摘要
以生物力学和交通领域相关研究成果为基础,提出了一种精细化的随机人群荷载作用下的人致结构振动分析方法.首先以生物力学试验数据为基础,拟合了人步行速度与步频之间的关系式;然后借助交通领域的人流集度与人流速度关系模型,结合目前结构领域关于单人荷载模型的研究成果,建立了精细化的随机人群荷载模型,推导了该人群荷载模型下的结构动力平衡方程,并采用自编程序对该方程进行求解,得出了结构的人致响应;最后通过ISO2031标准对文中建立的荷载模型下结构的人致振动舒适性进行评价,并与BS5400荷载模型进行了比较.结果表明,文中所建立的荷载模型较好地考虑了人群荷载对结构的作用,避免了目前人群荷载作用下人致振动分析参数取值的盲目性.
Proposed in this paper is a refined analysis method of human-induced vibration under walking-crowd excitation,which is based on the researches on biomechanics and transportation.In this method,first,the walking speed-frequency relation is derived by fitting the experimental data in biomechanics.Then,the relationship between the speed and the density of crowd flow is investigated according to the corresponding transportation model.Moreover,a refined random crowd load model is established based on the speed-density relationship and the single-human load model in structure field,according to which a dynamic balance equation is deduced and solved using a self-compiled program,with the human-induced vibration response of the structure being obtained.Finally,the comfort of the structure under walking-crowd excitation is evaluated according to the ISO2631 standard,and the results are compared with those obtained by the BS5400 model.It is demonstrated that,as the proposed load model fully considers the crowd load,it avoids the blindness in parameters selection during the human-induced vibration analysis.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第4期125-130,共6页
Journal of South China University of Technology(Natural Science Edition)
基金
高等学校博士学科点专项科研基金资助项目(20050247029)
关键词
人致振动
人群荷载模型
步频
人流集度
人流速度
human-induced vibration
crowd load model
step frequency
crowd density
crowd velocity
作者简介
李昊（1980-），女，博士生，主要从事桥梁结构理论及桥梁有限元程序设计研究．E-mail：rotin—lh@126．com
