抗震结构扭转控制及设计方法的国内外规范对比分析
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摘要
对国内外规范中有关结构扭转控制及设计的条文规定进行了深入对比,较为全面地分析了各国规范关于结构扭转设计的现状,得到一些有益的启示;对我国现行规范的相关规定进行了讨论,提出了一些建议,可为我国规范的进一步修订提供参考.主要结论有:我国规范的扭转位移比限值可以突破1.4(或1.5),但其量值还有待进一步研究;《高规》中的平扭周期比限值是否必要或可否在位移比较小时放松要求值得研究;计算结构扭转效应时无论单、双向地震输入时都需考虑偶然偏心;构件的扭矩计算应加以考虑,对边缘竖向构件的箍筋可予以加强.
A comparison of terms on tortional control and design for seismic structures is conducted between different codes at home and abroad in this paper.Thereby,a general idea about the current state of torsional design for structures from worldwide codes is gained,finding some useful illuminations.Meanwhile,based on a deep analysis over relevant specifications of current China Design Code,some suggestions are put forward for further revisions in China code.And conclusions are drawn as follows:The torsional displacement ratio in our code can be over 1.4 or 1.5,while its magnitude needs further exploration.Whether the torsion-translation period ratio in "Technical specification for concrete structures of tall buildings" is necessary also needs to be studied,and when the storey translational displacement is small,the demand for the period ratio can be adequately reduced.When calculating the structural torsion effect,the accidental eccentricity needs taking into account in terms of one-way and two-way earthquake inputs.The torque calculation of virtical components should be considered and the stirrup for edge vertical components should be reinforced.
A comparison of terms on tortional control and design for seismic structures is conducted between different codes at home and abroad in this paper.Thereby,a general idea about the current state of torsional design for structures from worldwide codes is gained,finding some useful illuminations.Meanwhile,based on a deep analysis over relevant specifications of current China Design Code,some suggestions are put forward for further revisions in China code.And conclusions are drawn as follows:The torsional displacement ratio in our code can be over 1.4 or 1.5,while its magnitude needs further exploration.Whether the torsion-translation period ratio in "Technical specification for concrete structures of tall buildings" is necessary also needs to be studied,and when the storey translational displacement is small,the demand for the period ratio can be adequately reduced.When calculating the structural torsion effect,the accidental eccentricity needs taking into account in terms of one-way and two-way earthquake inputs.The torque calculation of virtical components should be considered and the stirrup for edge vertical components should be reinforced.
引文
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[18]徐培福,黄吉锋,韦承基.高层建筑结构在地震作用下的扭转震动效应[J].土木工程学报,2000,16(1):1-6.XU Pei-fu,HUANGJi-feng,WEI Cheng-ji.Response of torsional vibration of tall building structures induced by seismic action[J].China civil engineering journal,2000,16(1):1-6.
[19]徐培福,黄吉锋,韦承基.高层建筑结构的扭转反应控制[J].土木工程学报,2006,39(7):1-8.XU Pei-fu,HUANGJi-feng,WEI Cheng-ji.Control of torsional response of tall building structures[J].China civil engineering journal,2006,39(7):1-8.
[20]Dempsey K M,Tso W K.Seismic torsional provisions for dynamic eccentricity[J].Earthquake Engineering and Structural Dynamics,1980,8(2):275-289.
[2]张俊发,杨迪雄.空间非对称框架结构偏心扭转地震反应的控制[J].西安建筑科技大学学报:自然科学版,2002,34(4):349-353.ZHANGJun-fa,YANG Di-xiong.The study on controlling eccentric torsional seismic response of the3Dasymmet-ric frame structure[J].J.Xi an Univ.of Arch.&Tech.(Natural Science Edition),2002,34(4):349-353.
