下承式钢管混凝土拱桥自振特性敏感性分析  

Sensitivity Analysis of Natural Vibration Characteristics of Undercarriage Concrete-filled Steel Tube Arch Bridge

作　　者：陆相林 LU Xianglin(Guangxi Liubin Expressway Construction and Development Co.,Ltd.,Binyang,Guangxi 530400,China)

机构地区：[1]广西六宾高速公路建设发展有限公司,广西宾阳530400

出　　处：《黑龙江交通科技》2024年第6期59-62,共4页Communications Science and Technology Heilongjiang

摘　　要：为研究下承式钢管混凝土拱桥自振特性的影响因素,针对下承式钢管混凝土拱桥结构本身设计参数进行敏感性自振特性分析,结合数值分析软件建立三维空间有限元模型,采用多重利兹向量分析法,研究拱肋钢管之间横撑、钢管壁厚、拱肋钢管直径对下承式钢管混凝土拱桥自振特性的影响。结果表明,拱肋之间横撑和拱肋钢管直径的增大会提高拱肋刚度,从而增强整体结构刚度,由此对结构自振特性影响较大。而拱肋钢管壁厚的增加基本不影响结构刚度,因此不会对结构自振特性产生影响。因此在设计过程中可以着重考虑比选拱肋横撑布置形式和优化拱肋钢管直径。In order to study the factors affecting the natural vibration characteristics of the undercarriage concrete-filled steel tube arch bridge,the sensitive natural vibration characteristics of the undercarriage concrete-filled steel tube arch bridge were mainly analyzed based on the design parameters of the structure itself.A three-dimensional finite element model was established combined with numerical analysis software,and Multi-Ritz Vector Method was adopted.The influence of the transverse brace between the arch ribbed steel pipes,the wall thickness of the steel pipes and the diameter of the arch ribbed steel pipes on the natural vibration characteristics of the concrete-filled steel tube arch bridge is studied.The results show that the increase of the diameters of the transverse brace and steel pipe in the arch rib will increase the stiffness of the arch rib and enhance the stiffness of the whole structure,which has a great influence on the natural vibration characteristics of the structure.The increase of arch rib steel pipe wall thickness basically does not affect the structural stiffness,so it does not affect the structure's natural vibration characteristics.Therefore,in the design process,we can focus on the specific selection of arch rib cross brace layout and optimization of arch rib steel pipe diameter.

关 键 词：拱桥 钢管混凝土 下承式 自振特性 敏感性分析 

分 类 号：U492[交通运输工程—交通运输规划与管理]