钢管混凝土拱桥静力性能分析  

Study on the Static Performances of a CFST Tied-arch Bridge

作　　者：赵安华 秦红禧 ZHAO An-hua;QIN Hong-xi(Transfigure Design Co.,Ltd.,Changsha,Hunan 410029,China;Central South University of Forestry and Technology,Changsha,Hunan 410004,China)

机构地区：[1]创辉达设计股份有限公司,湖南长沙410029 [2]中南林业科技大学,湖南长沙410004

出　　处：《黑龙江交通科技》2023年第8期86-88,共3页Communications Science and Technology Heilongjiang

基　　金：湖南省自然科学基金项目(2020JJ4947)。

摘　　要：为综合评价一座主跨100 m的下承式钢管混凝土系杆拱桥的静力性能,采用精细化有限元仿真方法,对其在施工阶段、运营阶段拱肋受力、结构刚度以及结构稳定性开展分析,结果表明:施工阶段拱肋截面应力、运营阶段拱肋在承载能力极限状态下应力及承载能力均满足规范要求;承载能力极限状态下吊杆最大轴力为2373.08 kN,满足规范要求;结构一阶模态为拱肋横向侧倾,结构面外刚度较小;结构基频随拱肋刚度增加而增加,拱肋内倾角及横撑布置形式对结构基频无明显影响;结构一阶弹性稳定系数为4.4,满足规范要求。It can save construction costs and enhance structural economy.Based on the engineering background of a bottom-bearing CFST tied-arch bridge with a main span of 100 m,this paper analyzes the stress,structural stiffness and structural stability of the arch rib in the construction and operation stages.The results indicate that:the carrying capacity and the stress in critical sections during the construction and operation stage meet requirements of the design code;the maximal axial force in ultimate limit state is 2373.08 kN,which also meets the standards;the first-order modal of the bridge is the lateral tilt of arch rib,which manifests the structural out-of-plane stiffness is weak;the structural fundamental frequency increases with the stiffness of arch ribs,while the inclination angles of ribs and the cross brace layout have no obvious effect on the fundamental frequency;the structural coefficient of elastic stability is 4.4 and satisfy the code requirement.

关 键 词：钢管混凝土拱桥 有限元分析 拱肋受力分析 结构刚度 结构稳定性 

分 类 号：U442[建筑科学—桥梁与隧道工程]