双向地震激励下隔震结构抗倾覆特性的数值分析
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摘要
为研究叠层橡胶支座隔震建筑的抗倾覆性能,建立隔震结构在双向地震激励下倾覆力矩时域响应动力分析模型.在对该模型进行简化的基础上,利用结构设计反应谱探讨结构高宽比和结构基本周期等因素对隔震结构抗倾覆力矩与倾覆力矩比值的影响.给出多层和小高层隔震结构在双向地震作用下的抗倾覆安全因数随地震烈度、场地土类别的变化规律.利用本课题组承担设计的实际隔震工程,对"5.12"汶川地震陇南地震波的倾覆力矩响应进行数值分析.结果表明结构高宽比对隔震结构的抗倾覆性能的影响比结构基本周期更大,竖向振动产生的附加应力对隔震建筑抗倾覆性能总是不利的,并且设置隔震结构高宽比限值时应考虑工程所在地的设防烈度和场地土类别.
To study the overturning resistant property of seismic isolated building with laminated rubber bearing,the dynamic analysis model for time domain response of overturning moment is established which is subjected to bi-directional earthquake excitation.Based on a simplified model,the effect of the factors including height-to-width ratio and the fundamental period of isolated building on the ratio of anti-overturning moment to overturning moment is analyzed by using structure design response spectrum.The effect of seismic intensity and site soil type on anti-overturning safety factor of seismic isolated multi-story buildings and small high-rise buildings is analyzed under bi-directional earthquake excitation.Taken the seismic wave of Longnan from"5.12"Wenchuan earthquake as input signal,the overturning moment responses of several real isolated buildings are analyzed.The numerical analysis result indicates that height-to-width ratio has stronger effect on the anti-overturning property than the fundamental period,andvertical earthquake excitation always has negative effect on the anti-overturning property of isolated structures.The seismic fortification intensity and the site soil type should be considered to determine the limit value of height-to-width ratio.
To study the overturning resistant property of seismic isolated building with laminated rubber bearing,the dynamic analysis model for time domain response of overturning moment is established which is subjected to bi-directional earthquake excitation.Based on a simplified model,the effect of the factors including height-to-width ratio and the fundamental period of isolated building on the ratio of anti-overturning moment to overturning moment is analyzed by using structure design response spectrum.The effect of seismic intensity and site soil type on anti-overturning safety factor of seismic isolated multi-story buildings and small high-rise buildings is analyzed under bi-directional earthquake excitation.Taken the seismic wave of Longnan from"5.12"Wenchuan earthquake as input signal,the overturning moment responses of several real isolated buildings are analyzed.The numerical analysis result indicates that height-to-width ratio has stronger effect on the anti-overturning property than the fundamental period,andvertical earthquake excitation always has negative effect on the anti-overturning property of isolated structures.The seismic fortification intensity and the site soil type should be considered to determine the limit value of height-to-width ratio.
引文
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[9]杜永峰,李慧.近断层地震作用下隔震结构的响应分析[C]//地震工程与减轻地震灾害研讨会暨纪念汶川地震一周年会议论文集,北京:地震出版社,2008:270-275.
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[11]STAO Daiki,OOKI Yoji,MORIKAWA Hitoshi,et al.Evaluation of seismically isolated tall building based on long-term monitoring[C]//14thWorld Conf Earthquake Eng,Beijing,2008.
[2]刘文光,杨巧荣,周福霖.大高宽比隔震结构地震反应预测理论[J].广州大学学报:自然科学版,2004,3(4):346-350.LIU Wenguang,YANG Qiaorong,ZHOU Fulin.Earthquake response analysis theory for isolated structure with large aspect ratio[J].J Guangzhou Univ:Nat Sci,2004,3(4):346-350.
[3]祁皑,范宏伟.基础隔震结构高宽比限值研究[J].建筑结构学报,2004,25(6):52-58.QI Ai,FAN Hongwei.Research on the height-width ratio of base isolated structure[J].J Building Structures,2004,25(6):52-58.
[4]李宏男,吴香香.橡胶垫隔震支座结构高宽比限值研究[J].建筑结构学报,2003,24(2):14-19.LI Hongnan,WU Xiangxiang.Study on limit of height to width ratio for base-isolated buildings with rubber bearings under earthquake[J].J Building Structures,2003,24(2):14-19.
[5]党育,杜永峰,李慧.基础隔震结构设计及施工指南[M].北京:中国水利水电出版社,2007:105-107.
[6]杜永峰,李慧,金德保,等.大震下被动与智能隔震结构动力可靠度的对比[J].地震工程与工程振动,2006,26(4):212-217.DU Yongfeng,LI Hui,JIN Debao,et al.Comparison of seismic reliability of passive and smart isolated structures under major earthquakes[J].Earthquake Eng&Eng Vibration,2006,26(4):212-217.
[7]吴香香,李宏男.竖向地震动对基础隔震结构高宽比限值的影响[J].同济大学学报:自然科学版,2004,32(1):10-14.WU Xiangxiang,LI Hongnan.Effect of vertical motion on limit ratio of height to width for isolated structure[J].J Tongji Univ:Sci Nat,2004,32(1):10-14.
[8]杜永峰,李慧.关于“5.12”汶川地震时甘肃省陇南市武都区隔震建筑宏观性能的调研报告[R].兰州:兰州理工大学,2008.
[9]杜永峰,李慧.近断层地震作用下隔震结构的响应分析[C]//地震工程与减轻地震灾害研讨会暨纪念汶川地震一周年会议论文集,北京:地震出版社,2008:270-275.
[10]谷伟,刘斌.橡胶垫基础隔震结构考虑竖向地震作用高宽比限制研究[J].工业建筑,2004,34(10):17-20.GU Wei,LIU Bin.Research on the limit ratio of height to width for base-isolated structure with the rubber bearings considering the verticalearthquake action[J].Ind Construction,2004,34(10):17-20.
[11]STAO Daiki,OOKI Yoji,MORIKAWA Hitoshi,et al.Evaluation of seismically isolated tall building based on long-term monitoring[C]//14thWorld Conf Earthquake Eng,Beijing,2008.
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