不同顶层连接多层规则钢框架连体结构动力响应研究

Dynamic responses research of multistory inerratic steel frame connected structure with different top connections

为了研究不同顶层连接的多层规则钢框架连体结构动力响应机理,以基本周期、首层剪重比为主要参数,建立3个不同强度和刚度的多层规则钢框架单体模型。单体模型通过不同形式的顶层连接构成连体模型,对各连体模型进行弹塑性时程分析,探讨其动力反应。结论如下:(1)常遇地震作用下,梁式连接有一定的连接效果;罕遇地震作用下,3种形式的连接效果均不明显;总体看,梁式或梁+楼板式连接的效果优于层式连接。(2)连体模型强侧的强度及刚度足够大时,层式连接有利于塑性变形能量集中连体模型强侧,而梁式连接及梁+楼板式连接有利于塑性变形能量集中在连体模型的弱侧;不同连接形式对连体模型的塑性变形总能量无明显影响。(3)梁式连接时连接构件有较大的轴向力。

In order to obtain the dynamic responses mechanism of multi-layer inerratic steel frame connected structure with different top connections,3 single models of multi-layer steel frame are established based on the main parameters such as the fundamental period and shear-gravity ratio of the first floor. Then,the integrated models consist of single models with different top connections,and the elastic-plastic time-history analysis of the integrated models is carried out to find out the dynamic responses. The results show that the integrated model with the beamconnecting form has a certain connection effect under frequent earthquake. However,the connecting effect of all the three connection forms for the integrated model is not obvious under rare earthquake. But in all,the connecting effects of the beam or beam-slab connection are better than that of layer connection. It is found that the layer connection is beneficial to the concentrating of the plastic deformation energy in the stronger side of the integrated model whose strength and rigidity are big enough,while the beam or beam-slab connection is beneficial to the concentrating of the plastic deformation energy in the weaker side of the integrated model. However,there is no obvious effect of the different connecting forms on the total plastic deformation energy of the integrated model.Finally,it is obvious that there is bigger axial force in the connecting structures when the integrated model connected by the beams.