大跨度齿板连接木桁架搁栅楼盖竖向振动性能试验研究  

Experimental study on vertical vibration performances of large-span metal plate connected timber truss joist floors

作　　者：张占宜 王双永[1,2] 沈银澜 周海宾 ZHANG Zhanyi;WANG Shuangyong;SHEN Yinlan;ZHOU Haibin(Research Institute of Wood Industry,Chinese Academy of Forestry,Beijing 100091,China;National Engineering Research Center of Wood Industry,Beijing 120300,China;Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]中国林业科学研究院木材工业研究所,北京100091 [2]木材工业国家工程研究中心,北京120300 [3]北京工业大学建筑工程学院结构所,北京100124

出　　处：《建筑结构》2024年第2期121-128,共8页Building Structure

基　　金：国家自然基金面上项目(31770603)。

摘　　要：为研究齿板连接木桁架搁栅楼盖的人致振动响应,对12m跨度齿板连接木桁架搁栅楼盖振动性能进行了足尺试验研究,分析了横撑和隔墙对木楼盖振动特性、楼盖刚度的影响,分析了单人步行荷载和自由落体冲击荷载作用下木楼盖的振动响应。结果表明:木楼盖前三阶振型符合预期,单跨木楼盖的基本自振频率在8Hz以下,低于连跨形式木楼盖的基本自振频率;安装横撑和设置隔墙都可以增加木楼盖的前三阶频率;在不同位置安装横撑均可提高木楼盖的刚度,减小木楼盖的静态挠度,均匀安装4排横撑可将楼盖中心静态挠度降低47.5%;不同方向步行荷载激励下木楼盖的振动响应略有不同,纵向行走而致的振动响应较大,横向较小,安装隔墙后木楼盖中心的振动响应能降低40%左右;木楼盖的纵向振动传递大于横向和斜向两个方向,安装隔墙有助于木楼盖振动的传递。In order to study the human-induced vibration response of metal plate connected timber truss joist floor,a full scale test was carried out on the vibration performance of 12m span metal plate connected timber truss joist floor.The effects of the cross brace and partition wall on the vibration performance and stiffness of timber floor were analyzed,and the vibration response of timber floor under single walking load and free fall impact load was analyzed.The results show that the first three vibration modes of the timber floor meet the expectation.The basic natural vibration frequency of the single span timber floor is below 8Hz,which is lower than the basic natural vibration frequency of the continuous span timber floor.The frequency of the first three levels of timber floor can be increased by installing cross brace and setting partition wall.The stiffness of timber floor increases,and static deflection reduces after incorporating cross brace at different positions.Static deflection at the center of timber floor is reduced by 47.5%when 4 rows of cross brace are added.The vibration response of timber floors to human-induced loads in different directions varies slightly,with a larger response in the longitudinal direction and a smaller response laterally.The vibration response at the center of timber floor is reduced by 40%after introducing partition wall.The longitudinal vibration transmission of timber floor surpasses that in horizontal and oblique directions.The setting of partition wall can enhance the vibration transmission of timber floor.

关 键 词：大跨度齿板连接木桁架 木楼盖 振动模态 竖向振动 振动传递 横撑 

分 类 号：TU366.2[建筑科学—结构工程]