摘要
对景观塔的结构选型与减震方案比选进行了阐述,研发了一体化两级变阻尼电涡流调谐质量阻尼器,模拟了脉动风和横风共振时风速时程,对有控和无控结构进行了脉动风与横风共振作用下风振响应分析,得到了调谐质量阻尼器(TMD)在10,50,100年脉动风与横风共振作用下的减振效果。进行了振动台试验,验证了结构选型的合理性。结果表明:景观塔结构能有效抵御脉动风,但10年脉动风与横风共振作用下,结构顶层不满足舒适度要求;两级变阻尼电涡流调谐质量阻尼器能有效控制脉动风和横风共振作用下的结构响应,减振效果随楼层的增高而增大。设置TMD后,10年脉动风和横风共振作用下,顶层位移分别减小34.3%,82.5%,顶点加速度分别减小42.9%,80.8%;50年脉动风作用下,楼层位移和顶层加速度最大分别减小43.04%,32.44%;100年脉动风作用下,楼层位移和顶层加速度最大分别减小32.23%,23.23%。航管塔、气象塔等要求高的高耸结构,适合用TMD的减振措施。高宽比大的高耸结构采用TMD减振满足舒适度要求时,结构选型应优先选择第一振型参与系数高的结构体系。
The structural system selection and vibration reduction scheme selection of a landscape tower were described.An integrated two-stage variable damping eddy current tuned mass damper(TMD)was developed,and the wind speed time history of the fluctuating wind and the transverse wind resonance were simulated.The wind vibration response of the controlled and TMD control structures under the fluctuating wind and the transverse wind resonance was analyzed.The damping effects of the TMD under the resonance of fluctuating wind and transverse wind for 10,50 and 100 years were obtained.Shaking table tests were carried out to verify the rationality of the structure selection.The results show that the landscape tower structure can resist the fluctuating wind effectively,but the top of the structure does not meet the comfort requirements under the fluctuating wind and the transverse wind resonance for 10 years.The two-stage variable damping eddy current tuned mass damper can effectively control the structural response under the action of fluctuating wind and transverse wind resonance,and the damping effect increases with the increase of floors.After setting TMD,the top displacement decreases by 34.3%and 82.5%,and the top acceleration decreases by 42.9%and 80.8%,respectively,under the resonance of fluctuating wind and transverse wind for 10 years.Under the action of 50 years of fluctuating wind,the maximum floor displacement and top acceleration decrease by 43.04%and 32.44%,respectively.Under the action of 100 years of fluctuating wind,the maximum floor displacement and top acceleration decrease by 32.23%and 23.23%respectively.The high-rise structure of air traffic control tower,meteorological tower,etc.with high requirements is suitable for the vibration reduction measures of TMD.When the high-rise structure with high aspect ratio adopts TMD to reduce vibration and meet the requirements of comfort,the structural system with high participation coefficient of the first mode should be preferred.
作者
区彤
林松伟
刘彦辉
周福霖
OU Tong;LIN Songwei;LIU Yanhui;ZHOU Fulin(Guangdong Architectural Design&Research Institute Co.,Ltd.,Guangzhou 510010,China;Earthquake Engineering Research and Test Center,Guangzhou 510405,China)
出处
《建筑结构》
CSCD
北大核心
2021年第13期139-144,51,共7页
Building Structure
基金
国家自然科学基金项目(51778163)
国家重点研发计划重点专项(2017YFC0703601)。
关键词
景观塔
两级变阻尼
调谐质量阻尼器
减振
舒适度
landscape tower
two-stage variable damping
tuned mass damper
vibration reduction
comfort
