障碍物设置对人群荷载作用下连廊的减振控制

Vibration control of corridor under crowd load by setting obstacles

研究了人群荷载作用下设置障碍物对连廊的减振控制。从考虑行人视线和障碍物作用区域两方面对传统社会力模型进行了改进,并对人群运动进行了仿真模拟。建立了人群荷载下连廊的振动控制方程,并进行动力响应求解。以某商贸城的钢结构连廊为算例,探讨了障碍物对人群速度等运动特性的改变,进一步对设置障碍物连廊的振动响应进行了分析,并从能量的角度阐述了减振机理。算例表明,布置障碍物后,行人平均步速最大下降率为9.1%;减振率随着障碍物数量的增加升高,多数工况减振率达到10%以上,最高减振率能达到30%;输入到结构上的能量明显降低,并且下降率与障碍物数量正相关。

This study presents the vibration control of corridors under the crowd load by setting obstacles.In this study,the classic social force model is improved by considering the pedestrian sight and obstacle domain,and the crowd movement is simulated to apply the improved model.The governing equation of corridor vibration under the crowd load is established and solved.The steel structure corridor of a shopping mall is taken as an example.The crowd movement characteristics,such as crowd velocity,are discussed by setting obstacle and the vibration response of corridor is analyzed.The vibration reduction mechanism of the structure is explained from the point of view of energy.The numerical results show that the maximum decrease rate of pedestrian’s average walking speed is 9.1%when the obstacles are laid out.The higher the vibration reduction rate is with the increase of the number of obstacles.In most cases,the vibration reduction rate can reach more than 10%,and the maximum vibration reduction rate can reach 30%.The energy input to the structure is significantly reduced,and the reduction rate is positively correlated with the number of obstacles.