大跨曲线钢桁梁人行桥竖向、横向和扭转振型耦合强，人致振动舒适度评价和减振控制难度大。以湖南省长沙市浏阳河一主跨为120 m的曲线双层桥面三跨连续钢桁梁桥—汉桥为工程背景，通过理论分析和人群激励现场动力试验，识别桥梁固有模态参数，评价人致振动舒适性，优化设计调谐质量阻尼器(Tuned Mass Damper，TMD)并评价TMD的减振效果。研究表明:因桥梁第一阶竖弯模态和第一阶扭转模态的阻尼比仅为0。23％和0。3％，人致振动加速度不满足舒适性要求;采用竖向TMD进行竖弯模态和扭转模态的减振控制，减振后的桥梁满足舒适性要求。
Field Testing of Human-induced Vibration Comfort in Curved Steel Truss Bridges
It is difficult to evaluate human-induced vibration comfort and control vibration damping on a large-span curved steel truss bridge with strong coupling of vertical,lateral and torsional vibration modes.In this work,a 120 m curved double deck three-span continuous steel truss bridge over Liuyang River in Changsha city was taken as the engineering proj-ect.The natural modal parameters of the bridge was identified,the human-induced vibration comfort was evaluated,the de-sign of the tuned mass damper (TMD) was optimized,and the vibration damping effect of the TMD was evaluated through theoretical analysis and field dynamic crowd-excited test.It is shown that the damping ratios of the first-order vertical and torsional modes are only 0.23％ and 0.3％ respectively,and the human-induced vibration acceleration does not meet the comfort requirements;after using the vertical TMD to control the damping of the vertical and torsional modes,the vibration-damped bridge meets the comfort requirements.
vibration and wavesteel truss bridgehuman-induced vibrationfield testcomfort assessmentpedestrian bridge
万方数据
维普
