Power spectral density model for pedestrian walking load and its application

被引：0
|
作者：
Chen J. [1 ,2 ]
Wang J. [1 ]
Xiong J. [1 ]
机构：
[1] College of Civil Engineering, Tongji University, Shanghai
[2] State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2019年 / 40卷 / 09期
关键词：
Power spectral density; Stochastic vibrations; Vibration serviceability; Walking load;
D O I：
10.14006/j.jzjgxb.2017.0432
中图分类号：
学科分类号：
摘要：
Deterministic models of pedestrian walking load proposed on the basis of Fourier series neglect the stochastic characteristics of human walking, and will overestimate dynamic responses at resonance case of structures like footbridges and long-span floors. In this paper, pedestrian walking load is regarded as a stochastic process. Based on the analysis of 1 007 load records collected from an experiment, a power spectral density (PSD) model for the first four harmonics and sub-harmonics within a certain frequency range around each harmonic is proposed. The PSD is normalized step by step to pedestrian body weight, energy of each harmonic, mean pacing rate and order of each harmonic, and the PSD models for harmonic and sub-harmonic are suggested as two-term Gaussian functions fitting with four parameters obtained from the statistical analysis of the experimental data. Via stationary and non-stationary stochastic vibration theory, the proposed PSD model is used to predict the vertical structural acceleration response. The framework is finally tested via field measurements on a 10 m×6 m floor model and a long-span floor of a train station. It is indicated that the model is reasonable in practical design work. © 2019, Editorial Office of Journal of Building Structures. All right reserved.
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页码：166 / 174
页数：8
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