考虑偶然偏心的动力近似抗震分析研究
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摘要
针对高层建筑计算单向水平地震响应时的偶然偏心,该文讨论了振型分解反应谱法与等效扭矩近似法两种动力计算方案;通过二组算例,给出了偏心后两种方案的计算结果随侧扭周期比的变化曲线。研究表明:与振型分解反应谱法相比,等效扭矩近似法在侧扭周期比大于1.8时具有较好的计算精度,但在侧扭周期比接近1.0时可能低估构件的内力值,在实际计算中应予修正以保证结构设计安全。
Two dynamical analysis methods are discussed in this paper for an accidental eccentricity during the computation of horizontal seismic responses of tall buildings.They are the modal response spectrum analysis method and the equivalent torque method.The results of two groups of structures demonstrated graphically in terms of the ratio of uncoupled lateral and torsional periods show that the equivalent method has a good precision when the ratio of periods is larger than 1.8.However,it may underestimate member forces if the ratio is close to 1.0.Therefore,a modified approach should be involved in applications.
Two dynamical analysis methods are discussed in this paper for an accidental eccentricity during the computation of horizontal seismic responses of tall buildings.They are the modal response spectrum analysis method and the equivalent torque method.The results of two groups of structures demonstrated graphically in terms of the ratio of uncoupled lateral and torsional periods show that the equivalent method has a good precision when the ratio of periods is larger than 1.8.However,it may underestimate member forces if the ratio is close to 1.0.Therefore,a modified approach should be involved in applications.
引文
[1]JGJ3-2002,高层建筑混凝土结构技术规范[S].北京:中国建筑工业出版社,2002.JGJ3-2002,Technical specification for concrete structures of tall building[S].Beijing:China Architecture Industry Press,2002.(in Chinese)
[2]BS EN 1998-1:2004,Eurocode 8:Design of structures for earthquake resistance–Part 1:General rules,seismic actions and rules for buildings[S].BSI:British Standards Institution,2004.
[3]UBC 97 Uniform Building Code Volume 2,Structural Engineering Design Provisions[S].International Conference of Building Officials,USA,1997.
[4]郭继武.建筑抗震设计(按新规范GB50011-2001)[M].北京:中国建筑工业出版社,2002.Guo Jiwu.Seismic design of buildings(under the new code GB50011-2001)[M].Beijing:China Architecture Industry Press,2002.(in Chinese)
[5]朱镜清.结构抗震分析原理[M].北京:地震出版社,2002.Zhu Jingqing.Principles for seismic analysis of structures[M].Beijing:Earthquake Press,2002.(in Chinese)
[6]Dimova S L,Alashki I.Seismic design of symmetric structures for accidental torsion[J].Bulletin of Earthquake Engineering,2003,1(2):303―320.
[7]Fahjan Y M,Tuzun C,Kubin Joseph.An alternative procedure for accidental eccentricity in dynamic modal analyses of buildings[C].Geneva,Switzerland:First European Conference on Earthquake Engineering and Seismology,2006:1166―1175.
[8]De La Llera J C,Chopra A K.Using accidental eccentricity in code-specified static and dynamic analyses of buildings[J].Earthquake Engineering and Structural Dynamics,1994,23(9):947―967.
[9]孙建华.偶然偏心引起的地震效应研究[D].北京:中国建筑科学研究院,2001.Sun Jianhua.Study on earthquake effect caused by accidental eccentricity[D].Beijing:China Academy of Building Research,2001.(in Chinese)
[10]刘畅.地震作用下偏心结构扭转反应研究[D].长沙:湖南大学,2007.Liu Chang.Study on torsional response of eccentric structures under seismic action[D].Changsha:Hunan University,2007.(in Chinese)
[11]Hejal R,Chopra A K.Earthquake response of torsionally coupled frame buildings[J].Journal of Structural Engineering,1989,115(4):834―851.
[12]Hejal R,Chopra A K.Lateral-torsional coupling in earthquake response of frame buildings[J].Journal of Structural Engineering,1989,115(4):852―867.
[13]胡海昌.多自由度结构固有振动理论[M].北京:科学出版社,1987.Hu Haichang.Natural vibration theory of multi-degree-of-freedoms structures[M].Beijing:Science Press,1987.(in Chinese)
[2]BS EN 1998-1:2004,Eurocode 8:Design of structures for earthquake resistance–Part 1:General rules,seismic actions and rules for buildings[S].BSI:British Standards Institution,2004.
[3]UBC 97 Uniform Building Code Volume 2,Structural Engineering Design Provisions[S].International Conference of Building Officials,USA,1997.
[4]郭继武.建筑抗震设计(按新规范GB50011-2001)[M].北京:中国建筑工业出版社,2002.Guo Jiwu.Seismic design of buildings(under the new code GB50011-2001)[M].Beijing:China Architecture Industry Press,2002.(in Chinese)
[5]朱镜清.结构抗震分析原理[M].北京:地震出版社,2002.Zhu Jingqing.Principles for seismic analysis of structures[M].Beijing:Earthquake Press,2002.(in Chinese)
[6]Dimova S L,Alashki I.Seismic design of symmetric structures for accidental torsion[J].Bulletin of Earthquake Engineering,2003,1(2):303―320.
[7]Fahjan Y M,Tuzun C,Kubin Joseph.An alternative procedure for accidental eccentricity in dynamic modal analyses of buildings[C].Geneva,Switzerland:First European Conference on Earthquake Engineering and Seismology,2006:1166―1175.
[8]De La Llera J C,Chopra A K.Using accidental eccentricity in code-specified static and dynamic analyses of buildings[J].Earthquake Engineering and Structural Dynamics,1994,23(9):947―967.
[9]孙建华.偶然偏心引起的地震效应研究[D].北京:中国建筑科学研究院,2001.Sun Jianhua.Study on earthquake effect caused by accidental eccentricity[D].Beijing:China Academy of Building Research,2001.(in Chinese)
[10]刘畅.地震作用下偏心结构扭转反应研究[D].长沙:湖南大学,2007.Liu Chang.Study on torsional response of eccentric structures under seismic action[D].Changsha:Hunan University,2007.(in Chinese)
[11]Hejal R,Chopra A K.Earthquake response of torsionally coupled frame buildings[J].Journal of Structural Engineering,1989,115(4):834―851.
[12]Hejal R,Chopra A K.Lateral-torsional coupling in earthquake response of frame buildings[J].Journal of Structural Engineering,1989,115(4):852―867.
[13]胡海昌.多自由度结构固有振动理论[M].北京:科学出版社,1987.Hu Haichang.Natural vibration theory of multi-degree-of-freedoms structures[M].Beijing:Science Press,1987.(in Chinese)
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