【摘要】 振动舒适度是设计大跨轻质人行桥时需要解决的关键问题之一。采用调谐质量阻尼器(TMD),可以有效降低桥梁在行人激励下的振动反应。该文基于分布参数法,提出了单跨和多跨人行桥采用STMD及MTMD减振系统的动力反应通用时程计算方法。在此基础上,以均方根加速度作为衡量标准,研究了单跨和多跨梁式人行桥-TMD系统中TMD布置位置、系统最优频率比与最优阻尼比的优化取值和减振效果等问题,提出了相应的设计建议,并通过数值算例进行了验证。更多还原

【Abstract】 With the trend towards more lighter and slender footbridges,the vibration serviceability is more critical in design.The tuned mass damper(TMD) has shown a high efficiency in reducing the excessive vibrations under dynamic loads induced by pedestrians.Based on the distributed parameter method,a general measure to calculate the dynamic response of a footbridge-STMD system or a footbridge-MTMD system is suggested.The efficacy of TMD in controlling footbridge vibration under walking loads is examined according to the root-mean-square acceleration,and the optimal placement and parameters of a TMD system are discussed.The proposed method is also verified by numerical examples.更多还原