Seismic Behaviour of Beam-Column Joints of Precast and Partial Steel Reinforced Concrete

A beam-column joint of precast and partial steel reinforced concrete （PPSRC） is proposed for precast reinforced concrete frames. The PPSRC consists of partial steel and reinforced concrete. The partial steel is located in the core joint region and the connections between concrete members. This paper presents an experimental study of a series of PPSRC specimens. These specimens are tested under low cyclic loading. Experimental results demonstrate that the bearing capacity of the PPSRC specimens is 3 times that of the ordinary reinforced concrete （RC） beam-column joints. The strength and stiffness degradation rates are slower compared with that of the RC beam-column joints. In addition, the strength of the core joint region and the connections is higher than other parts of the PPSRC specimens. Beam failure occurs firstly for the PPSRC specimens, followed by column failure and connections failure. The failure of the core joint region occurs finally. Test results show that the seismic performance of the PPSRC is better than that of the ordinary RC beam-column joints.