平面不规则钢筋混凝土框架结构基于性能的抗震评估方法
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摘要
从现行规范对平面不规则结构的限制条件出发,推导扭转角与扭转位移比的关系式,结合钢筋混凝土框架结构在不同地震作用水平下的层间位移角限值,建立平面不规则结构的层间扭转角需求曲线;依靠现有有限元分析程序计算结构构件的扭转角和扭转角能力曲线,提出平面不规则钢筋混凝土框架结构基于性能的抗震评估方法——扭转角能力谱法。通过算例对扭转角能力谱法的使用方法和原理进行阐述,建立平面不规则结构的评估曲线,分析结构不同楼层各构件的扭转变形性能。结果表明,扭转角能力谱法既可以一目了然地判别出楼层与楼层之间的扭转变形关系,又可以准确地判别出同一楼层各抗侧力构件的扭转变形性能,从而全面的实现各构件基于性能的抗震评估。
Based on the provisions on irregular plane structures in the China technical specification for tall buildings, the relationship between inter-story torsion angle and torsion deformation ratio is derived. Considering the inter-story ratio limit values for performance levels under different earthquake hazard levels, a series of torsion angle demand curves are established. Using existing finite element analysis software, the structural torsion angle and capacity curves are obtained. A new method named torsion angle capacity spectrum method is put forward for performance based seismic evaluation of irregular plan frame structures. Examples are presented to explain the method principle and to demonstrate the applicability and utility of the proposed method. The evaluation curves are established and the torsional deformation is analyzed. It is concluded that the new method can identify the torsional displacement not only between stories but also among structure members within the same story.
Based on the provisions on irregular plane structures in the China technical specification for tall buildings, the relationship between inter-story torsion angle and torsion deformation ratio is derived. Considering the inter-story ratio limit values for performance levels under different earthquake hazard levels, a series of torsion angle demand curves are established. Using existing finite element analysis software, the structural torsion angle and capacity curves are obtained. A new method named torsion angle capacity spectrum method is put forward for performance based seismic evaluation of irregular plan frame structures. Examples are presented to explain the method principle and to demonstrate the applicability and utility of the proposed method. The evaluation curves are established and the torsional deformation is analyzed. It is concluded that the new method can identify the torsional displacement not only between stories but also among structure members within the same story.
引文
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[9]GB50011—2001建筑抗震设计规范[S](GB50011—2001Code for seismic design of buildings[S](in Chinese))
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[2]Aschheim M,Black E F.Yield point spectra for seismic design and rehabilitation[J].Earthquake Spectra,2000,16(2):317-336
[3]Sullivan T J,Calvi G M,Priestley M J N,et al.The limitations and performances of different displacement based design methods[J].Journal of Earthquake Engineering,2003,7(S1):201-241
[4]戴君武,张敏政,黄玉壟．偏心结构扭转振动研究中几个基本参量的讨论[J].地震工程与工程振动,2002,22(6):38-43(Dai Junwu,Zhang Minzheng,Huang Yulong.Discussion on several basic parameters in study of seismic torsional effects of asymmetric structures[J].Earthquake Engineering and Engineering Vibration,2002,22(6):38-43(in Chinese))
[5]Chopra A K,Goel R K.Inelastic seismic response of one-story,asymmetric-plan systems:effects of system parameters and yielding[J].Earthquake Engineering and Structural Dynamics,1991,20(1):201-222
[6]徐培福,黄吉锋,韦承基.高层建筑结构在地震作用下的扭转振动效应[J].建筑科学,2000,16(1):1-6(Xu Peifu,Huang Jifeng,Wei Chengji.Response of torsional vibration of tall building structures induced by seismic action[J].BuildingScience,2000,16(1):1-6(in Chinese))
[7]Chandler A M,Correnza J C,Hutchinson G L.Period-dependent effects in seismic torsional response of code systems[J].Journal of Structural Engineering,1994,120(12):3418-3434
[8]魏琏,王森,韦承基.水平地震作用下不对称不规则结构抗扭设计方法研究[J].建筑结构,2005,35(8):12-17(Wei Lian,Wang Sen,Wei Chengji.Torsional design method ofasymmetric and irregular buildingunder horizontal earthquake action[J].Building Structure,2005,35(8):12-17(in Chinese))
[9]GB50011—2001建筑抗震设计规范[S](GB50011—2001Code for seismic design of buildings[S](in Chinese))
[10]JGJ3—2002高层建筑混凝土结构技术规程[S](JGJ3—2002Technical specification for concrete structures of tall building[s S](in Chinese))
[11]门进杰.不规则钢筋混凝土框架结构基于性能的抗震设计理论和方法[D].西安:西安建筑科技大学,2007(Men Jinjie.Theory and methods of performance based seismicdesign for irregular reinforced concrete frame structures[D].Xi’an:Xi’an University of Architecture and Technology,2007(in Chinese))
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