基于性能设计的高强钢组合V型偏心支撑钢框架抗震性能研究

RESEARCH ON THE SEISMIC BEHAVIOR OF V-TYPED ECCENTRICALLY BRACED STEEL FRAMES WITH HIGH STRENGTH STEEL COMBINATION BASED ON PERFORMANCE DESIGN METHOD

为了研究高强钢组合V型偏心支撑钢框架的抗震性能,采用基于性能的抗震设计方法设计2个10层V型偏心支撑钢框架算例,采用Pushover方法和动力弹塑性方法进行分析。对比分析高强钢组合V型偏心支撑钢框架和普通V型偏心支撑钢框架的破坏特征、承载能力、基底剪力、顶点侧移角、抗侧刚度、延性以及罕遇地震下层间位移角。结果表明:在基于性能的抗震设计方法中,高强钢组合V型偏心支撑钢框架与普通钢组合V型偏心支撑钢框架具有相近的破坏模式和顶点侧移角,但抗侧刚度和延性略低;在罕遇地震作用下,两者具有相似的层间位移分布模式,高强钢组合V型偏心支撑钢框架层间位移角略大,但都能满足相关规范限值的要求,抗震性能相当。高强钢组合V型偏心支撑钢框架能节省钢材约10%,更符合绿色建筑的发展方向。

In order to study the seismic behavior of V-typed eccentrically braced steel frames with high strength steel,two groups of V-typed eccentrically braced steel frames were designed by performance-based seismic design（ PBSD）method,which includes two 10-story projects. Nonlinear Pushover analysis and nonlinear dynamic analysis were conducted to both designs. The failure features,bearing capacity,base shear,vertex angle of lateral,lateral stiffness,ductility and inter-story drift under the rare earthquake between HSS-EBFs and EBFs were compared. The results indicated that,under the method of performance-based seismic design,there were similar failure modes and vertex angle of lateral between Vtyped HSS-EBFs and V-typed eccentrically braced steel frames（ EBFs）,but the lateral stiffness and ductility index of Vtyped HSS-EBFs were a little lower. Under the rare earthquake,the similar inter-story drift between both of them and the inter-story drift of V-typed HSS-EBFs was a little larger,but could meet the requirements of the code limit and have similar seismic performance. The steel weight of HSS-EBFs was about 10% lower than that of EBFs,and more beneficial for the development of green building.