摘要
广州新电视塔塔高610m,由一座高达454m的主塔和一个高156m的天线桅杆构成,建成后将是世界第一高电视塔。广州大学工程抗震研究中心试验室设计了一个1/50结构模型,并对其进行了多种地震波的49种工况下的振动台试验。测试了模型结构的动力特性、阻尼比及其各种地震作用下的加速度、位移、扭转和应变反映,分析了模型结构的破坏情况,并根据试验结果和相似理论,研究了原型结构的地震反应。试验及分析结果表明,模型结构第1阶、第2阶振型频率与原型结构计算换算频率相差15%―18%左右,第3阶、第4阶频率相差30%左右,其对应阻尼比依次为3.317%、2.277%、1.555%和1.259%,其扭转、平动第一周期比为0.211,且在多遇、设防烈度和罕遇地震作用下结构最大层间位移角平均分别为1/320、1/154和1/72,显示结构在经历多遇地震,设防烈度地震和罕遇地震作用后,结构总体上满足设计目标的抗震设防要求。
The Guangzhou New TV Tower has the height of 610m above ground, the main tower body height of 454m and an antenna height of 156m, the tallest TV tower in the world after construction. A 1/50 scale model of Guangzhou New TV Tower was tested on shaking-table under the action of 49 different earthquake ground motions in the Earthquake Engineering Research Test Centre at Guangzhou University. The model＇s dynamic properties, damping ratio, and responses to the acceleration and deformation at different earthquake levels have been obtained. Its cracking pattern has also been analyzed. According to the model test results, the seismic response of the prototype is discussed. It is noticed that the difference between the theoretical value and the experimental result of the frequencies is about 15%-- 18% for the first two modes, and about 30% for the 3rd and 4th modes, with a relative damping ratio of 3.317%, 2.2770, 1.555% and 1.259% respectively. Thus the ratio of the period of the first rotation mode and that of the first translation mode is 0.211. The maximum story drift angle of the prototype under frequent, seismic-force reduce design and rare earthquakes is 1/320, 1/154 and 1/72 respectively. This research demonstrates that the prototype can meet the requirements of aseismic design under frequent earthquakes, seismic-force reduce design earthquakes and rare earthquakes.
出处
《工程力学》
EI
CSCD
北大核心
2008年第11期78-85,共8页
Engineering Mechanics
