L形高层隔震结构扭转影响参数分析
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摘要
通过分析不规则L形高层结构在不同输入方向地震波下的振动特性,对不隔震设计以及不断优化隔震层偏心率的隔震设计下研究了楼层最不利位移比变化规律。建立高层隔震结构运动方程,并推导了偏心率的求解过程,基于结构偏心率与位移比的上述理论计算,用ETABS软件对5个算例进行了分析。结果表明:偏心率的变化对于不规则L形高层结构的扭转影响同一般规则结构相似,具有相同的规律。隔震设计能够有效改善不规则L形结构的严重扭转问题,同时随着隔震层刚心与上部结构质心的相对距离越来越小,即随着偏心率的减小,隔震设计下的结构楼层位移比也随之变小。因此,在不规则结构的隔震设计中,在满足隔震层设计要求下,应尽量减小偏心率,以保证减振效果和结构安全。
The dynamic behaviour of an irregular L-shaped high-rise base-isolation structure under different direction seismic waves has been analyzed.Then the most unfavorable displacement ratio variation between the non-isolation design and the isolation story design is studied with continuous optimizing eccentricity.The motion equation of a high-rise base-isolated structure is established and its eccentricity solving process is discussed,and based on the above theoretical calculations of the structural eccentricity and displacement ratio,5 examples are analyzed with ETABS.The results show that the effect of the eccentricity changes on the torsion of irregular L-shaped high-rise structure is similar with the general structure,they all have the simlar law.The isolation design can effectively improve the serious torsional problem in the irregular L-shaped structure.In the meantime,the structural displacement ratio decreases with the reduction of the spacing distamce between the stiffness centre of isotation layer and the mass centre of superstructure.So it's necessary to reduce the eccentricity under the condition of meeting isolation design requirements so as to make sure of damping effect and structural safety during the isolation design of irregular structures.
The dynamic behaviour of an irregular L-shaped high-rise base-isolation structure under different direction seismic waves has been analyzed.Then the most unfavorable displacement ratio variation between the non-isolation design and the isolation story design is studied with continuous optimizing eccentricity.The motion equation of a high-rise base-isolated structure is established and its eccentricity solving process is discussed,and based on the above theoretical calculations of the structural eccentricity and displacement ratio,5 examples are analyzed with ETABS.The results show that the effect of the eccentricity changes on the torsion of irregular L-shaped high-rise structure is similar with the general structure,they all have the simlar law.The isolation design can effectively improve the serious torsional problem in the irregular L-shaped structure.In the meantime,the structural displacement ratio decreases with the reduction of the spacing distamce between the stiffness centre of isotation layer and the mass centre of superstructure.So it's necessary to reduce the eccentricity under the condition of meeting isolation design requirements so as to make sure of damping effect and structural safety during the isolation design of irregular structures.
引文
[1]Tarics A G,Way D,Kelly J M.The implementation of isolation for the Foothill Communities Law and Justice Center[R].Report to the NationalScience Foundation,1986.
[2]Papageorgiou A S,Lin B C.Study of the earthquake response of the base-isolated Law and Justice Center in Rancho Cucamonga[J].EarthquakeEngineering and Structural Dynamics,1989,18(8):189-1200.
[3]Nagarajaiah S,Reinborn A M,Constantinou M C.Torsional-coupling in sliding base isolated structures[J].Journal of Structural Engineering,1993,119(1):130-149.
[4]李宏男,吴香香.偏心隔震结构扭转地震作用的简化计算公式[J].哈尔滨工业大学学报,2004,36(1):53-54.Li Hongnan,Wu Xiangxiang.Simplified formulae of torsional seismic actions for base-isolated eccentric structures[J].Journal of Harbin Institute ofTechnology,2004,36(1):53-54.
[5]日本建筑学会.隔震结构设计[M].北京:地震出版社,2006.Architectural Society of Japan.Recommendation for the Design of Base Isolated Buildings[M].Beijing:Seismic Publishing House,2006.
[6]王建强,姚谦峰.基础隔震单层偏心结构扭转地震反应分析[J].世界地震工程,2004,20(1):36-38.Wang Jianqiang,Yao Qianfeng.Analysis on torsional seismic response of one-story asymmetric structure with base isolation[J].World EarthquakeEngineering,2004,20(1):36-38.
[7]江宜城,唐家祥.单轴偏心的单层隔震框架结构地震扭转反应分析[J].世界地震工程,1999,15(4):58-61.Jiang Yicheng,Tang Jiaxiang.The torsional response analysis of the base-isolated building[J].World Earthquake Engineering,1999,15(4):58-61.
[8]袁兵,黄炎生,任立飞,等.框架-剪力墙基础隔震结构的地震扭转反应[J].华南理工大学学报(自然科学版),2006,34(7):95-97.Yuan Bing,Huang Yansheng,Ren Lifei,et al.Seismic torsional response of base-Isolated structure with frame-shear wall[J].Journal of South Chi-na University of Technology(Natural Science Edition),2006,34(7):95-97.
[2]Papageorgiou A S,Lin B C.Study of the earthquake response of the base-isolated Law and Justice Center in Rancho Cucamonga[J].EarthquakeEngineering and Structural Dynamics,1989,18(8):189-1200.
[3]Nagarajaiah S,Reinborn A M,Constantinou M C.Torsional-coupling in sliding base isolated structures[J].Journal of Structural Engineering,1993,119(1):130-149.
[4]李宏男,吴香香.偏心隔震结构扭转地震作用的简化计算公式[J].哈尔滨工业大学学报,2004,36(1):53-54.Li Hongnan,Wu Xiangxiang.Simplified formulae of torsional seismic actions for base-isolated eccentric structures[J].Journal of Harbin Institute ofTechnology,2004,36(1):53-54.
[5]日本建筑学会.隔震结构设计[M].北京:地震出版社,2006.Architectural Society of Japan.Recommendation for the Design of Base Isolated Buildings[M].Beijing:Seismic Publishing House,2006.
[6]王建强,姚谦峰.基础隔震单层偏心结构扭转地震反应分析[J].世界地震工程,2004,20(1):36-38.Wang Jianqiang,Yao Qianfeng.Analysis on torsional seismic response of one-story asymmetric structure with base isolation[J].World EarthquakeEngineering,2004,20(1):36-38.
[7]江宜城,唐家祥.单轴偏心的单层隔震框架结构地震扭转反应分析[J].世界地震工程,1999,15(4):58-61.Jiang Yicheng,Tang Jiaxiang.The torsional response analysis of the base-isolated building[J].World Earthquake Engineering,1999,15(4):58-61.
[8]袁兵,黄炎生,任立飞,等.框架-剪力墙基础隔震结构的地震扭转反应[J].华南理工大学学报(自然科学版),2006,34(7):95-97.Yuan Bing,Huang Yansheng,Ren Lifei,et al.Seismic torsional response of base-Isolated structure with frame-shear wall[J].Journal of South Chi-na University of Technology(Natural Science Edition),2006,34(7):95-97.
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