步行荷载激励下大跨度楼盖加速度反应谱分析

Acceleration response spectrum analysis of large span floor under pedestrian load

首先介绍了运用数值分析方法研究加速度反应谱的基本思路,并指出该方法的不足;然后针对加速度是楼盖人致振动控制和舒适度评价的重要指标,采用APDL建立大跨度楼盖在标准行人激励下的有限元计算模型,对不同自振频率的楼盖模型进行动力时程分析,得到楼盖的最大加速度反应谱曲线;最后分析了测点位置、阻尼、跨度及行人数量对楼盖加速度的影响,与部分学者推荐的研究结果进行比较分析.结果表明:有限元分析方法可以消除数值分析时用挠曲函数代替横向位移反应产生的误差;该方法解决了用第1振型加速度响应代替结构的加速度响应,导致预测的结构振动响应结果偏小的问题.

Acceleration response spectrum research in numerical analysis method was introduced,and the defect was pointed out. By APDL,the long-span floor finite element calculation model was established based on standard pedestrian excitation load mode,and the maximum acceleration response spectrum curve was obtained by a large number of time history analysis calculation. The effects of detecting position,damping,span and pedestrians on the acceleration of floor were analyzed and compared with recommending results of some scholars. The results show that the finite element analysis can eliminate the error due to the flexural function instead of horizontal displacement response during numerical analysis.The problem of small structure vibration response by using the first type vibration acceleration response instead of the acceleration response of the structure is solved by the proposed method.