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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 large span steel truss cable-stayed bridge in a mountainous area as an example, the structural dynamic characteristics of the cable-stayed bridge during the construction period are analyzed. Then, the aerodynamic parameters of the steel truss stiffening girder are identified by numerical simulation and the wind Field simulation program verifies the applicability and accuracy of the simulated fluctuating wind field through the correlation test of the simulated wind speed time history curve. Finally, the chattering response under the most unfavorable operating conditions of the steel truss cable-stayed bridge in mountainous area was calculated by time-domain analysis. The analysis shows that wind-induced dynamic instability does not occur during the construction period, and the wind-induced chattering response will not affect the structural safety without adopting wind-resistant measures.