人群行走激励的数值模拟及动力耦合作用研究  

Numerical simulation of crowd excitation and dynamic interaction with structure

作　　者：何浩祥[1] 纪金豹[1] 孔丹丹[2] 

机构地区：[1]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100022 [2]河北工业大学土木工程学院,天津300132

出　　处：《计算力学学报》2011年第1期53-58,共6页Chinese Journal of Computational Mechanics

基　　金：北京市自然科学基金(8093031);北京市教委科技计划(KM201010005022)资助项目

摘　　要：大跨轻柔结构需要考虑人群行走激励下的结构振动响应以及人体的舒适度。根据单步落足曲线,结合影响人群行走效应的因素如人群分布、行走频率及个体生理特征等,采用随机方法模拟人群行走激励。对不同的人群倍增因子计算方法进行了比较并提出改进建议。将人群等效为具有主体部分和耦合均布质量的时变动力模型,建立了梁板结构与移动人体相耦合的动力平衡方程及其解析表达式。按随机模拟法和耦合均布质量法确定人群荷载,采用逐步积分法对人群与结构的动力响应进行了研究和比较。结果表明本文提出的分析方法准确有效。It is necessary to study the structural vibration induced by crowd excitation and the human comfort in flexible and long-span structures.Crowd excitation is simulated by random method according to normal footfall force curve and other individual factors such as distribution of crowd,step frequency and physiological characteristics.Different methods for computing crowd multiplication factor are compared and improvement advice is presented.A time-varying dynamic crowd model which includes a main uniform parameters and coupling mass is established according to crowd characteristics.The dynamic coupling equations for structure and walking crowd are established and the analytical expression is given.The crowd excitation is determined by random simulation and coupling mass method,the dynamic interaction between crowd and structure is analyzed and compared.The results show that both the methods presented in this paper are comprehensive and accurate.

关 键 词：人行激励 梁板结构 人体动力模型 耦合运动方程 人群倍增因子 

分 类 号：TU973[建筑科学—结构工程]