ABSTRACT
A series of experimental tests were conducted to investigate the behavior of an innovative post-tensioned (PT) top-and-seat-angle wide flange (WF) beam-to-column moment connection for steel moment resisting frames subjected to seismic loading conditions. Nine large-scale specimens were tested. Each specimen represented an interior connection and consisted of two WF beams attached to a column. The parameters investigated in the study include the angle size, angle gage length, beam flange reinforcing plates, connection shim plates, and post-tensioning force. The results of the test program demonstrate that post-tensioned connections possess exceptional cyclic strength and ductility. Energy dissipation occurs in the angles while other structural members remain elastic. The initial elastic stiffness is comparable to that of a welded connection, and following severe inelastic cycles of drift the connection has little permanent deformation. The angle parameters are shown to influence the connection moment capacity and energy dissipation. Therefore, experimental investigations were carried out on the angles alone to better evaluate the effects of angle size and angle gage length on the PT connection behavior.
