强柱系数对多层钢框架结构动力响应的影响

Influence of the Strong-column Factor on Dynamic Response of Multi-story Steel Frame Structures

为明确强柱系数的大小和不同定义形式对典型多层钢框架结构动力响应的影响,以不同强柱系数值(0.9~1.5)和不同定义形式(结构层定义、结构的柱梁节点定义)为研究参量,设计柱脚刚接的典型多层钢框架结构模型,通过强震下的动力时程分析,研究结构模型的最大层间位移、最大层间位移角集中率及构件的塑性变形能量等变化规律。通过研究发现,随着强柱系数的减小,各模型最大层间位移变形及构件塑性变形能量呈现向首层集中的趋势,强柱系数≤1.2且按柱梁节点设计的模型尤其明显,其位移角集中率也较大;而强柱系数≥1.5的模型塑性变形能量基本分布于梁,且分散于1~6层。各模型的地震输入能量速度换算值和塑性变形能量速度换算值大小取决于结构模型的基本周期,与强柱系数大小和定义形式无关。

In order to clarify the influence of the magnitude and different definition of the strong-column factor on dynamic response of the typical multi-story steel frame structures,a typical multi-story steel frame structures model with rigid column-foot connections is designed by taking the magnitude of the strong-column factor(0.9~1.5)and different definitions forms(structural layer definition、structure of the column beam node definition)as the main research parameters,through the dynamic time-history distribution under strong earthquake,the maximum story drift,the maximum story drift angle concentration ratio and plastic deformation energy of the structural model are studied.The results are as follows:With the decrease of the strong-coulmn factor,the maximum story drift and plastic deformation energy of the structural tend to concentrate on the first floor,especially for the model with the strong-column factor less than 1.2,and the drift angle concentration ratio is larger;But the plastic deformation energy of the model with the strong-column factor more than 1.5 basically distributes in the beam and is dispersed in the first layer to the six layer.The seismic input energy velocity conversion value and plastic deformation energy velocity conversion value depend on the basic period of the structural model,and have nothing to do with the strong-column factor and definitions forms.