Through tests,900 groups of three-dimensional pedestrian loading curves were obtained during human walking up and down stairs,using Fast Fourier transformation,the distribution law of each harmonic component's dynamic loading factor was obtained and the obvious discrete distribution of phase angle was indicated.And then using the wavelet transformation,each single load time-frequency plot was gained to reflect the variability of walking frequency during human walking.Finally,the load induced by human on floors was compared with the load during human walking up and down stairs in terms of walking frequency,amplitude and other parameters,and the load parameters during human walking up stairs were compared with those during human walking down stairs.It was shown that the pedestrian load during human walking up stairs is at least 150% of the load induced loy human on floors and the pedestrian load during human walking down stairs is more than 300% of the load induced by human on floors.%对试验获得的900组三向楼梯荷载时程，采用快速傅里叶变换，统计出各阶谐波动力荷载因子的分布规律并指出相位角的分布具有很大的离散性。采用小波变换得到单条荷载曲线的时频图，可以反映出人在行走过程中行走频率的变异性。最后将上下楼梯时人行荷载与已完成的楼板荷载就行走频率、幅值等参数进行比较，并将上楼梯与下楼梯的荷载参数进行比较，发现上楼梯时的人行荷载至少是楼板上荷载的150％，下楼梯时是楼板荷载的300％之多。
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