人群荷载作用结构响应特性分析  

Vibration response characteristics analysis of long-span composite floor under crowd loads

作　　者：汤腊平 谢伟平[1] 何卫[1] 章涛[1] Tang Laping Xie Weiping He Wei Zhang Tao(School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Chin)

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070

出　　处：《建筑科学》2017年第7期85-90,共6页Building Science

基　　金：国家自然科学基金资助项目(51508431);中国博士后科学基金面上项目(2015M582288)

摘　　要：以某大跨度钢-混凝土组合楼板模型为对象,采用蒙特卡洛法模拟随机人群荷载,人群荷载考虑随机步频和起步相位,分析了两类人群荷载作用结构响应特性。对人群随机行走,分析了不同人流量和随机步态参数(步频和起步相位)对结构动力响应的影响;对于人群节律性运动(跳舞和健身操等),分析了相位差、接触比和人群密度等因素对结构动力响应的影响。研究表明:对人群随机行走,N人随机行走下结构动力响应与单人响应满足N(1/2)倍关系,可以用来简化计算人群响应;人群简化为相同步频和相同起步相位将会过高估计结构响应。对人群节律性运动,简化为同相位运动会过高预测结构的响应;接触比越大,响应越小;节律性运动下结构响应与人群密度的关系同人群随机行走相同。Taking a large-span steel concrete composite slab model as the object,adopting the Monte Carlo method to simulate the random crowd loads,the structural response characteristics under two types of crowd load are analyzed. For the crowd random walk,the effect of different pedestrian flow and random gait parameters（ gait frequency and initial phase angle） on the dynamic response of the structure is discussed; for the crowd rhythmic activity,the impact of factors such as the phase difference,the contact ratio and the population density on the dynamic response of the structure is studied. The results show that： the vibration response of crowd random walk is N（1/2）（ N refers to the number of pedestrians） times than that of single walk,which can be used to simplify the calculation of crowd-induced response; if the gait frequency and initial phase are fixed,the structure response would be over estimate. As for the crowd rhythmic movement,the simplification of same phase motion makes the structure response overrated,and the bigger contact ratio causes smaller response. The relation between structure response and crowd density under rhythmic movement is the same as that under crowd random walk.

关 键 词：大跨度楼板 人群荷载 随机行走参数 振动响应 

分 类 号：TU312.1[建筑科学—结构工程]