大跨度楼面人群荷载作用响应分析  

Analysis of vibration responses of long-span floor under crowd loads

作　　者：张家华[1] 高承勇[1] 秦卫红[2] 惠卓[2] 林俊军[2] 

机构地区：[1]上海现代建筑设计(集团)有限公司,上海200041 [2]东南大学混凝土与预应力混凝土教育部重点实验室,江苏南京210096

出　　处：《建筑结构学报》2011年第11期177-182,共6页Journal of Building Structures

摘　　要：以某大跨度钢-混凝土组合楼板模型为对象,采用ANSYS程序进行动力时程分析,研究人群荷载作用下,荷载布置方式、结构阻尼比、楼板边界条件、楼板长宽比和人群步行方式等因素对大跨度楼面结构振动响应的影响,分析大跨度楼板的人群动力响应特性。研究结果表明:不利布载形式为中间板带附近布置人群荷载;楼板长宽比越大则楼面结构响应峰值越小;连续步行荷载作用的楼板振动响应大于原地踏步荷载的响应;楼板边界约束越强振动响应越小;增大阻尼比能显著减小人致振动。This paper studied the vibration response of the long-span floor under crowd loads by selecting the model of a steel-concrete composite floor slab as the research objective.With the help of the FEM software ANSYS,the human-induced vibration responses were calculated and compared,considering different cases of load arrangement,damping ratio,floor boundary conditions,length-width ratio of floor and so on.And the characteristics of the human-induced vibration responses of long-span floor were researched.The results indicate that the unfavorable live load distribution is that the crowd is on the middle plate of the floor.The less the aspect ratio of floor slab is,the less the peak response value is.The response of the floor slab under moving crowd load is bigger than that under stationary stepping load.The stronger the boundary of the floor slab is restrained,the less the vibration response of floor is.The damping ratio is favorable for reducing the vibration response of structure and so on.

关 键 词：大跨度楼板 人群荷载 有限元分析 振动响应 

分 类 号：TU312.1[建筑科学—结构工程]