山区钢桁梁斜拉桥施工期抖振时域分析  

Time-domain buffeting analysis for steel trussed cable stayed bridge in mountain areas during construction

作　　者：夏培华 朱浩[2,3] 

机构地区：[1]武汉天兴洲道桥投资开发有限公司,湖北武汉430011 [2]中交第二航务工程局有限公司,湖北武汉430070 [3]中交公路长大桥建设国家工程研究中心有限公司,北京100088

出　　处：《中国港湾建设》2017年第11期26-29,共4页China Harbour Engineering

摘　　要：以某山区大跨钢桁梁斜拉桥为工程背景,首先对斜拉桥施工期的结构动力特性进行了分析,然后利用数值模拟方法对钢桁加劲梁气动参数进行了识别,并编制了风场模拟程序,通过对模拟的风速时程曲线进行相关性检验,验证了模拟脉动风场的适用性和准确性。最后通过时域分析计算了山区钢桁梁斜拉桥施工期最不利工况下的抖振响应。分析表明,依托工程结构施工期不会出现风致动力失稳现象,在不采取抗风措施的情况下,风致抖振响应不会对结构安全性造成影响。Taking a long span steel trussed cable stayed bridge in mountain areas as an example, we discussed the dynamic characteristics of structure during construction stage, investigated the aerodynamic coefficients of wind loads acting on the truss girder section using method of numeral simulation, and programmed simulation program of wind field. The applicability and accuracy of simulating the fluctuating wind field were justified by the correlation test of the simulated wind speed time curve. Buffeting responses of the project under the worst work conditions were calculated by time-domain analysis. The study shows that the wind-induced dynamic instability will not appear during construction for the project, and the safety of the structure can be guaranteed without any wind resistance measures.

关 键 词：钢桁梁斜拉桥 气动力系数 抖振 时域分析 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]