摘要
人群中每个行人简化为一个集中质量和两个弹簧阻尼器腿的模型,利用拉格拉日方程建立了多人行走状态下的人群-结构相互作用模型。首先利用该模型研究了人群引起结构的响应和人群-结构系统的模态特性改变,然后分析了结构响应和系统模态随着人群数量的变化而改变,最后比较了在队列和并排两种不同行走状态下人群结构系统的响应和模态特性的变化。数值分析表明结构的响应和模态特性随着人群数目增加而变化增大,然而行人在结构上分布较为均匀的纵向行走方式能够有效降低结构的响应,为减轻结构的剧烈波动,在人行桥设计时建议采用窄的截面宽度或者在桥面上设置纵向疏导设施以避免人流集中对结构的不利影响。
Each pedestrian was simplified as a lump mass and two spring-damper legs and a walking crowd-structure interaction （CSI）model was established using Lagrange＇s equations.First of all,the structural responses and dynamic characteristics of the crowd-structure system were studied.Secondly,the structural responses and the modal changes versus the number of people were analyzed.Finally,under two different walking styles including queue and side by side,different structural responses were compared.The simulation analysis showed that the changes of the structural response and modal features of the crow-structure system increase with increase in number of people;however,the walking style of queue with a more uniform crowd distribution can effectively reduce dynamic responses of the structure;in order to avoid resonance or excessive fluctuation,a narrow cross-section and longitudinal dredging facilities on a bridge deck are recommended for footbridge designs.
出处
《振动与冲击》
EI
CSCD
北大核心
2016年第23期153-159,共7页
Journal of Vibration and Shock
基金
国家自然科学基金重大研究计划重点支持项目(51338001)
关键词
数值模拟
人群-结构相互作用
模态特征
结构响应
人群行走方式
numerical simulation
crowd-structure interaction
modal characteristics
structural response
walking styles of crowd
