Abstract
This paper presents the results of an experimental investigation aimed at the development of moment connections for precast reinforced concrete members. Two types of moment connections were tested. Type 1 moment connections are made by welding reinforcing bars protruding from the column to a steel plate welded to the tension reinforcement of the beam. Type 2 moment connections are made by welding a continuity plate to two other steel plates, one welded to the reinforcement of the beam and the other affixed to the face of the column by means of studs. The testing program comprised 15 specimens including four monolithic joints of the same geometry as specimens of types 1 and 2, introduced to compare the behaviour of cast-in-place and precast structures.The test results indicate that type 1 moment connections have almost the same strength and stiffness as monolithic joints but are less ductile. In type 2 moment connections, brittle fracture occurred at bending moments much lower than the ultimate strength of the beams. Some modifications are suggested in the paper in order to improve the behaviour of the two types of moment connections.
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