web thickness can be appropriately reduced.

关 键 词：剪力滞效应 薄壁连续箱梁 腹板构造 有限元法 挠度 

分 类 号：U457[建筑科学—桥梁与隧道工程]