多层钢框架结构强度折减系数研究
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摘要
结构强度折减系数是基于强度抗震设计法中确定设计地震作用的关键。我国现行《建筑抗震设计规范》[1](GB 50011—2010,简称《规范》)对不同的结构体系采用单一的强度折减系数,不尽合理。在已有强度折减系数方法基础上,提出了以中震位移限值为极限位移的改进间接确定强度折减系数方法,将其应用于钢框架结构强度折减系数中,并与直接强度折减系数方法进行对比分析,验证了此方法的有效性和准确性,研究表明钢框架结构强度折减系数不受建筑层数的影响,其强度折减系数接近于4。
Structural strength reduction factor is the key to determine earthquake action in strength-based seismic design.The Code for Seismic Design of Buildings(GB 50011—2010)specifies a uniform strength reduction factor for various structure systems,and this may not be reasonable in many situations.This paper presents an improved strength reduction approach utilizing displacement as criteria in moderate earthquakes.The accuracy of the proposed approach is verified through comparing with results from the direct strength reduction approach.The design examples show that strength reduction factor of the steel frame is not related to the number of stories,and the strength reduction coefficient for multi-story steel frames is close to 4.
Structural strength reduction factor is the key to determine earthquake action in strength-based seismic design.The Code for Seismic Design of Buildings(GB 50011—2010)specifies a uniform strength reduction factor for various structure systems,and this may not be reasonable in many situations.This paper presents an improved strength reduction approach utilizing displacement as criteria in moderate earthquakes.The accuracy of the proposed approach is verified through comparing with results from the direct strength reduction approach.The design examples show that strength reduction factor of the steel frame is not related to the number of stories,and the strength reduction coefficient for multi-story steel frames is close to 4.
引文
[1]GB 50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010GB 50011—2010Code for Seismic Design of Building[S].Beijing:China Architecture&Building Press,2010(in Chinese)
[2]NEHRP Recommended provisions for seismic regulations for new buildings and other structures with accompanying commentary(FEMA 450)[R].Washington D C,2003
[3]周靖,赵卫峰.建筑抗震设计地震作用折减系数的取值方法[J].防震减灾工程学报,2007,27(4):465-469Zhou Jing,Zhao Weifeng.Method of determining earthquake force reduction factor for seismic design of building[J].Journal of Disaster Prevention and Mitigation Engineering,2007,27(4):465-469(in Chinese)
[4]Chia-Ming Uang.Establishing R(or Rw)and Cd factors for building seismic provisions[J].Journal of Structural Engineering,1991,117(1):19-28
[5]Kappos A J.Evaluation of behaviour factors on the basis of ductility and overstrength studies[J].Engineering Structures,1999,21(9):823-835
[6]Maheri M R,Akbari R.Seismic behaviour factor,R,for steel X-braced and knee-braced RC buildings[J].Engineering Structures,2003,25(12):1505-1513
[7]Jinkoo Kim,Hyunhoon Choi.Response modification factors of chevron-braced frames[J].Engineering Structures,2005,27(2):285-300
[8]Fathi M,Daneshjoo F,Melchers R E.A method for determining the behaviour factor of moment-resisting steel frames with semi-rigid connections[J].Engineering Structures,2006,28(4):514-531
[9]Mahmoudi M,Zaree M.Evaluating response modification factors of concentrically braced steel frames[J].Journal of Constructional Steel Research,2010,66(10):1196-1204
[10]卓卫东,范立础.结构抗震设计中的强度折减系数研究[J].地震工程与工程振动,2001,21(1):84-88Zhuo Weidong,Fan Lichu.On strength reduction factors used for seismic design of structures[J].Earthquake Engineering and Engineering Vibration,2001,21(1):84-88(in Chinese)
[11]翟长海,谢礼立.进场脉冲效应对强度折减系数的影响分析[J].土木工程学报,2006,39(7):15-18Zhai Changhai,Xie Lili.Adjacent-field velocity pulse effect on strength reduction factors[J].China Civil Engineering Journal,2006,39(7):15-18(in Chinese)
