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。
Abstract
Each pedestrian is simulated as a lump mass and two spring-damper legs and walking crowd-structure interaction (CSI) model is established employing the Lagrange’s equations. First of all, the structural response and dynamic characteristics of crowd-structure system are studied. Second, the crowd number inducing structural response is analyzed. Finally, two different walking styles including queue and side by side inducing different structural response are researched. The simulation analysis shows that the change of structural response and crow-structure system’s dynamic characteristics are increased along with the increment of crowd number. However, the walking style of queue occupying a more uniform distribution crowd density can effectively reduce the response of structure. In order to avoid resonance or exceed fluctuation, the narrow cross section and longitudinal dredge facilities on the deck is recommended to applying the footbridge design.
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
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Key words
numerical simulation /
crowd-structure interaction /
modal characteristics /
structural response /
walking styles of crowd
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