窄桥面悬索桥非线性抖振时域分析

以一主跨278 m,桥面宽4 m的钢桁架加劲梁窄桥面悬索桥--新疆赛吾迭格尔大桥为工程背景,对窄桥面悬索桥的风致抖振响应进行有限元仿真模拟分析,并对可能影响抖振分析结果的非线性因素进行了分析.分析结果表明:对于该类型悬索桥,结构的大变形效应对抖振响应影响为负,计算动力响应可以偏保守不考虑结构的大变形,各因素对主梁各方向抖振响应的影响各不相同,抖振对横向位移的影响比较大,应该重点考虑.

Time Domain Analysis of Nonlinear Buffeting of Narrow Deck Suspension Bridges

Backgrounded by the Saiwudiegeer Bridge in Xinjiang, a steel truss stiffening girder suspension bridge having a main span 278 m and a narrow deck width 4 m, the finite element simulation analysis is made for the wind-induced buffeting response of the type of the bridges and the nonlinear factors that may have influence on the results of the analysis are analyzed. The results of the analysis indicate that for the type of the bridges, the influence of the large deformation effect of the structures in relation to the buffeting response is negative, the calculated dynamic response can be slightly conservative, not taking into account of the large deformation effect and the influence of various factors on the buffeting response along different directions of the stiffening girders is not the same. However, the buffeting has considerable influence on the lateral displacement, which should be considered particularly.