[3]魏琏,王森,韦承基.水平地震作用下不对称不规则结构的抗扭设计方法研究[J].建筑结构,2005,35(8):12-17.WEI Lian,WANG Sen,WEI Cheng-ji.Torsional design method of asymmetric and irregular building under hori-zontal earthquake action[J].Building Structure,2005,35(8):12-17.
[4]Uniform Building code(UBC).Structural Design Provisions,International Conference of Building officials(ICBD)[S].1997.
[5]FEMA.NEHRP Recommended Provisions for Seismic Regulations for new Buildings and other Structures[Z].Building Seismic Safety Council(BSSC).2003:FEMA450.2003.
[6]International Building Code2003,International Code Council[S].2003.
[7]程绍革.Structural Euro codes(EC8)[R].北京:中国建筑科学研究院工程抗震研究所,1997.CHEN Shao-ge.Structural Euro codes(EC8)[R].Beijing:China Academy of Building Research,1997.
[8]New Zealand Standard NZS4203:1992.Code of practice for general structural design and designloadings for build-ings[S].Standards Association of New Zealand,Wellington,New Zealand,1992.
[9]GB50011-2001,建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.GB50011-2001,Code for seismic design of buildings[S].Beijing:China Building Industry Press,2001.
[10]JGJ3-2002,高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社,2001.JGJ3-2002,Technical specification for concrete structures of tall building[S].Beijing:China Building Industry Press,2001.
[11]Architectural Institute of Japan.An Standard for structural calculation of reinforced concrete structures[S].1983.
[12]石诚.考虑双向水平地震作用的结构抗震分析与设计若干问题研究[D].重庆:重庆大学,2003.SHI Cheng.Study on Several Problems of Structural Seismic Analysis and Design Considering Earthquake Actions in Two Directions Simultaneously[D].Chongqing:Chongqing University,2003.
[13]北京市建筑标准化办公室.北京市建筑设计技术细则—结构专业[Z].2004.Beijing building standardization office.Beijing building design technical manual(structure speciality)[Z].2004.
[14]JGJ3-2002,广东省实施《高层建筑混凝土结构技术规程》补充规定[S].北京:中国建筑工业出版社,2005.JGJ3-2002,The complementary provision of“Technical specification for concrete structures of tall building(JGJ3-2002)”for Guangdong[S].Beijing:China Building Industry Press,2005.
[15]建设部.超限高层建筑工程抗震设防专项审查技术要点[Z].2003.Ministry of Construction of the P.R.China.The technical points for reviewof seismic fortification of tall buildings with design beyond the code limits[Z].2003.
[16]方鄂华,程懋堃.关于规程中对扭转不规则控制方法的探讨[J].建筑结构,2005,36(11):12-15.FANG E-hua,CHEN Mao-kun.Discussion of torsion resistance control method for structures in current design code[J].Building Structure,2005,36(11):12-15.
[17]徐培福,王亚勇.关于超限高层建筑抗震设防审查的若干讨论[J].土木工程学报,2004,37(1):1-12.XU Pei-fu,WANG Ya-yong.Discussion on reviewof seismic fortification of tall buildings with design beyond the code limits[J].China civil engineering journal,2004,37(1):1-12.
[18]徐培福,黄吉锋,韦承基.高层建筑结构在地震作用下的扭转震动效应[J].土木工程学报,2000,16(1):1-6.XU Pei-fu,HUANGJi-feng,WEI Cheng-ji.Response of torsional vibration of tall building structures induced by seismic action[J].China civil engineering journal,2000,16(1):1-6.
[19]徐培福,黄吉锋,韦承基.高层建筑结构的扭转反应控制[J].土木工程学报,2006,39(7):1-8.XU Pei-fu,HUANGJi-feng,WEI Cheng-ji.Control of torsional response of tall building structures[J].China civil engineering journal,2006,39(7):1-8.
[20]Dempsey K M,Tso W K.Seismic torsional provisions for dynamic eccentricity[J].Earthquake Engineering and Structural Dynamics,1980,8(2):275-289.
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