垂直提升开启式拱桥动力特性分析  

Dynamic Characteristic Analysis of Vertical Lift Bascule Arch Bridge

作　　者：孙昊[1] 庞浩然 张超[1] 郭小权 

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《建筑科学与工程学报》2018年第1期86-92,共7页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51408040)

摘　　要：首先介绍了垂直提升开启式拱桥的基本组成以及开启与闭合过程的实现,然后运用有限元软件MIDAS/Civil对一座垂直提升开启式钢管混凝土人行拱桥进行了动力特性的数值分析,研究了桥梁闭合状态和开启状态下的自振频率和振型,分析了拱肋刚度和横撑数量对该类型桥梁自振特性的影响。结果表明:桥梁开启前后的振动频率在第5阶时差别稍大,其他各阶自振频率几乎相同,振型也基本相同;开启后开启段主梁的纵向和竖向振幅较大;增大拱肋的刚度,结构自振频率增大,有利于提高拱桥的整体稳定性;横撑数量的多少对拱肋的耦合振动影响最大;所得结论可以为同类型桥梁的设计和抗震分析提供参考。Firstly,the basic composition of the vertical lift bascule arch bridge and the realization of the opening and closing process were introduced.Then,using the finite element software MIDAS/Civil,the numerical simulation analysis was performed on a vertical lift bascule concretefilled steel tubular pedestrian arch bridge to obtain dynamic characteristics.The vibration frequencies and vibration mode descriptions of the bridge in closed state and open state were studied,and the influence factors such as arch rib stiffness and the number of lateral bracing on the vibration characteristics were analyzed.The results show that the fifth order vibration frequency has quite difference between closed state and open state of the bridge,other vibration frequencies and vibration modes are almost the same.The longitudinal and vertical vibration amplitudes of the open section are notable when the bridge is in the open state.The vibration frequency and stability can be enhanced by increasing the arch rib stiffness.The number of lateral bracing has great impact on the coupled oscillation of arch rib.The research results can provide some references for the design and seismic analysis of the similar bridges.

关 键 词：拱桥 垂直提升开启桥 开合过程 动力特性 拱肋刚度 横撑 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]