PSEUDODYNAMIC TEST ON JOINTED PRECAST CONCRETE FRAME STRUCTURES

摘要

The seismic behavior of precast concrete frame structures is greatly influenced by the performance of beam-to-column connections. The connections can be classified into emulation monolithic connections and jointed connections. However, the studies in jointed connections and structures are much less than those in emulation monolithic connections and structures during the past twenty years. The pseudodynamic tests of two jointed precast concrete frame structures including one frame with one floor and double spans, one frame with one floor, single span, and three bays have been carried out to investigate the seismic behavior of jointed precast concrete structures on failure mechanism, strength, ductility, hysteretic characteristics and energy dissipation. The precast beams and columns were assembled together with a prestressed bolt and a rubber cushion inserted between beam and column in the connections. The test results showed that this kind of jointed precast concrete structures can provide satisfactory seismic performance. When drift angle arrived at 1/25 the structures still held enough carrying capacity. The beam-to-column connections with rubber cushion and bolt worked well and the failure pattern of the structures was ductile with column bending failure, and the displacement ductility factor was larger than 3.5.