随机人群运动荷载作用下大跨度连廊的振动响应

基于社会力模型，研究了随机人群运动荷载作用下大跨连廊结构的振动舒适度问题。通过结合交通学领域、生物力学领域对人群运动特性及人体运动参数的统计分析，对随机人群运动进行仿真，得到不同密度工况下，任意行人在任意时刻的步速、落点位置等参数，建立随机人群荷载模型，计算不同工况密度下结构的加速度峰值。研究表明，加速度峰值与行人步速关系很大，随着行人密度增大，行人速度减小，结构加速度响应则先增大后减小。根据得到的结构加速度峰值与行人密度关系曲线，可以找出出现结构振动舒适度问题的行人密度区间。

Vibration response of long-span corridor under stochastic crowd load

Based on social force model which is combined statistics and analysis of crowd motion characters and body motion parameters in the field of transportation and biodynamic, vibration comfort of long-span corridor under stochastic crowd load is studied and stochastic crowd motion is simulated.The critical parameters such as pace and landing position are obtained in different densities, the stochastic crowd model is built and the peak acceleration is calculated.The study shows, peak acceleration is closely related to the pacing frequency, and pedestrian velocity becomes large along with increase of pedestrian density while the acceleration response of structure increased initially and then decreased. By the relationship curve of structure peak acceleration and pedestrian density the pedestrian density interval in which the structure suffering vibration serviceability problems can be found.