高强钢组合偏心支撑框架抗震性能研究

Seismic Performance of High-strength-steel Composite Eccentrically Braced Frames

高强钢组合K型偏心支撑框架耗能梁段和支撑采用Q345钢,其余构件采用Q460钢,不仅能有效减小构件截面、节约钢材、降低造价,而且有助于推广高强钢的应用。为了比较高强钢组合K型偏心支撑框架与Q345钢K型偏心支撑框架的抗震性能,在试验研究的基础上,设计两组共8个不同层数的高强钢组合K型偏心支撑框架与Q345钢K型偏心支撑框架,并分别对其进行非线性静力推覆分析和动力时程分析,对比分析两种结构形式的承载力、刚度、延性以及地震作用下层间变形能力和耗能梁段。结果表明:在满足抗震性能要求的前提下,相同设计条件下高强钢组合K型偏心支撑框架变形略差于Q345钢K型偏心支撑框架,但是其构件截面较小,可以节省钢材,降低工程造价,具有较高的经济效益。

In high-strength-steel composite eccentrically braced frames （HSS-EBFs）, links and braces are made of Q345 steel, whereas other structural members are made of Q460 steel. This structure can reduce member section sizes and thus the weight of the steel and achieve improved economic efficiency by reducing the amount of steel used and applying HSS. To compare the seis- mic performance of K-type HSS-EBFs （K-HSS-EBFs） with traditional K-type EBFs （K-EBFs）, in this study, we designed four K-HSS-EBFs and four K-EBFs of different structural heights. We used nonlinear static pushover analysis and nonlinear dynamic analyses to investigate the seismic performance of the K-HSS-EBF and K-EBF models. The results indicate that both K-EBFs and K-HSS-EBFs well satisfy seismic requirements and that the deformation of the K-HSS-EBFs was more obvious than that of the K-EBFs. However, the comparatively smaller member section sizes of the K-HSS-EBFs can reduce the steel weight and project building costs.