Y型偏心支撑半刚性连接钢框架动力性能研究

STUDY ON DYNAMIC PERFORMANCE OF Y-TYPE ECCENTRICALLY BRACED SEMI-RIGID CONNECTION STEEL-FRAMED STRUCTURES

Y型偏心支撑既能提供足够的弹性刚度,又能使结构具有很好的抗震性能;半刚性节点对钢框架结构的性能影响很大,在进行钢框架结构设计时必须要考虑半刚性的影响。将Y型偏心支撑与半刚性连接结合起来的结构形式是一种新型抗震结构体系。运用结构通用有限元软件MIDAS GEN建立不同连接刚度的半刚性连接Y型偏心支撑钢框架模型。并对其进行模态分析、多遇地震下和罕遇地震下的时程分析,得到各不同连接刚度Y型偏心支撑钢框架的自振周期、层间位移、层间位移角及顶点时程位移曲线。通过对比分析可知,半刚性连接对Y型偏心支撑钢框架的抗侧刚度有很大影响,半刚性连接可以很好地改善结构的抗震性能。Y型偏心支撑与半刚性节点都可以提高结构的抗震性能,两者相结合的结构形式有很好的应用前景。

Y-type eccentric brace can provide enough elastic stiffness, and make steel frame have very good seismic performance. Influence of the semi-rigid connection on structure performance is significant and should be considered in the steel frame structure design. Y-type eccentric braced steel frame combined with semi-rigid connection is a new type of seismic structure system. In this study, Y-type eccentrically braced steel frame models with different nodes of connected stiffness were set up by the general structure finite element software MIDAS GEN. Natural vibration period of the structures and time-history curves of story drift, story drift angle and the top floor displacement were obtained for different connection stiffness by modal analysis and time history analysis under frequent earthquake and rare earthquake. Through the comparative analysis, the semi-rigid connection has prominent effect to lateral stiffness of Y-type eccentrically braced steel frame and can be very good to improve the structure seismic performance. The combination of Y-type eccentric brace and semi-rigid connection can improve the structure seismic performance and has a good application prospect.