不同风荷载作用对大跨度钢管混凝土拱桥施工影响分析  

Analysis of influence of different wind loads on construction of large-span CFST arch bridges

作　　者：王诗海 唐咸远[1] 李松敖 WANG Shihai;TANG Xianyuan;LI Songao(School of Civil Engineering and Architecture,Guangxi University of Science and Technology,Liuzhou 545006,China)

机构地区：[1]广西科技大学土木建筑工程学院,广西柳州545006

出　　处：《广西科技大学学报》2020年第4期33-40,共8页Journal of Guangxi University of Science and Technology

基　　金：广西自然科学基金项目(2015GXNSFAA139270);广西交通科技项目(桂交科教发〔2012〕26号)资助。

摘　　要：为研究不同等级风荷载对施工过程中大跨度钢管混凝土拱桥的力学性能的变化,采用Midas/Civil软件对广西某主跨为336 m的中承式钢管混凝土拱桥的横桥向位移、轴力、拉压应力及拱脚处弯矩值的变化情况进行了分析.分析研究表明:横桥向位移、轴力及拱脚处弯矩随不同重现期风荷载的增加呈现先增大后减小的变化规律,在最大悬臂端阶段时横桥向位移和拱脚处弯矩取得最大值,随后逐渐减小,而轴力在拱肋合龙时取得最大值后才逐渐减小;同一施工阶段拱的拉压应力随重现期风荷载的增加而增大,构件所受的实际拉应力都小于实际压应力,但各相对施工阶段的增长率在逐渐减小.To study the changes in mechanical properties of large-span CFST arch bridges during construction by different levels of wind loads,the Midas/Civil software was used to analyze the changes of the lateral displacement,axial force,tensile and compressive stress and bending moment value of a 336 m half-through CFST arch bridge in Guangxi.The analysis show that the transverse bridge displacement,axial force and bending moment at the arch foot along the direction of cross-bridge along with increasing of wind load in different recurrence periods show the law of increase first and then decrease;at the largest cantilever end stage,the transverse bridge displacement of the bridge and the bending moment at the arch foot obtain the maximum value and after that gradually decrease,while the axial force gradually decreases after the maximum value is achieved when the arch rib is closed;the tensile and compressive stresses of the arch increase with increasing of wind load during the recurrence period at the same construction stage,the actual tensile stress suffered by the members is less than the actual compressive stress,at the same time the growth rate of each relative construction stage is slowing down.

关 键 词：钢管混凝土拱桥 风荷载 施工阶段 有限元分析 

分 类 号：U448.22[建筑科学—桥梁与隧道工程] U441.2[交通运输工程—道路与铁道工程]