扭转控制指标在不等高接地框架结构中的适用性分析
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摘要
不等高接地框架结构具有先天竖向不规则性和上接地层柱底部约束存在差异的特点,其扭转效应更显著。通过理论和算例,分析了层间位移比、位移比、周期比三个扭转控制指标在不等高接地框架结构中的适用性。位移比适用于不等高接地框架结构的扭转效应判别,但可能出现位移比不起控制的情况,应与周期比限制相结合;由于耦联周期比随着相对偏心距的增大而减小,可能使不等高接地框架结构扭转效应判别失真,宜按非耦联周期比进行控制;上接地层的层间位移比的计算值可能失真,将导致对不等高接地框架结构扭转的误判。
Frame structure with uneven height grounding column ends has vertical irregularity,the constraints at the bottom of the columns in upper ground plane exist differences,so the torsional response should be more significant. Based on theory method and examples analyses,feasibility of storey drift displacement ratio,displacement ratio and period ratio for judged the torsional effect of frame structure with uneven height grounding column ends are analyzed. Displacement ratio can be used to judge torsional effect in frame structure with uneven height grounding column ends,but in some case displacement ratio should be used with period ratio. Because coupled period ratio decreases with increase of eccentricity of the structure,in some case it's easy to have a mistake in evaluated the torsional response of frame structure with uneven height grounding column ends,uncoupled period ratio is better than coupled period ratio. The value of storey drift displacement ratio of upper ground plane may be distorted,which may result in misjudgment of torsional response in frame structure with uneven height grounding column ends.
Frame structure with uneven height grounding column ends has vertical irregularity,the constraints at the bottom of the columns in upper ground plane exist differences,so the torsional response should be more significant. Based on theory method and examples analyses,feasibility of storey drift displacement ratio,displacement ratio and period ratio for judged the torsional effect of frame structure with uneven height grounding column ends are analyzed. Displacement ratio can be used to judge torsional effect in frame structure with uneven height grounding column ends,but in some case displacement ratio should be used with period ratio. Because coupled period ratio decreases with increase of eccentricity of the structure,in some case it's easy to have a mistake in evaluated the torsional response of frame structure with uneven height grounding column ends,uncoupled period ratio is better than coupled period ratio. The value of storey drift displacement ratio of upper ground plane may be distorted,which may result in misjudgment of torsional response in frame structure with uneven height grounding column ends.
引文
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[3]魏琏,王森.扭转不规则建筑竖向构件考虑扭矩影响的抗震验算方法[J].建筑结构,2006,36(7):8-20.WEI Lian,WANG Sen.Aseimic Analysis on Torsion Angle Effect of Vertical Members in Torsionally Irregular Structure[J].Building Structure,2006,36(7):8-20.(in Chinese)
[4]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 Peifu,HUANG Jifeng,WEI Chengi.Control of torsional response of tall building structures[J].China Civil Engineering Journal,2006,39(7):1-8.(in Chinese)
[5]陈才堡,安来.对建筑结构扭转不规则程度判别的研讨[J].建筑结构,2006,36(12):76-78.CHEN Caibao,AN Lai.Discussion on Judgement Index of Torsional Irregularity for Building Structure[J].Building Structure,2006,36(12):76-78.(in Chinese)
[6]钱稼茹,姜鋆.判别结构扭转不规则的位移比计算方法探讨[J].建筑结构,2006,36(12):79-81.QIAN Jiaru,JIANG Jun.Study on Calculating Methods of Displacement Ratio Used to Judge Structural Torsion Irregularity[J].Building Structure,2006,36(12):79-81.(in Chinese)
[7]蔡健,潘东辉,黄炎生.高层建筑结构扭转振动效应控制研究[J].工程力学,2007,24(7):116-121.CAI Jian,PAN Donghui,HUANG Yansheng.Research on Torsional Vibration Control of Tall Building Structures.Engineering Mechanics,2007,24(7):116-121.(in Chinese)
[8]李英民,韩军,刘建伟.建筑结构抗震设计扭转周期比控制指标研究[J].建筑结构学报,2009,30(6):77-85.LI Yingmin,HAN Jun,LIU Jianwei.Study on torsional period ratio control index for seismic design of building structures[J].Journal of Building Structures,2009,30(6):77-85.(in Chinese)
[9]JGJ3-2010,高层建筑混凝土结构技术规程[S].JGJ3-2010,Technical specification for concrete structures of tall building[S].
[10]刘立平,姬淑艳,李英民.山地建筑结构抗震设计特殊问题[C].第十一届高层建筑技术交流会,2007.LIU Liping,JI Shuyan,LI Yingmin.2007.Special Problems on a Seismic Design of Building Structures on the Slope[C].The 11th high-rise building technology communication meeting.(in Chinese)
[11]李英民,刘立平.汶川地震建筑震害与思考[M].重庆:重庆大学习出版社,2008.10.LI Yingmin,LIU Liping.Earthquake building damage and thinking of the Wen Chuan earthquake[M].Chongqing:Chongqing University Press,2008.10.
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