大跨度上承式钢管混凝土拱桥地震响应分析  

Analysis of Seismic Response of Long-span Top-bear Arch Bridge with Concrete Filled Steel Tubes

作　　者：尹志雨[1] 

机构地区：[1]山西省交通科学研究院,山西太原030006

出　　处：《水利与建筑工程学报》2017年第2期128-132,共5页Journal of Water Resources and Architectural Engineering

摘　　要：为研究大跨度上承式钢管混凝土拱桥在地震作用下的动力响应特性,基于地震反应谱分析理论,根据设计图纸以及工程场地地震动参数等技术资料,采用MIDAS/Civil建立了某大跨钢管混凝土拱桥空间杆系有限元模型,对该桥在E1、E2地震作用下的结构响应进行了深入分析,结果表明:该桥主拱肋面外刚度相对较小,第一阶振动表现为横桥向振动;主拱肋之间的连接较弱导致基频周期较长;横撑的设置可在一定程度上提高主拱肋的面外整体稳定性;在E1、E2地震作用下,桥梁各关键构件均处于弹性工作状态,该桥满足抗震设计要求。In order to study the seismic response characteristics of long-span top-bear arch bridge with concrete filled steel tubes （CFST）, the Midas/civil which is specially designed for bridge analysis was employed to develop the spatial finite element analysis model of a long-span arch bridge with CFST according to the design drawing and ground motion parameters of engineering field. The theory of response spectrum was then adopted to thoroughly determine the dynamic response properties of this bridge under the E1 and E2 seismic action. The results indicate that due to the out-plane stiffness of main arch ribs of this bridge is relatively small, the first-order vibration shows an vibration transverse to the bridge, and the cycle of fundamental frequency is a bit long because of the weak connections between main arch ribs. To some extent the cross struts can enhance the out-plane global stability, the key components of the bridge are all in elastic state and can consistently meet the requirements of anti-seismic design under these two kinds of earthquake actions.

关 键 词：钢管混凝土拱桥 上承式拱桥 动力特性 地震响应特性 反应谱分析 抗震设防水平 

分 类 号：U442[建筑科学—桥梁与隧道工程]