驻留人群-结构耦合体系竖向动力特性

为研究人-结构竖向相互作用中驻留人体模型的适用性，基于质量-弹簧-阻尼（mass-spring-damper , MSD），质量-弹簧-阻尼-附加质量（mass-spring-damper-added mass , MMSD）和刚性质量（rigid mass ,MR）三类人体模型，建立了人群-梁耦合体系动力方程，分析了单人作用位置以及人群数量对耦合体系动力特性的影响，以加速度峰值和均方根加速度为指标，评估了三种模型对振动响应的敏感程度。结果表明：MMSD模型和MSD模型对耦合体系动力特性的影响趋势一致，但结果的相对误差会随人群密度的增加而放大；MR模型对体系前两阶频率作用相同，对模态阻尼比的影响可忽略不计，不适用于人-结构相互作用分析中；三种简化模型均降低了体系振动水平，合理考虑驻留人体对耦合体系动力特性的影响可提高结构振动分析精度。

Study on Vertical Dynamic Characteristics of Crowd-Structure Coupling System

In order to study the applicability of resident body model in vertical human-structure interaction, based on MSD, MMSD and MR three kinds of human models, the dynamic equation of crowd-beam coupling system was established. The influence of single-person action position and population number on the dynamic characteristics of coupled system was analyzed. Taking peak acceleration and root mean square acceleration as indexes, the sensitivity of three models to vibration response was evaluated. The results show that the influence of MMSD model and MSD model on the dynamic characteristics of coupled system is consistent, but the relative error of the results will be amplified with the increase of population density. The MR model has the same effect on the first two frequencies of the system, and the effect on the modal damping ratio can be ignored, which is not suitable for the analysis of human-structure interaction. Three simplified models all reduce the vibration level of the system. Reasonable consideration of the influence of resident human body on the dynamic characteristics of the coupled system can improve the accuracy of structural vibration analysis.