楼板尺寸对振动舒适度影响研究

Study on the Influence of Floor Size on Vibration Comfort

主要研究楼板尺寸大小对大跨度楼板振动舒适度影响。研究单跨楼板在长宽比和厚度这两个因素影响下振动舒适度变化。分别建立单跨楼板的理论模型和有限元模型,改变楼板尺寸参数,进行模态分析得到自振频率。在自振频率的基础上施加行人荷载,并引入计权加速度arw用于评价不同尺寸的楼板响应。发现在行人荷载作用下楼板长宽比为1时楼板计权加速度响应最大;楼板平面面积越大产生的计权加速度越大;楼板厚度越大产生的计权加速度越大。最后拟合楼板边长与厚度的关系,得到基于结构设计规范的楼板边长和厚度的关系式。

This paper mainly studies the influence of floor size on the vibration comfort of long-span floor.In this paper,the change of vibration comfort of single-span slab under the influence of aspect ratio and thickness is studied.The theoretical model and finite element model of single-span slab are established respectively.The slab size parameters are changed and the natural frequency is obtained through modal analysis.The pedestrian load is then imposed on the basis of the natural frequency and the weighted acceleration is introduced to evaluate the floor response of different sizes.It is found that under the pedestrian load,the floor weighted acceleration response is the largest when the aspect ratio is 1;The larger the flat area of floor is,the greater the weighted acceleration generated by the effects of pedestrian loads is;the bigger the thickness of floor is,the greater the weighted acceleration generated by the effects of pedestrian loads is.In the end,the relationship between the length and the thickness of the floor is fitted,and the relationship between the length of the floor and the thickness of the floor is obtained based on the structural design specifications.