加侧板法梁柱连接节点用于D型偏心支撑结构的抗震性能分析

Seismic Behaviour Study of an Additive Side-Plate Protocol Used for D-Type Eccentrically Braced Steel Frames

D型偏心支撑钢框架是偏心支撑结构中常用的一种抗震耗能结构形式,但是其耗能梁段与柱直接相连,为了满足抗震设计要求,一般需要对梁柱连接节点处采取一些加强措施。本文提出了一种新型剪切型耗能梁段与柱连接节点-加侧板方案,并利用有限元分析程序,将该新型梁柱连接节点与梁柱直接相连的D型偏心支撑结构进行了理论分析比较。验证了该新型节点不仅可以使塑性铰远离柱端,而且可以放松钢柱对梁翼缘端部的局部变形约束,避免梁柱连接节点处焊缝的脆性断裂。

The D-type eccentrically braced steel frames with shear link provides an efficient structural system for resisting seismic activity, However, the connections for the shear link should be strengthened for meeting the design demand, This paper proposed a new connection protocol by adding side-plate between shear link and column. The behavior of the new protocol and the traditional protocol is compared by analysis with finite element program. The results indicate that the new protocol may draw the plastic hinge away from link flange welds, and relax the extreme local deformation in the link flanges near the column face in order to avoid the brittle fracture of the welds in the beam column connection.