용접절감형 외다이아프램 형식에 따른 CFT기둥과 철골보의 접합성능평가

In this paper monotonic tests are performed to develop H-beam to circular CFT column full strength moment connections for constructability. The main components are external diaphragm plates bolted to the beam and partially welded to the whole circumference of the column. External diaphragm plates have been used to transfer the beam forces around the column. The inelastic behavior of the connections equipped with the diaphragm plates can be improved compared with the direct connections. However, stress concentration in the diaphragm plates led to fracture of the bolts in flange of the beam. In order to shift the fracture position from the column surface toward the beam, the effect of covering concrete for outside of CFT column was examined from tests, resulting in improvement of ultimate load capacity of connections.