Abstract:
This study designed a prefabricated reinforced concrete column (PRCC) with steel fiber reinforced sulphoaluminate cement concrete joints using longitudinal reinforcement lapping featuring early strength, high strength, convenient assembly and low precision requirements. To investigate the seismic performance of this type of PRCCs, pseudo-static tests were conducted on the PRCC specimens with two kinds of lapping lengths (i.e. 100 mm and 300 mm) and one cast-in-place reinforced concrete column (CRCC) specimen. The results show that the damage level of post-earthquake concrete of PRCCs is far lower than that of CRCC. The seismic performance of PRCCs is improved when the lapping length increased. Seven days after the pouring of steel fiber sulphoaluminate cement concrete, compared to the CRCC, the peak loads of PRCCs with lapping lengths of 100 mm and 300 mm decrease by 14.75% and 1.24%, respectively, while the initial stiffness decreases by 57.09% and 11.63%, and cumulative energy dissipation decreases by 71.32% and 13.61%. In addition, the ductility coefficient of the PRCC with the lapping length of 300 mm increases by 6% compared to the CRCC. As the lapping length reaches 300 mm, the PRCC can basically achieve the same bearing capacity, stiffness and energy dissipation capacity as those of CRCC, as well as better post-earthquake integrity and ductility compared to cast-in-place CRCC.