跳跃荷载作用下体育馆大跨预应力次梁楼盖振动模拟分析
Simulation analysis of long-span prestressed secondary beams floor system in gymnasium under jumping loads

以某小学体育馆为工程背景，通过ANSYS建立有限元模型，考虑不同跳跃频率、跳跃人数和跳跃次数的荷载作用，对大跨度预应力混凝土次梁楼盖结构进行竖向振动模拟分析，并进行现场实测，结果表明：修正半正弦平方荷载模型模拟单人跳跃荷载所得分析结果与实测值相对误差为12.98%，比较接近；多人同步跳跃所导致的楼盖竖向振动加速度随人数的增加而增加，近似呈正比关系；考虑多人跳跃难以严格同步，引入倍增因子对跳跃荷载模型进行修正，与实测值验证较为接近。
A stadium of primary school was taken as an example, by establishing the finite element model with ANSYS, the vertical vibration of long-span prestressed secondary beams floor system worked with different jumping frequency, number of persons and jumping numbers were analyzed. The results show that, compared with the measured values, the modified half-since-power model has a relative error of 12.98%, which is closed to the measured values; vertical vibration acceleration caused by different people jumping synchronously increases with number of persons rising; considering the people can't jump synchronously the multiplication factor is introduced to correct the jumping loads model.