[12]翟长海,谢礼立.考虑设计地震分组的强度折减系数的研究[J].地震学报,2006,28(3):284-294Zhai Changhai,Xie Lili.Study on strength reduction factors considering the effect of classification of design earthquake effect[J].Acta Seismologica Sinica,2006,28(3):284-294(in Chinese)
[13]翟长海,谢礼立.多自由度体系效应对强度折减系数的影响[J].工程力学,2006,23(11):33-37,69Zhai Changhai,Xie Lili.Estimation of MDOF effects on strength reduction factors[J].Engineering Mechanics,2006,23(11):33-37,69(in Chinese)
[14]周靖,蔡健,方小丹.剪切型结构的抗震强度折减系数研究[J].地震工程与工程振动,2008,28(2):64-71Zhou Jing,Cai Jian,Fang Xiaodan.Analysis of seismic strength reduction factors for shear-type structures[J].Journal of Earthquake Engineering and Engineering Vibration,2008,28(2):64-71(in Chinese)
[15]赵永峰,童根树.修正Clough滞回模型下的地震力调整系数[J].土木工程学报,2006,39(10):34-41Zhao Yongfeng,Tong Genshu.Seismic force modification factors for structures with modified-Clough hysteretic model[J].China Civil Engineering Journal,2006,39(10):34-41(in Chinese)
[16]CECS 160:2004建筑工程抗震性态设计通则(试用)[S].北京:中国计划出版社,2004CECS 160:2004General Rule for Performance-Based Seismic Design of Buildings[S].Beijing:China Planning Press,2004(in Chinese)
[17](美)乔普拉.结构动力学:理论及其在地震工程中的应用[M].谢礼立,吕大刚,译.2版.北京:高等教育出版社,2007Chopra A K.Dynamics of strutures:theory and applications earthguake enginering[M].Translated by Xie Lili,Lv Dagang.2nd ed.Beijing:Higher Education Press,2007(in Chinese)
[18]李成,徐柏荣,顾强.抗弯钢框架结构影响系数研究[J].建筑结构,2007,37(10):43-45Li Cheng,Xu Bairong,Gu Qiang.Research on structural influencing coefficient of moment-resisting steel frames[J].Building Structure,2007,37(10):43-45(in Chinese)
[19]Bertero V V.Strength and deformation capacities of buildings under extreme environments[M]//Structural Engineering and Structural Mechanics.Pister K(ed.).Englewood:PrenticeHall Inc,1977:211-215
[20]徐春兰,顾强.多层抗弯钢框架的结构影响系数[J].苏州科技学院学报:工程技术版,2007,20(1):10-14Xu Chunlan,Gu Qiang.Structural influencing coefficient in multi-story moment resisting steel frames[J].Journal of University of Science and Technology of Suzhou:Engineering and Technology,2007,20(1):10-14(in Chinese)
[21]杨俊芬,张凡,顾强.人字形中心支撑钢框架的结构影响系数研究[J].建筑结构,2007,37(10):46-49Yang Junfen,Zhang Fan,Gu Qiang.Study on response modification factors of inverted-V CBSF[J].Building Structure,2007,37(10):46-49(in Chinese)
[22]庄为华,朱建华.人字形偏心支撑钢框架的结构影响系数[J].山西建筑,2009,35(32):57-58Zhuang Weihua,Zhu Jianhua.Structure influencing coefficient of the herringbone eccentricity supporting rigid frame[J].Shanxi Architecture,2009,35(32):57-58(in Chinese)
[23]任云峰,顾强.K形偏心支撑钢框架结构影响系数[J].苏州科技学院学报:工程技术版,2008,21(2):1-5 Ren Yunfeng,Gu Qiang.Structural influencing coefficient of K-eccentrically braced steel frames[J].Journal of University of Science and Technology of Suzhou:Engineering and Technology,2008,21(2):1-5(in Chinese)
[24]徐绩青.延性系数确定方法的探讨[J].水运工程,2004(9):14-17Xu Jiqing.Method of determining ductile coefficient[J].Port&Waterway Engineering,2004(9):14-17(in Chinese)
[25]张金海.钢结构地震作用取值的建议与分析[D].哈尔滨:哈尔滨工业大学,2005
[2]NEHRP Recommended provisions for seismic regulations for new buildings and other structures with accompanying commentary(FEMA 450)[R].Washington D C,2003
[3]周靖,赵卫峰.建筑抗震设计地震作用折减系数的取值方法[J].防震减灾工程学报,2007,27(4):465-469Zhou Jing,Zhao Weifeng.Method of determining earthquake force reduction factor for seismic design of building[J].Journal of Disaster Prevention and Mitigation Engineering,2007,27(4):465-469(in Chinese)
[4]Chia-Ming Uang.Establishing R(or Rw)and Cd factors for building seismic provisions[J].Journal of Structural Engineering,1991,117(1):19-28
[5]Kappos A J.Evaluation of behaviour factors on the basis of ductility and overstrength studies[J].Engineering Structures,1999,21(9):823-835
[6]Maheri M R,Akbari R.Seismic behaviour factor,R,for steel X-braced and knee-braced RC buildings[J].Engineering Structures,2003,25(12):1505-1513
[7]Jinkoo Kim,Hyunhoon Choi.Response modification factors of chevron-braced frames[J].Engineering Structures,2005,27(2):285-300
