Seismic Behavior of Steel Beam to Concrete-Filled Circular Steel Tube Column Connections
|關鍵字:||梁柱接頭;實尺寸試驗;夾型鋼板;鋼管混凝土柱;beam-to-column;full-scale test;clamping plate;concrete-filled tube column|
Concrete-filled tube (CFT) columns possess several structural advantages such as stiffness, strength, and ductility. However, it is difficult to joint the steel beam to the circular CFT column due to its complexity. This research proposed a connection detail, which is by penetrating a pair of clamping plates through the tube and welding to the steel beam. The force-transferred mechanism of the connection is established by transferring the beam flange forces into the tube and concrete core through those clamping plates. Four large-scale specimens were designed and fabricated to identify the possible failure mode. Test results indicate that the penetrated clamping plate connections possess the satisfactory connection strength and inelastic deformation ability required for the moment connection when the shear strength in the joint is adequately designed. Joint shear failure, presented by the shear cracking on the concrete inside the tube, is the controlled mode of failure for the flange plate connection with weak joint shear strength. The clamping plates are effective to transfer the beam flange forces into the concrete core. Proposed softened strut-and-tie model can predict the joint shear strength well.