下承式系杆拱桥动力特性及地震响应分析

Dynamic Characteristics and Seismic Response Analysis of Under-supported Tied Arch Bridge

为了研究下承式系杆拱桥的动力特性及地震响应,以某座下承式系杆拱桥为研究对象,采用Midas/Civil软件进行有限元建模,研究分析不同的风撑设置形式与拱肋内倾角对桥梁结构的动力特性及地震响应的影响。经过研究分析得出结论:风撑设置形式对高阶自振频率存在较大影响,拱肋内倾角有利于拱结构受力要求,也能减少拱结构的位移,选择合适的拱肋内倾角,有利于桥梁整体结构受力要求。

In order to study the dynamic characteristics and seismic response of the underlying tied arch bridge,this paper takes a down-supported tied arch bridge as the research object,and uses Midas/Civil software to carry out finite element model so as to study and analyze how different wind bracing settings and rib inclination act on the dynamic characteristics and seismic response of the bridge structure.According to the research and analysis,it is concluded that the wind bracing setting has a great influence on the high-order natural vibration frequency,the introversion angle of the arch rib is beneficial to the force requirement of the arch structure,which can also reduce the displacement of the arch structure and so it is conducive for the overall structural requirements of the bridge to select the appropriate rib inclination angle.