Experimental investigation on seismic behavior of PVA-steel hybrid fiber reinforced cementitious composite beam-column assemblages
Han Jianping1,2 Liu Wenlin1,2 Cui Ming1,2
1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou 730050, China;
2. Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050, China
In order to restrain the shear crack formation and the slip of the longitudinal reinforcement bars embedded in the beam concrete, replacing ordinary concrete with PVA-steel hybrid fiber reinforced cementitious composite (HyFRCC) is one of the optional measures to improve the seismic performance of reinforced concrete beam-column assemblages. 8 beam-column assemblage specimens were designed to investigate the seismic behavior of HyFRCC beam-column assemblages by quasi-static tests. 6 of them are PVA-steel HyFRCC assemblages, and the other 2 specimens are PVA fiber reinforced cementitious composite assemblage and ordinary reinforced concrete assemblage respectively for comparison. The hysteretic behavior, backbone curve, ductility and energy dissipation capacity were investigated under cyclic load for various fiber content. Experimental results show that the addition of fibers effectively inhibits the formation and development of shear cracks, and the bearing capacity, ductility and energy dissipation capacity of beam-column assemblages are significant improved. The seismic behavior of HyFRCC assemblages is better than that of PVA fiber reinforced cementitious composite assemblage whether before or after peak loading.