[8]Fathi M,Daneshjoo F,Melchers R E.A method for determining the behaviour factor of moment-resisting steel frames with semi-rigid connections[J].Engineering Structures,2006,28(4):514-531
[9]Mahmoudi M,Zaree M.Evaluating response modification factors of concentrically braced steel frames[J].Journal of Constructional Steel Research,2010,66(10):1196-1204
[10]卓卫东,范立础.结构抗震设计中的强度折减系数研究[J].地震工程与工程振动,2001,21(1):84-88Zhuo Weidong,Fan Lichu.On strength reduction factors used for seismic design of structures[J].Earthquake Engineering and Engineering Vibration,2001,21(1):84-88(in Chinese)
[11]翟长海,谢礼立.进场脉冲效应对强度折减系数的影响分析[J].土木工程学报,2006,39(7):15-18Zhai Changhai,Xie Lili.Adjacent-field velocity pulse effect on strength reduction factors[J].China Civil Engineering Journal,2006,39(7):15-18(in Chinese)
[12]翟长海,谢礼立.考虑设计地震分组的强度折减系数的研究[J].地震学报,2006,28(3):284-294Zhai Changhai,Xie Lili.Study on strength reduction factors considering the effect of classification of design earthquake effect[J].Acta Seismologica Sinica,2006,28(3):284-294(in Chinese)
[13]翟长海,谢礼立.多自由度体系效应对强度折减系数的影响[J].工程力学,2006,23(11):33-37,69Zhai Changhai,Xie Lili.Estimation of MDOF effects on strength reduction factors[J].Engineering Mechanics,2006,23(11):33-37,69(in Chinese)
[14]周靖,蔡健,方小丹.剪切型结构的抗震强度折减系数研究[J].地震工程与工程振动,2008,28(2):64-71Zhou Jing,Cai Jian,Fang Xiaodan.Analysis of seismic strength reduction factors for shear-type structures[J].Journal of Earthquake Engineering and Engineering Vibration,2008,28(2):64-71(in Chinese)
[15]赵永峰,童根树.修正Clough滞回模型下的地震力调整系数[J].土木工程学报,2006,39(10):34-41Zhao Yongfeng,Tong Genshu.Seismic force modification factors for structures with modified-Clough hysteretic model[J].China Civil Engineering Journal,2006,39(10):34-41(in Chinese)
[16]CECS 160:2004建筑工程抗震性态设计通则(试用)[S].北京:中国计划出版社,2004CECS 160:2004General Rule for Performance-Based Seismic Design of Buildings[S].Beijing:China Planning Press,2004(in Chinese)
[17](美)乔普拉.结构动力学:理论及其在地震工程中的应用[M].谢礼立,吕大刚,译.2版.北京:高等教育出版社,2007Chopra A K.Dynamics of strutures:theory and applications earthguake enginering[M].Translated by Xie Lili,Lv Dagang.2nd ed.Beijing:Higher Education Press,2007(in Chinese)
[18]李成,徐柏荣,顾强.抗弯钢框架结构影响系数研究[J].建筑结构,2007,37(10):43-45Li Cheng,Xu Bairong,Gu Qiang.Research on structural influencing coefficient of moment-resisting steel frames[J].Building Structure,2007,37(10):43-45(in Chinese)
[19]Bertero V V.Strength and deformation capacities of buildings under extreme environments[M]//Structural Engineering and Structural Mechanics.Pister K(ed.).Englewood:PrenticeHall Inc,1977:211-215
[20]徐春兰,顾强.多层抗弯钢框架的结构影响系数[J].苏州科技学院学报:工程技术版,2007,20(1):10-14Xu Chunlan,Gu Qiang.Structural influencing coefficient in multi-story moment resisting steel frames[J].Journal of University of Science and Technology of Suzhou:Engineering and Technology,2007,20(1):10-14(in Chinese)
[21]杨俊芬,张凡,顾强.人字形中心支撑钢框架的结构影响系数研究[J].建筑结构,2007,37(10):46-49Yang Junfen,Zhang Fan,Gu Qiang.Study on response modification factors of inverted-V CBSF[J].Building Structure,2007,37(10):46-49(in Chinese)
[22]庄为华,朱建华.人字形偏心支撑钢框架的结构影响系数[J].山西建筑,2009,35(32):57-58Zhuang Weihua,Zhu Jianhua.Structure influencing coefficient of the herringbone eccentricity supporting rigid frame[J].Shanxi Architecture,2009,35(32):57-58(in Chinese)
[23]任云峰,顾强.K形偏心支撑钢框架结构影响系数[J].苏州科技学院学报:工程技术版,2008,21(2):1-5 Ren Yunfeng,Gu Qiang.Structural influencing coefficient of K-eccentrically braced steel frames[J].Journal of University of Science and Technology of Suzhou:Engineering and Technology,2008,21(2):1-5(in Chinese)
[24]徐绩青.延性系数确定方法的探讨[J].水运工程,2004(9):14-17Xu Jiqing.Method of determining ductile coefficient[J].Port&Waterway Engineering,2004(9):14-17(in Chinese)
[25]张金海.钢结构地震作用取值的建议与分析[D].哈尔滨:哈尔滨工业大学,2005
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