楼板人致振动中单人行走荷载加载方法对比

Comparison of loading methods of floor vibration due to individual walking

采用APDL参数化编程,实现单人行走荷载的4种加载方法,并利用ANSYS瞬态动力分析软件,进行楼板振动数值分析.将数值模拟得到的楼板加速度峰值和均方根值与文献中的实测结果进行对比,分析了4种方法的优劣及适用性.结果表明:单步落足荷载加载模拟人行走作用下楼板振动时,不考虑双脚的重叠时间段得到的楼板加速度响应偏小,且误差较大;其他3种方法得到的楼板振动加速度峰值相差不大;傅里叶连续行走荷载在固定点加载得到的加速度均方根值,不能用来表征楼板舒适度;单人随机行走荷载加载与实际情况更为符合,是分析楼板振动响应较为精确的方法.

In this paper,four methods of human walking loading are modeled by APDL programming.And the acceleration of the composite slab specimen could be obtained using transient dynamic analysis in ANSYS.Compared with the laboratory experiment results,it can be found that the overlap time of individual walking must be considered in numerical stimulating.And the first method that applying Fourier series load function at mid-span is probably faster and easier to predict the peak acceleration in these four methods,but it has the limitations of not being used to evaluate the floor serviceability.Finally,considering the variation of step frequencies during walking,the fourth method is likely more consistent with the reality of human walking and provides more accurate results.