A spectral density approach for modelling continuous vertical forces on pedestrian structures due to walking
A spectral density approach for modelling continuous vertical forces on pedestrian structures due to walking
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DOI：
10.1139/l03-072
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发表时间：
2004
影响因子：
1.4
通讯作者：
J. Brownjohn;A. Pavic;P. Omenzetter
中科院分区：
文献类型：
--
作者：
J. Brownjohn;A. Pavic;P. Omenzetter
现有的步行模型用于振动舒适性评估的结构进行行人通常是基于测量的单脚步重复精确的时间间隔。这种假定的完美周期性允许步行力基于步行速度及其整数倍被建模为傅立叶级数。本文探讨了真实的连续步行力从仪表跑步机和他们的随机缺陷的影响，通过时间模拟的结构响应，并表明有显着差异的反应，由于不完美的真实的步行力和等效的完美的周期性模拟。这些差异对于模拟振动响应被高估的高次谐波最为显著。由于不完美行走的现实表示是自谱密度函数，随机特性自然导致在频域中应用随机方法来处理行人载荷。AP…
Existing walking models used for vibration serviceability assessment of structures carrying pedestrians are typically based on measurements of single footfalls replicated at precise intervals. This assumed perfect periodicity allows walking forces to be modelled as a Fourier series based on the walking pace and its integer multiples. This paper examines real continuous walking forces obtained from an instrumented treadmill and the effect of their random imperfections through time simulations of structural response and shows that there are significant differences between responses due to the imperfect real walking forces and the equivalent perfectly periodic simulation. These differences are most significant for higher harmonics where the simulated vibration response is overestimated. As a realistic representation of imperfect walking is an auto-spectral density function, the random character naturally leads to a stochastic approach to treatment of pedestrian loading applied in the frequency domain. The ap...