胶合木-混凝土组合楼盖人行荷载激励下振动舒适度研究

Vibration serviceability of glulam-concrete composite floor under pedestrian excitation

为研究胶合木-混凝土组合楼盖在人行荷载激励作用下的振动舒适度,对胶合木-混凝土组合楼盖进行了动力特性试验,测得其基本自振频率和阻尼比等相关动力特征值,并对该楼盖施加了多种人行激励工况,分析了步频、行走路径、行人数量、行走荷载布置方式、行走方式等因素对胶合木-混凝土组合楼盖振动性能的影响。结果表明:随着步频的增大和行走人数的增加,组合楼盖的峰值加速度逐渐增大;多人保持一致行走状态下组合楼盖的峰值加速度较随意行走的大;当步频相同时,原地踏步时的组合楼盖峰值加速度较连续行走的大。在试验研究的基础上,提出了胶合木-混凝土组合楼盖基本自振频率以及单人行走下峰值加速度的计算方法。最后结合国内外相关规范,建议采用自振频率和峰值加速度的双重指标来评价胶合木-混凝土组合楼盖振动舒适度,即楼盖的自振频率不小于15 Hz,峰值加速度不大于0.15 m/s^2。

In order to investigate the vibration serviceability of glulam-concrete composite floor,this paper conducted dynamic performance test to obtain the fundamental frequency and the damping ratio of the composite floor.The vibration response of the composite floor under pedestrian excitation was analyzed with consideration of step frequency,walk path,the number of pedestrians,distribution of walking loads and walking mode.The test results show that the peak acceleration of composite floor increases with the step frequency and the number of pedestrians.The peak acceleration of composite floor under regular walking is larger than that of composite floor under irregular walking.With the same step frequency,the peak acceleration of composite floor under the same spot walking is larger than that of composite floor under normal walking.Based on the experimental research,the calculation methods for predicting the fundamental frequency and peak acceleration of glulam-concrete composite floor under single walking were proposed.Based on the related domestic and foreign codes,it is suggested that the indexes of both fundamental frequency and peak acceleration are used to evaluate the vibration serviceability of glulam-concrete composite floor.The fundamental frequency of floor should not be less than 15 Hz,and the peak acceleration should not be more than 0.15 m/s^2.