【摘要】 为给大跨度斜拉桥的抗风设计提供参考,以苏通长江公路大桥(主跨1 088m的双塔双索面钢箱梁斜拉桥)为研究对象,利用结构健康监测系统采集的台风"海葵"全过程风环境和结构振动数据,采用频谱分析和数理统计方法进行了该桥风致抖振响应的实测研究。研究结果表明,该桥斜拉索和主梁的抖振加速度RMS值总体上随风速的增大而增大;就本次实测而言,该桥主梁和斜拉索的抖振加速度响应在风速大于15m/s时陡然增大,值得引起注意;与其他斜拉桥相比,该桥斜拉索在台风下的抖振响应较小,验证了其减振措施的有效性。更多还原

【Abstract】 To provide reference for the wind resistant design of long span cable-stayed bridges,the Sutong Changjiang River Highway Bridge(a steel box girder cable-stayed bridge with double pylons,double cable planes and with a main span 1 088m)was taken as the research object and the measurement of the wind-induced buffeting response of the bridge was studied by the spectral analysis and mathematical statistics methods,based on the wind environment and structural vibration data of the whole process of Typhoon Haikui acquired by the structural health monitoring system(SHMS)of the bridge.The results of the study demonstrate that the root-meansquare(RMS)values of the buffeting acceleration of the main girder and stay cables of the bridge increase with the increase of the wind speed in general.As for the measurement for the bridge this time,the buffeting acceleration responses of the main girder and stay cables dramatically increase when the wind speed exceeds 15m/s,to which attention should be paid.Compared to other cable-stayed bridges,the buffeting response of the bridge under the action of the typhoon is little,verifying that the vibration damping measures taken for the bridge are effective.更多还原