Experimental study on a new precast unbonded post-tensioned beam-column joint system with shear bracket

Abstract

In this study, new type of precast unbonded post-tensioned exterior beam-column joint of a long span frame was proposed and tested under the simultaneous action of gravity and cyclic load. The connection was designed with shear bracket to resist the shear force induced by the gravity load and post-tensioned steel to resist moment and shear force due to the earthquake load. The design concept is to control the deformation due to the earthquake load by accepting the opening between the beam and column interface in order to keep away from the damage to the beam and the column. The test results showed efficient seismic behaviors with minor cracks occurred in the beam and column, good self-centering behavior and small beam slip.