以生物力学和交通领域相关研究为基础，提出了一种精细化的随机人群荷载作用下的人致振动分析方法。该方法首先以生物力学领域试验数据为基础，拟合人步行速度与步频之间的关系式，采用交通领域研究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，建立精细化的随机人群荷载模型，推导该人群荷载模型下的结构动力平衡方程，采用自编程序对该方程进行求解，得出结构的人致响应。最后通过ISO2031标准对结构的人致振动舒适性进行评价。本文所建立的荷载模型，可以较好的考虑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..