隔震结构弹塑性反应谱分析研究
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摘要
根据弹塑性反应谱理论,按照非线性恢复力模型的等效阻尼比和位移延性的关系,以单质点弹塑性反应分析结果为依据,建立基于等效阻尼比的隔震结构弹塑性反应谱。进一步比较弹塑性反应谱和我国规范得到的反应谱,结果显示规范的加速度反应谱在长周期段谱值过大,阻尼衰减系数也较大。基于单质点弹塑性地震分析的结果,在我国规范反应谱公式的基础上提出的隔震结构弹塑性反应谱公式。最后通过对5层钢框架隔震结构模型进行振动台试验、数值时程分析、规范反应谱计算、以及用弹塑性反应谱进行计算。结果表明,时程分析法的分析结果和振动台试验的结果比较接近,而按照规范反应谱的等效线形化方法计算出的结果与振动台试验的结果有一些偏差,弹塑性反应谱的地震反应更加接近试验实测的结果,表明了新提出的弹塑性反应谱进行隔震结构的地震反应分析时具有良好的计算精度。
Based on the theory of elastic-plastic response spectrum and the relationship between displacement ductility and equivalent damping ratio of a non-linear restoring force model,according to the results of a single-mass elastoplastic response analysis,the elasto-plastic response spectrum of an isolated structure was established.Further,compared with the standard response spectrum of our country,the results showed that the values of the elasto-plastic acceleration response spectra in the long period cycles are overhigh,damping attenuation coefficients are also larger.Based on the results of a single-mass elasto-plastic seismic analysis,the elasto-plastic response spectrum formula of isolated structures was established. At last,shaking table tests of a 5-story steel isolated structure,the earthquake responses of the isolated structure using the new suggested acceleration response equation and the time history analysis method were compared,and the results obtained by using the modified long period response spectrum were consist with those from time history analyses and tests;the results by using the proposed equation of response spectrum had a higher precesion for isolated structures.
Based on the theory of elastic-plastic response spectrum and the relationship between displacement ductility and equivalent damping ratio of a non-linear restoring force model,according to the results of a single-mass elastoplastic response analysis,the elasto-plastic response spectrum of an isolated structure was established.Further,compared with the standard response spectrum of our country,the results showed that the values of the elasto-plastic acceleration response spectra in the long period cycles are overhigh,damping attenuation coefficients are also larger.Based on the results of a single-mass elasto-plastic seismic analysis,the elasto-plastic response spectrum formula of isolated structures was established. At last,shaking table tests of a 5-story steel isolated structure,the earthquake responses of the isolated structure using the new suggested acceleration response equation and the time history analysis method were compared,and the results obtained by using the modified long period response spectrum were consist with those from time history analyses and tests;the results by using the proposed equation of response spectrum had a higher precesion for isolated structures.
引文
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[9]日本建筑学会著,刘文光译,冯德民校.隔震结构设计[M].北京:地震出版社,2006.
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[2]Lin Y Y.Statistical study on damping modification factors adopted in Taiwan' s seismic isolation design code by using the 21 September 1999 Chi-Chi earthquake,Taiwan.Engineering Structures,2007(29):682 - 693.
[3]郭明珠,陈厚群.场地类别划分与抗震设计反应谱的讨论[J].世界地震工程,2003,6:108-111.
[4]赵斌,王亚勇.关于《建筑抗震设计规范》GB50011-2001中设计反应谱的几点讨论[J].工程抗震,2003, 1:13-14.
[5]周雍年,周正华,于海英.设计反应谱长周期段的研究[J].地震工程与工程振动,2004,2:15-18.
[6]梁小华,蒋溥.桃夭门大桥基岩长周期设计反应谱[J].地震地质,2004,12:772-783.
[7]何文福,霍达,刘文光.长周期隔震结构的地震反应分析[J].北京工业大学学报,2007,12:30-34.
[8]王东升,李宏男,王国新.弹塑性地震反应谱的长周期特性研究[J].地震工程与工程振动,2006,16(2):49-55.
[9]日本建筑学会著,刘文光译,冯德民校.隔震结构设计[M].北京:地震出版社,2006.
[10]易伟建,张海燕.结构随机延性需求谱的理论研究[J].工程力学,2006,23(5):14-19.
[11]中华人民共和国标准,建筑抗震设计规范(GB50011- 2001)[S].北京:中国建筑工业出版社,2001.
[12]张海燕.基于位移的概率地震需求分析与结构抗震设计研究[D].湖南大学,2005.
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