基于ETM的钢筋混凝土框架结构抗震分析
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摘要
ETM是通过对结构输入一条随着时间增加,地震动强度不断增大的地震动加速度时程曲线,进而分析结构从弹性响应到倒塌状态的整个过程。本文基于ETM合成了三条符合我国抗震规范反应谱的耐震时程加速度曲线,并对其反应谱进行了误差分析。使用SAP2000建立一个六层钢筋混凝土框架结构弹塑性模型,并对模型塑性铰设置的可靠性进行验证,最后对结构进行耐震时程分析和增量动力分析,对比分析两种方法得到的最大顶点位移、最大层间位移角、最大基底剪力等结构响应结果。结果表明,合成的耐震时程加速度曲线合理可靠,模型符合分析要求,耐震时程法能较好的预测结构的地震响应,其分析结果与增量动力分析基本吻合,且计算效率高。
The endurance time method( ETM) is introduced. By inputting a time-history curve of acceleration of ground motion with time increasing,the intensity of ground motion increases gradually.The whole process of the structure from elastic response to collapse state can be calculated. Three endurance time accelerograms( ETA) are generated based on the national seismic design spectra,and the error analysis of the reaction spectrum is also carried out. An elastoplastic model of a six-story reinforced concrete frame structure is established by using SAP2000,and the reliability of the plastic hinge setting of the model is verified. Finally,incremental dynamic analysis of structures and endurance time analysis of structures are carried out. The comparisons of the maximum roof displacement,the maximum interstory drift ratio and the maximum base shear are performed. The results show that the endurance time accelerograms curve is reasonable and reliable,the model meets the requirement of analysis,and ETM can predict the seismic response of structures better. The analysis results are basically consistent with the incremental dynamic analysis,and the calculation efficiency is high.
The endurance time method( ETM) is introduced. By inputting a time-history curve of acceleration of ground motion with time increasing,the intensity of ground motion increases gradually.The whole process of the structure from elastic response to collapse state can be calculated. Three endurance time accelerograms( ETA) are generated based on the national seismic design spectra,and the error analysis of the reaction spectrum is also carried out. An elastoplastic model of a six-story reinforced concrete frame structure is established by using SAP2000,and the reliability of the plastic hinge setting of the model is verified. Finally,incremental dynamic analysis of structures and endurance time analysis of structures are carried out. The comparisons of the maximum roof displacement,the maximum interstory drift ratio and the maximum base shear are performed. The results show that the endurance time accelerograms curve is reasonable and reliable,the model meets the requirement of analysis,and ETM can predict the seismic response of structures better. The analysis results are basically consistent with the incremental dynamic analysis,and the calculation efficiency is high.
引文
[1]白久林,欧进萍.基于IDA方法的钢筋混凝土结构失效模式优化[J].工程力学,2011,28(s2):198-203.
[2]缪志伟,马千里,叶列平,等. Pushover方法的准确性和适用性研究[J].工程抗震与加固改造,2008,(1):55-59.
[3] Estekanchi H E,Riahi H T,Vafai A. Application of endurance time method in seismic assessment of steel frames[J]. Engineering Structures,2011,33(9):2535-2546.
[4] Estekanchi H E,Vafai A,Sadeghazar M. Endurance time method for seismic analysis and design of structures[J]. Scientia Iranica,2004,11(4):361-370.
[5] Estekanchi H E,Valamanesh V,Vafai A. Application of endurance time method in linear seismic analysis[J]. Engineering Stuctures,2007,29:2551-2562.
[6] Riahi H T,Estekanchi H E. Seismic assessment of steel frames with the endurancetime method[J]. Journal of Constructional Steel Research,2010,66(6):780-792.
[7]白久林,杨乐,欧进萍.结构抗震分析的耐震时程方法[J].地震工程与工程振动,2014,34(1):8-18.
[8]白久林,欧进萍.基于耐震时程法的钢筋混凝土框架结构抗震性能评估[J].工程力学,2016,(10):86-96.
[9] Riahi H T,Estekanchi H E,Seyedainboroujeni S.Application of endurance time method in nonlinear seismic analysis of steel frames[J]. Procedia Engineering,2011,14:3237-3244.
[10]北京金土木软件技术有限公司,中国建筑标准设计研究院. SAP2000中文版使用指南[M].北京:人民交通出版社,2006.
[2]缪志伟,马千里,叶列平,等. Pushover方法的准确性和适用性研究[J].工程抗震与加固改造,2008,(1):55-59.
[3] Estekanchi H E,Riahi H T,Vafai A. Application of endurance time method in seismic assessment of steel frames[J]. Engineering Structures,2011,33(9):2535-2546.
[4] Estekanchi H E,Vafai A,Sadeghazar M. Endurance time method for seismic analysis and design of structures[J]. Scientia Iranica,2004,11(4):361-370.
[5] Estekanchi H E,Valamanesh V,Vafai A. Application of endurance time method in linear seismic analysis[J]. Engineering Stuctures,2007,29:2551-2562.
[6] Riahi H T,Estekanchi H E. Seismic assessment of steel frames with the endurancetime method[J]. Journal of Constructional Steel Research,2010,66(6):780-792.
[7]白久林,杨乐,欧进萍.结构抗震分析的耐震时程方法[J].地震工程与工程振动,2014,34(1):8-18.
[8]白久林,欧进萍.基于耐震时程法的钢筋混凝土框架结构抗震性能评估[J].工程力学,2016,(10):86-96.
[9] Riahi H T,Estekanchi H E,Seyedainboroujeni S.Application of endurance time method in nonlinear seismic analysis of steel frames[J]. Procedia Engineering,2011,14:3237-3244.
[10]北京金土木软件技术有限公司,中国建筑标准设计研究院. SAP2000中文版使用指南[M].北京:人民交通出版社,2006.