带穿层柱钢框架结构受力机理研究  

Study on mechanical performance of steel frame structures with cross-story column

作　　者：范重[1] 王祥臻 张康伟 王海波[1] 王晶 吴徽 FAN Zhong;WANG Xiangzhen;ZHANG Kangwei;WANG Haibo;WANG Jing;WU Hui(China Architecture Design and Research Group,Beijing 100044,China;Planning and Construction Administration of Hebei Xiong'an New Area Management Committee,Xiong'an 071700,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China;School of Civil Engineering and Transportation,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]中国建筑设计研究院,北京100044 [2]河北雄安新区管理委员会规划建设局,河北雄安071700 [3]清华大学土木工程系,北京100084 [4]北京建筑大学土木与交通工程学院,北京100044

出　　处：《建筑结构学报》2021年第9期135-147,共13页Journal of Building Structures

基　　金：“十三五”国家重点研发计划(2016YFC0701201);中国建设科技集团科技创新基金项目(Z2020C01)。

摘　　要：为了研究带穿层柱框架结构的受力机理,将穿层柱高度范围的剩余框架视为子结构,采用广义反弯点法(D值法)确定结构的侧向刚度。考虑穿层柱占比、穿层柱高度对结构侧向刚度比、自振周期、构件内力以及层间位移角的影响,给出了实用的评估方法。通过考虑同层框架柱相互作用的影响,合理确定有侧移框架穿层柱的计算长度系数。分别采用静力弹塑性分析与动力弹塑性时程分析对带穿层柱框架结构进行罕遇地震作用分析。计算结果表明:随着穿层柱数量与穿层柱高度增大,结构的侧向刚度比减小,基本自振周期延长,最大层间位移角增大,柱剪力分配显著变化;穿层柱顶楼层框架梁轴力存在突变,该层楼盖在协调结构变形与内力分配方面具有较大作用,在设计时需要适当加强;在确定有侧移框架穿层柱的计算长度时,可考虑同层框架柱相互作用的影响,对穿层柱的计算长度系数进行修正;穿层柱的弹性刚度较小,在罕遇地震作用下进入塑性较晚,故此其分担的剪力显著增大;随着穿层柱数量减少、穿层柱高度增大,塑性阶段剪力分担率增幅加大。提出的基于穿层柱数量与穿越层数的地震力放大拟合计算式,可用于穿层柱塑性阶段剪力占比放大倍数估算。In order to study the mechanical performance of steel frames with cross-story column, the residual frame in the height range of cross-story column was regarded as a substructure. The lateral resistant stiffness of the structure with cross-story column was determined by improved inflection point method(D-value method). The influences of the contribution ratio and height of cross-story columns on the lateral stiffness ratio of the structure, the natural vibration period, the internal forces of the member and inter-story drift ratio were considered. The practical evaluation methods were presented. By considering the interaction of the frame columns in the same floor, the effective length factor of the cross-story column frame was reasonably determined. Both static and dynamic elastoplastic methods were applied to analyze the seismic performance of frames with cross-story column under rare earthquakes. The calculation results show that as the number and height of the cross-story columns increase, the lateral stiffness ratio of the structure decreases, the natural vibration period and the maximum inter-story drift ratio increase, and the shear force distribution between columns changes significantly. A sudden increase in the axial force of the frame beams on the top floor of the connected cross-story column is observed. The floor system plays a key role in coordinating structural deformation and internal force distribution, where special consideration is needed to achieve a proper design. When determining the effective length of the cross-story column within a laterally shifted frame, the influence of the interaction of the same-story frame columns can be considered, and the effective length factor of the cross-story column should be corrected.The elastic stiffness of cross-story columns is relatively small, which results in the relatively late formation of plastic hinges under rare earthquakes. Thus, the proportion of shear force bearing increases significantly. As the number of cross-story columns decreases and the

关 键 词：钢框架 穿层柱 抗侧刚度 受力特点 计算长度系数 弹塑性分析 

分 类 号：TU391.02[建筑科学—结构工程] TU318.1