某项目大跨度钢结构连体楼盖减振分析  

Vibration Analysis of Long-span Steel Structure Integrated Floor Slab of a Project

作　　者：李希锴 LI Xikai(Guangdong Architectural Design&Research Institute Co.,Ltd.Guangzhou 510010,China)

机构地区：[1]广东省建筑设计研究院有限公司,广州510010

出　　处：《广东土木与建筑》2023年第6期87-89,共3页Guangdong Architecture Civil Engineering

摘　　要：项目位于广东省肇庆市高新区,其中两栋为连体结构,主体高度47.3 m,且连体部位跨度约30 m。主体结构采用钢筋混凝土结构,连体部分采用钢结构。由于连体跨度较大,大跨度钢结构楼盖也存在着竖向刚度较弱、自振频率较低、易受人行荷载激励等问题,影响了楼盖的振动舒适度。故通过有限元软件计算分析,来判断其舒适度。在舒适度不满足相关规范要求时,通过设置调谐质量阻尼器(TMD)的方法,以达到抑制人行荷载作用下的楼板振动。最后通过理论分析和数值模拟,对不同调谐质量阻尼器(TMD)的布置方案的减振效果进行了比较和评估,得出结论:TMD的布置应结合楼板的实际振动频率及布置TMD后的振动频率确定,并尽量布置在跨中位置,减振效果最好。The project is located in the high-tech zone of Zhaoqing City,Guangdong Province.Two buildings are connected in the project,with a main body height of 47.3 meters and a connected span of approximately 30 meters.The main structure adopts reinforced concrete structure while the connected part adopts steel structure.Due to the large span of the conjoined structure,large-span steel structural floors also suffer from weak vertical stiffness,low natural frequency,and susceptibility to pedestrian loads,which affects the vibration comfort of the floor.Therefore,finite element software is used to calculate and analyze the comfort level.When the comfort level does not meet the relevant code requirements,a tuned mass damper(TMD)is installed to suppress floor vibrations caused by pedestrian loads.Finally,theoretical analysis and numerical simulation are used to compare and evaluate the vibration reduction effect of different TMD placement schemes,It is concluded that the layout of TMD should be determined by combining the actual vibration frequency of the floor slab and the vibration frequency after the TMD arrangement,and try to arrange it in the middle position of the span,and the vibration damping effect is the best.

关 键 词：舒适度 调谐质量阻尼器 大跨度楼盖 楼板振动 减振设计 

分 类 号：TU318.2[建筑科学—结构工程]