同济大学图书馆中央大厅天桥振动舒适度研究

Study on the Vibration Comfort of the Pedestrian Bridge in Tongji University Library Central Hall

摘要: 根据脉动法原理，通过实验利用SVSA振动信号采集分析系统获得了天桥结构竖向与侧向两个方向的振动响应，并对数据进行整理分析，得到了结构上两个方向的第一、二阶自振频率与阻尼比。分别利用频率控制法和限制动力响应法对结构的振动舒适度进行评价，实验结果均满足规范要求。但由于自振频率接近规范限值，人行荷载仍有可能引发结构共振；同时室内天桥处于安静环境，与规范适用情况有一定差别。因此此类结构物仍需提高振动控制标准。

Abstract: The study conducted an experiment to obtain the vibration response of the bridge structure in two directions of vertical and lateral directions with the SVSA vibration signal acquisition and analysis system according to the principle of pulsating method, and obtained the first and the second order natural frequencies and damping ration in two directions. Evaluating the structure’s vibration comfort with the frequency control method and the restricted dynamic response method, all the experimental results meet the requirement of relevant specification. However, since the natural frequencies are close to the limitation of specification, pedestrian load still may cause structural resonance; meanwhile, there is a certain difference between the experiment and the specification because the pedestrian bridge is in a quiet environment during the experiment. Therefore, it is necessary to improve the vibration control standard.