볼트 미끄럼을 고려한 칼럼-트리 형식 철골모멘트 접합부의 회전성능평가

Abstract

In this paper, the rotation capacity of a column-tree type steel moment connection is analytically investigated with the consideration ofbolt-slip effects. To this end, nine specimens with the column-tree type steel moment connection were precisely modeled and materialand geometric nonlinear finite element analyses considering the bolt-slip, which the span-to-depth ratio and the beam depth are vari-ables in this study, were conducted. Its chord yield rotation capacity is larger than welded steel moment connection and its bearingforce redistribution occurs by the bolt-slip. As the span-to-depth ratio is getting larger, the flexural resisting capacity in the beginningpoint of the bolt-slip is decreased while the magnitude of the stiffness reduction and the yield rotation capacity is increased. There-fore, it can be found that a governing factor to determine the rotation capacity of the column-tree type steel moment connection is thespan-to-depth ratio. As a result, in order to achieve the reasonable seismic performance evaluation of the Korean existing column-treetype steel moment connection, the moment-rotation relationship considering the bolt-slip should be applied to.Key words : Column-tree type, Steel moment frame, Finite element analysis, Seismic, Rotation capacity evaluation