论文部分内容阅读
为研究强震作用下柱脚连接刚度对多层钢框架结构抗震性能的影响,利用有限元程序OpenSEES建立了一个4层3跨的钢框架模型,对两种柱脚连接(刚接和半刚接)分别进行罕遇地震下的弹塑性时程分析,对比了结构整体响应、构件滞回曲线、塑性耗能分布等方面的特征。研究结果表明:对于本文所述结构采用半刚接时在罕遇地震下也是安全的,最大层间位移角沿高度的分布趋于均匀;柱脚连接为半刚接,即允许柱脚发生转动承担部分弯矩时,能够提高钢柱的塑性变形能力,防止钢柱底部发生局部屈曲和强度退化;同时整个结构具有更大的延性,地震作用下发生塑性变形和吸收能量的能力增强,使结构具有更大的耗能潜力来防止整个结构发生破坏。
In order to study the effect of the stiffness of column-foot connection on the seismic behavior of multi-story steel frame under strong earthquake, a 4-storey, 3-span steel frame model was established by finite element program OpenSEES. Then, the elastic-plastic time-history analysis under rare earthquakes was carried out separately. The characteristics of overall structure response, member hysteresis curve and plastic energy dissipation distribution were compared. The results show that for the structure described in this paper, the semi-rigid joint is also safe under rare earthquakes and the distribution of the maximum inter-floor displacement angle tends to be uniform along the height. The connection of the column foot to the semi-rigid joint allows the rotation of the column foot To take part of the bending moment, it can improve the plastic deformation capacity of the steel column to prevent local buckling and strength degradation of the steel column at the bottom. At the same time, the whole structure has more ductility, plastic deformation and energy absorption under seismic action, Have greater potential for energy consumption to prevent damage to the entire structure.