集中扭矩荷载作用下简支薄壁单室箱梁的约束扭转应力  

Restrained Torsional Stress of Simply Supported Thin-walled Single Cell Box Girder under Concentrated Torque Load

作　　者：张利强 周鹏杰 宋克昌 房光文 李云斌 ZHANG Liqiang;ZHOU Pengjie;SONG Kechang;FANG Guangwen;LI Yunbin(School of Environment and Urban Construction,Lan Zhou City University,Lanzhou 730070,China;State Grid Shaanxi Electric Power Company Limited Research Institute,Xi an 710065,China)

机构地区：[1]兰州城市学院环境与城市建设学院,兰州730070 [2]国网陕西省电力有限公司经济技术研究院,西安710065

出　　处：《科技和产业》2024年第17期329-335,共7页Science Technology and Industry

基　　金：甘肃省高校青年博士支持项目(2023QB-062)。

摘　　要：为研究简支薄壁箱梁横截面参数对扭转应力的影响,以单室箱梁为例,推导出扭转中心、广义主扇性坐标及主扇性静矩等扭转几何特性的实用计算公式。用解析法和ANSYS实体单元计算简支箱梁算例的翘曲正应力和剪应力,并研究悬臂板宽度和箱室高度变化对广义扇性静矩、二次剪应力及剪应力系数的影响规律。结果表明:按本文方法计算翘曲应力与ANSYS模拟结果吻合较好;悬臂板宽度和底板宽度比值为0.3时,能充分发挥腹板承受剪力的作用;随着悬臂板宽度与顶板宽度的比值和箱室高宽比的增大,顶、底板中点处的广义扇性静矩呈现出完全不同的变化规律。In order to study the influence of cross-sectional parameters of simply supported thin-walled single-chamber box girder on torsional stress,taking a single-chamber box girder as an example,practical formulas for calculating torsional geometric properties such as torsional center,generalized main fan coordinates and main fan static moment are derived.The buckling normal stress and shear stress of a simple supported box girder are calculated by using the analytical method and ANSYS solid element.The effects of the width of cantilever plate and the height of chamber on the general static moment of fan,secondary shear stress and shear stress coefficient are also studied.The results show that the warping stress calculated by the method in this paper is in good agreement with the ANSYS simulation results.When the ratio of the width of the cantilever plate to the width of the bottom plate is 0.3,the role of the web bearing shear force can be fully exerted.With the increase of the ratio of the width of the cantilever plate to the width of the roof and the ratio of the height to width of the chamber,the generalized fanning static moment at the midpoint of the roof and bottom plate shows completely different change laws.

关 键 词：薄壁箱梁 扭转应力 广义扇性静矩 二次剪应力 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]