Measuring and Modeling Dynamic Loads Imposed by Moving Crowds
Measuring and Modeling Dynamic Loads Imposed by Moving Crowds
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DOI：
10.1061/(asce)0733-9445(1996)122:12(1468
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发表时间：
1996-12
期刊：
影响因子：
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通讯作者：
A. Ebrahimpour;A. Hamam;R. Sack;W. Patten
中科院分区：
文献类型：
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作者：
A. Ebrahimpour;A. Hamam;R. Sack;W. Patten
现代柔性结构的过度振动和偏转可以由人群运动施加。使用一个专门设计的，大型的，仪表化的力量平台，由六个独立的蜂窝板组成的移动人群，而步行产生的动态力进行了测量。实验是针对个人和两人和四人的小组进行的。使用线性回归模型对足迹载荷-时间历史进行统计学表征。使用影响个人脚步的实验参数和一组人之间的一致性随机模拟组负载。组负荷模型的准确性进行了验证，通过频域比较的模拟和测量数据的四人组。基于所提出的工作，荷载模拟为大人群和设计活荷载的建议下，乘员步行活动的结构正常使用要求。设计活荷载随脚步频率和人群规模而变化。
Excessive vibrations and deflections of modern flexible structures can be imposed by crowd movements. Dynamic forces generated by moving crowds of people while walking were measured using a specially designed, large, instrumented force platform consisting of six independent honeycomb plates. Experiments were conducted for individuals and groups of two and four people. A linear regression model was used to statistically characterize the footstep load-time history. Group loads were randomly simulated using the experimental parameters affecting individual footsteps and the coherency among the people in a group. The accuracy of the group load model is verified by frequency-domain comparison of simulated and measured data for groups of four people. Based on the work presented, loads are simulated for large crowds and design live loads are suggested for structural serviceability requirements under occupant walking activities. The design live loads vary both with footstep frequency and the size of the crowd.