大跨径钢管混凝土拱桥施工阶段地震响应分析

Seismic Response Analysis of Long Span Concrete Filled Steel Tubular Arch Bridge During Construction

为了研究大跨径钢管混凝土拱桥施工阶段地震响应,以四川某高速大跨径钢管混凝土拱桥为工程背景,借助有限元软件基于反应谱法和时程分析法分析了钢管混凝土拱桥各个施工阶段主拱圈拱肋的位移与内力响应.结果表明:地震激励作用下,大跨径钢管混凝土拱桥所有施工阶段中,吊装第五段拱肋纵桥向位移最大;吊装第六段拱肋竖向位移最大;灌注立柱混凝土阶段拱肋横桥向位移最大;成桥阶段拱肋受力最不利.

In order to study the seismic response of long-span concrete-filled steel tubular arch bridge in construction stage,taking a high-speed long-span concrete-filled steel tubular arch bridge in Sichuan as the engineering background,the displacement and internal force response of arch rib of main arch ring of concrete-filled steel tubular arch bridge in each construction stage were analyzed based on response spectrum method and time history analysis method with the help of finite element software.The results show that,under the action of earthquake excitation,in all construction stages of long-span CFST arch bridge,the longitudinal displacement of arch rib in the fifth section of hoisting is the largest,and the vertical displacement of arch rib in the sixth section of hoisting is the largest.The transverse displacement of the arch rib is the largest in the concrete pouring stage,and the stress of the arch rib is the most unfavorable in the completion stage.