移动荷载作用下钢管拱桥动力特性分析

Dynamic Characteristics Analysis of Steel Tube Arch Bridge under the Action of Moving Load

通过大型通用有限元软件ANSYS,对某一钢管混凝土拱桥进行数值模拟,通过改变其结构的部分参数,分析计算移动荷载作用对钢管拱桥动力特性的影响。研究结果表明:移动荷载作用时对桥梁结构动力性能的影响存在一个临界速度问题,当移动速度达到临界车速时,桥梁结构的振动幅度达到最大。提出为控制桥梁结构在移动荷载作用下的振动幅度,必须对车辆的行驶速度进行合理限制,该分析结果可为此类桥移动荷载作用下动力性能研究提供参考。

The numerical simulation of a concrete-filled steel tube arch bridge is carried out by the large-scale general finite element software ANSYS.The influence of moving load on the dynamic characteristics of the steel tube arch bridge is analyzed and calculated by changing some structural parameters.The research results show that:there is a critical speed problem in the influence of moving load on the dynamic performance of bridge structure,and the vibration amplitude of bridge structure reaches the maximum when the moving speed reaches the critical speed.In order to control the vibration amplitude of bridge structure under the action of moving load,it is necessary to limit the running speed of vehicle reasonably.The analysis results can provide reference for the dynamic performance research of this kind of bridge under the action of moving load.