基于自激励人体模型的人-结构竖向相互作用研究

Vertical human-structure interaction based on a self-exciting human model

基于自激励人体模型,建立了考虑人-结构竖向相互作用下行人过桥运动方程,提出了考虑步频主谐和亚谐分量的单人步行力模型,并通过单人过桥试验对该模型进行了验证;分析了人-桥竖向相互作用的变化规律及影响因素。结果表明,人体步频亚谐可能与结构的基频相近,从而引起较大的结构响应;结构固有频率和人/结构质量比对人-结构相互作用影响较大,当结构频率与步频及其主谐波分量频率接近时,耦合效应最显著,其对人体足底力影响最大。随着人/结构质量比的增加,人-结构相互作用逐渐增强。

Based on a self-exciting human model,the motion equation of a footbridge was established in considering the vertical human-structure interaction and a walk force model was proposed in considering the main harmonic and subharmonic frequencies of walking. The model was verified by measuring the footbridge vibration responses caused by single person walking. The variation of vertical human-structure interaction and its influencing factors were analyzed. The results indicate that the walking subharmonic frequency may be close to the fundamental frequency of the structure,resulting in large structural responses. The natural frequency of the structure and the human/structure mass ratio have a great influence on the human-structure interaction. When the structural frequency is closer to the walking frequency or its main harmonic components,the coupling effect is significant and has the greatest impact on footfall forces. Moreover,with the increasing of human/structure mass ratio,the interaction will strengthen gradually.