基于IDA的RC框架延性分析
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摘要
文章提出了一种基于增量动力分析(IDA)定量评定结构延性的方法,通过6层3跨钢筋混凝土(RC)框架算例表明:采用四次多项式函数拟合IDA各时程分析点的最大基底剪力-最大变形系列点,并以IDA倒塌点近似作为延性极限点,能够较好地获取结构动力延性;动力延性同时取决于结构自身特性与荷载过程;结构在20条波下的平均动力延性系数小于静力延性系数。该方法对评定结构的地震延性具有参考价值。
In order to quantitatively evaluate structure's dynamic ductility,the incremental dynamic analysis(IDA)method was used to obtain smooth capability curve of structure in which the discrete response force-deformation points were matched with quartic polynomial,and the IDA collapse point was approximately regarded as ultimate point of ductility definition.Taking a 6-story RC frame as an example,the results were as follows:the dynamic ductility was determined by both structural characteristics and load time history;the average dynamic ductility factor of 20 ground motions was less than the static ductility factor in the given example.This study may have reference value for evaluating seismic ductility of structures.
In order to quantitatively evaluate structure's dynamic ductility,the incremental dynamic analysis(IDA)method was used to obtain smooth capability curve of structure in which the discrete response force-deformation points were matched with quartic polynomial,and the IDA collapse point was approximately regarded as ultimate point of ductility definition.Taking a 6-story RC frame as an example,the results were as follows:the dynamic ductility was determined by both structural characteristics and load time history;the average dynamic ductility factor of 20 ground motions was less than the static ductility factor in the given example.This study may have reference value for evaluating seismic ductility of structures.
引文
[1]徐云扉,胡庆昌,陈玉峰,等.低周反复荷载下两跨三层钢筋混凝土框架受力性能的试验研究[J].建筑结构学报,1986,7(2):1-15.
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[5]汪金祥,肖亚明,刘顺,等.基于Pushover原理的钢框架静力弹塑性分析[J].合肥工业大学学报:自然科学版,2014,37(10):1249-1253.
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[7]Vamvatsikos D,Cornell C A.Incremental dynamic analysis[J].Earthquake Engineering and Structural Dynamics,2002,31(3):491-514.
[8]Park R.Ductility evaluation from laboratory and analytical testing[C]//Proceedings of 9th World Conference on Earthquake Engineering,Tokyo-Kyoto,1988:605-616.
[9]黄嘉.基于非线性动力反应分析的钢筋混凝土乙类建筑抗震设计思路的初步探讨[D].重庆:重庆大学,2003.
[10]G B50011-2010,建筑抗震设计规范[S].
[11]GB 50010-2010,混凝土结构设计规范[S].
[12]McKenna F,Fenves G L,Scott M H.Open system for earthquake engineering simulation[R].University of California at Berkeley,Pacific Earthquake Engineering Research Center,2008.
[13]中国建筑学会建筑结构防倒塌专业委员会.钢筋混凝土框架结构拟静力倒塌试验研究及数值模拟竞赛Ⅲ:模拟结果分析[J].建筑结构,2012,42(11):27-30.
[2]唐兴荣,周振轶,刘利花,等.多层砌体填充墙框架结构抗震性能试验研究[J].建筑结构学报,2012,33(11):72-81.
[3]余志武,周凌宇,刘小洁,等.砼及预应力砼框架结构的延性分析[J].建筑结构,1997,15(2):41-45.
[4]蔡健,周靖,方小丹.钢筋混凝土框架抗震位移延性系数研究[J].工程抗震与加固改造,2005,27(3):2-6.
[5]汪金祥,肖亚明,刘顺,等.基于Pushover原理的钢框架静力弹塑性分析[J].合肥工业大学学报:自然科学版,2014,37(10):1249-1253.
[6]吕大刚,于晓辉,陈志恒.钢筋混凝土框架结构侧向倒塌地震易损性分析[J].哈尔滨工业大学学报,2011,43(6):1-5.
[7]Vamvatsikos D,Cornell C A.Incremental dynamic analysis[J].Earthquake Engineering and Structural Dynamics,2002,31(3):491-514.
[8]Park R.Ductility evaluation from laboratory and analytical testing[C]//Proceedings of 9th World Conference on Earthquake Engineering,Tokyo-Kyoto,1988:605-616.
[9]黄嘉.基于非线性动力反应分析的钢筋混凝土乙类建筑抗震设计思路的初步探讨[D].重庆:重庆大学,2003.
[10]G B50011-2010,建筑抗震设计规范[S].
[11]GB 50010-2010,混凝土结构设计规范[S].
[12]McKenna F,Fenves G L,Scott M H.Open system for earthquake engineering simulation[R].University of California at Berkeley,Pacific Earthquake Engineering Research Center,2008.
[13]中国建筑学会建筑结构防倒塌专业委员会.钢筋混凝土框架结构拟静力倒塌试验研究及数值模拟竞赛Ⅲ:模拟结果分析[J].建筑结构,2012,42(11):27-30.
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