EXPERIMENTAL INVESTIGATION OF PRECAST CONCRETE BEAM TO COLUMN CONNECTIONS SUBJECTED TO REVERSED CYCLIC LOADS

Two types of precast and one type of monolithic full scale beam-column connections are tested under reversed cyclic loads. Both of the precast concrete connections tested were cast in place, but with different connection details, namely straight spliced (PC1) and U-shaped (PC2). The straight spliced and U-shaped connections were located in the beam and column of the precast concrete subassemblies. Hysteresis response, strength, stiffness, damping and energy dissipation of monolithic and precast connections were studied and then compared together. Monolithicspecimen (MO) indicated a good behavior in terms of integrated seismic parameters. The experimental results shows that Specimen PC1 in which the top and bottom reinforcement are continued by lap splicing treated a good behavior very similar and closed to those of control monolithic specimen and preformed very good based on seismic demand. The behavior of Specimen PC2 that U-shaped rebars were used in its connection was not satisfactory in comparison with other specimens. Some shear deteriorations observed in both PC1 and PC2 connections. As conclusion, connections PC1 and PC2 are suggested in precast moment resisting frames with moderate ductility located in high seismic zones. However, some essential practice-oriented modifications are required.

کلیدواژه ها:

Precast Concrete Connections ، Moment Resisting Frames ، Reversed Cyclic Loads ، Energy Dissipation ، Ductility Ratio