大型超高钢结构电视塔模拟地震振动台试验研究
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摘要
通过对大型超高钢结构电视塔1/40整体模型模拟地震振动台试验,测试了模型结构的动力特性,及其在8度多遇、8度基本以及8度罕遇烈度地震作用下的阻尼比、频率变化和塔楼顶部位移,并根据试验结果和相似理论,分析了原型结构的地震反应。试验及分析结果表明,原型结构前三阶自振频率为0.303 Hz(X向平动)、0.317 Hz(Y向平动)和0.625 Hz(扭转),对应的振型周期依次为3.3 s、3.15 s和1.6 s,其扭转周期与前两阶平动周期的比值分别为0.48和0.51,且在8度多遇和罕遇地震作用下结构最大层间位移角分别为1/807和1/99,表明原型结构整体抗震性能较好,能够抵抗所在地区设防烈度下各水准地震作用。
A series of earthquake simulation tests were carried out on a shaking table with different waves and different earthquake levels for 1/40 model of a super high steel TV tower.Its dynamic properties,seismic responses,damping ratios and the variations of the natural frequency under different wave peaks were studied.The seismic responses of the prototype structure were studied based on the similitude theory.With the data achieved in the test,the first three frequencies of the structure are 0.303Hz(translation in direction X),0.317Hz(translation in direction Y),and 0.625Hz(torsion), the corresponding periods are 3.3s,3.15s and 1.6s.The ratio of period of the torsion to those in two horizontal directions are 0.48 and 0.51,the maximum inter-story drifts under frequently occurred earthquake and seldom occurred earthquake are 1/807 and 1/99,the results indicate that the structure has a good earthquake-resistant behavior,and can satisfy the requirement of the building code.
A series of earthquake simulation tests were carried out on a shaking table with different waves and different earthquake levels for 1/40 model of a super high steel TV tower.Its dynamic properties,seismic responses,damping ratios and the variations of the natural frequency under different wave peaks were studied.The seismic responses of the prototype structure were studied based on the similitude theory.With the data achieved in the test,the first three frequencies of the structure are 0.303Hz(translation in direction X),0.317Hz(translation in direction Y),and 0.625Hz(torsion), the corresponding periods are 3.3s,3.15s and 1.6s.The ratio of period of the torsion to those in two horizontal directions are 0.48 and 0.51,the maximum inter-story drifts under frequently occurred earthquake and seldom occurred earthquake are 1/807 and 1/99,the results indicate that the structure has a good earthquake-resistant behavior,and can satisfy the requirement of the building code.
引文
[1]王肇民,马人乐.塔式结构[M].北京:科学出版社,2004.
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[2]Zhou Ying,Lu Xilin,Lu Wensheng.Shaking Table Test and Numerical Analysis on a Complex High-rise Building[C]. Proceedings of the Third International Conference on Earthquake Engineering,2004,355-362.
[3]邹昀,吕西林,卢文胜.上海环球金融中心大厦整体结构振动台试验设计[J].地震工程与工程振动,2005,25 (4):54-59.
[4]龚治国,吕西林,卢文胜.混合结构体系高层建筑模拟地震振动台试验研究[J].地震工程与工程振动,2004,24 (4):99-105.
[5]JennShin Hwang,Ting-Yu Hsu.Experimental Study of Isolated Building under Triaxial Ground Excitations[J].Journal of Structural Engineering.,Volume 126,8,879 - 886.
[6]施卫星,丁美,成广伟,等.超限高层建筑整体模型模拟地震振动台试验研究[J].四川大学学报(工程科学版),2007,39(4):50-56.
[7]Lee Han-Seon,Ko Dong-Woo.Seismic response characteristics of high-rise RC wall buildings having different irregularities in lower stories[J].Engineering Structures,2007,29 (11 ):3149 - 3167.
[8]Lu X L,Chen Yue,Lu Wensheng et al.Shaking Table Model Test on a Super Tall-Building with High Level Transfer Story[J].Proceedings of the Second International Conference on Advances in Experimental Structural Engineering,2007, 362 - 371.
[9]Lu X L,Zhang H Y,Hu Z L,et al.Shaking table testing of a U-Shaped plan building model[J].Canadian Journal of Civil Engineering,1996,26:746 - 759,
[10]GB 50011-2001建筑抗震设计规范[S].中国建筑工业出版社,2001.
[11]JGJ 3-2002高层建筑混凝土结构技术规程[S].
[12]He M J,Ma R,Zhao lin.Design of Structural Vibration Control of a Tall Steel TV Tower under Wind Load[J].Steel Structures,2007,7:85 - 92.
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