静力荷载下斜腿刚架桥的受力特性分析  

Analysis of mechanical characteristics of inclined leg rigid frame bridge under static load

作　　者：殷猛 张剑锋 Yin Meng;Zhang Jianfeng(Guangzhou Nansha District Construction Center,Guangzhou 511466,China;Guizhou Provincial Transportation Planning Survey and Design Research Institute Co.,Ltd.,Guiyang 550081,China)

机构地区：[1]广州市南沙区建设中心,广州511466 [2]贵州省交通规划勘察设计研究院股份有限公司,贵阳550081

出　　处：《青海交通科技》2022年第3期109-113,125,共6页Qinghai Transportation Science and Technology

摘　　要：为探究静力荷载作用下斜腿刚架桥的受力变化特性,保证斜腿刚架桥结构设计的安全性能,本文以变截面箱梁斜腿刚架桥为研究对象,主要采用Midas有限元分析法,建立桥梁结构整体模型,计算了自重、二期恒载、收缩徐变、整体升温、整体降温、桥面升温、桥面降温和制动力等多种静力荷载作用下斜腿刚架桥主梁的弯矩、剪力和轴力,并根据计算结果研究分析了斜腿刚架桥主梁内力在各静力荷载作用下的变化情况。研究结果表明:该斜腿刚架桥的边跨跨中主要以弯剪为主,斜腿支点处和中跨跨中主要以弯压为主;根据桥梁受力特性,各截面的控制工况主要以自重、二期恒载和收缩徐变为主;制动力对主梁弯矩、剪力和轴力的影响很小。研究成果可为同类型桥梁结构设计提供数据参考。in order to explore the force change characteristics of the inclined-leg rigid frame bridge under static load and ensure the safety performance of the structural design of the inclined-leg rigid-frame bridge,this paper takes the variable-section T-beam inclined-leg rigid-frame bridge as the research object,and mainly adopts the Midas finite element method.Analytical method,the overall model of the bridge structure is established,and the inclined-leg rigid frame under the action of various static loads such as self-weight,second-stage dead load,shrinkage and creep,overall heating,overall cooling,bridge deck heating,bridge deck cooling and braking force is calculated.The bending moment,shear force and axial force of the main beam of the bridge,and according to the calculation results,the change of the internal force of the main beam of the inclined-leg rigid frame bridge under various static loads is studied and analyzed.The middle of the side span is mainly bending shear,and the fulcrum of the inclined leg and the middle of the middle span are mainly bending compression;according to the stress characteristics of the bridge,the control conditions of each section are mainly self-weight,second-stage dead load and shrinkage creep.The braking force has little effect on the bending moment,shear force and axial force of the main beam;the research results can provide data reference for the design of the same type of bridge structure.

关 键 词：斜腿刚架桥 静力荷载 MIDAS有限元 

分 类 号：U441[建筑科学—桥梁与隧道工程]