基于刚度退化的框架结构受力性能研究
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摘要
根据模型试验数据确定各变形阶段框架的实际抗侧刚度,采用框架抗推刚度退化系数对框架各楼层抗推刚度进行修正,再引入周期、剪力与侧移修正系数对弹性阶段的结构受力性能予以修正,提出一种考虑刚度退化时框架结构的计算方法,并给出具体计算步骤.以8层框架为例,探讨了抗侧刚度退化对结构受力性能的影响.结果表明:考虑结构的刚度退化,结构自振周期增大,楼层剪力减少,侧移增加,符合工程实际,且概念清晰,简单适用,能为现行规范的补充与完善提供参考.
The real stiffness of frame in different deformation phases was determined according to experimental data,and the stiffness degradation coefficient was adopted to revise the stiffness of each floor.By using the stiffness degradation coefficients of free vibration period,shear and lateral displacement,the structural behaviors were revised.A practical method for calculating the behaviors of frame structures considering the structural stiffness degradation was presented,and the calculation steps were given.An 8 storey frame was taken for the example,and the influence on the behaviors of the stiffness degradation was studied.It was shown from the example that the structural free vibration period increased,the structural shear of floor decreased,and the lateral displacement increased,if the stiffness degradation was considered.It accorded with engineering practice and its concept was clear,simple and suitable.The work of this paper will be helpful to the complementarities and consummate of the existing design codes.
The real stiffness of frame in different deformation phases was determined according to experimental data,and the stiffness degradation coefficient was adopted to revise the stiffness of each floor.By using the stiffness degradation coefficients of free vibration period,shear and lateral displacement,the structural behaviors were revised.A practical method for calculating the behaviors of frame structures considering the structural stiffness degradation was presented,and the calculation steps were given.An 8 storey frame was taken for the example,and the influence on the behaviors of the stiffness degradation was studied.It was shown from the example that the structural free vibration period increased,the structural shear of floor decreased,and the lateral displacement increased,if the stiffness degradation was considered.It accorded with engineering practice and its concept was clear,simple and suitable.The work of this paper will be helpful to the complementarities and consummate of the existing design codes.
引文
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[2]JGJ 3 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,2002.JGJ 3 2002.Technical specification for concrete structures of tallbuilding[S].Beijing:China Architecture&Building Press,2002.(In Chinese)
[3]KRAWI NKLER H,SENVIRATNA G D K.Pros and cons of apushover analysis of seismic performance evaluation[J].Engineer-ing Structure,1998,20(4):452-464.
[4]FAJFAR P,FISCHI NGER M.N2-a methodfor nonlinear seis-mic analysis of regular structures[C]//Proceedings of 9th WorldConference of Earthquake Engineering.Tokyo,Japan:Associa-tion for Earthquake Disaster Prevention,1988,5:111-116.
[5]尹华伟,易伟建.结构地震反应Pushover位移形状向量的选取[J].湖南大学学报:自然科学版,2004,31(5):88-93.YI N H W,YI WJ.Displacement shape vector selected for staticpushover analysis of the structural seismic responses[J].Journal ofHunan University:Natural Sciences,2004,31(5):88-93.(InChinese)
[6]武腾清.结构物动力设计[M].腾家绿,译.北京:中国建筑工业出版社,1984.WU T Q.Dynamical design of structures[M].Translated byTENGJ L.Beijing:China Architecture&Building Press,1984.(In Chinese)
[7]赵西安.钢筋混凝土高层建筑结构设计[M].北京:中国建筑工业出版社,1992.ZHAO X A.Concrete tall building construction design[M].Bei-jing:China Architecture&Building Press,1992.(In Chinese)
[8]沈蒲生.高层建筑结构设计例题[M].北京:中国建筑工业出版社,2004.SHEN P S.Design examples of tall building structures[M].Bei-jing:China Architecture&Building Press,2004.(In Chinese)
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