SEISMIC BEHAVIOR TEST OF FIBER-REINFORCED RECYCLED CONCRETE PREFABRICATED COMPOSITE WALLS

To promote the research and application of recycled concrete and study the mechanical properties of fiber-reinforced recycled concrete(FRC) precast composite wallboard, two FRC prefabricated composite wall specimens and one ordinary concrete prefabricated composite wall specimen were designed and tested. The experiment aimed to study the failure phenomenon, failure mechanism and hysteresis characteristics of FRC prefabricated composite walls, and to explore the influence of different precast wallboard materials on stiffness degradation, strength degradation, deformation curve, energy dissipation capacity and residual deformation rate of the wall. The test results showed that FRC prefabricated composite walls showed an obvious bending-shear failure mode, and the stiffness degradation was gentle, which was consistent with the degradation law of ordinary concrete specimen; different materials mainly affected the stiffness on the yield point, and had almost no influence on the later stiffness; the strength degradation law of the three specimens was similar, while the strength degradation of FRC specimens was more stable than that of the ordinary concrete specimen after peak load. Compared with the ordinary concrete specimen, the peak load of two FRC specimens decreased by 2.1% and 2.6% respectively, and the ductility coefficient increased by 28.0% and 27.4% respectively. The FEC walls showed a good comprehensive performance and could be applied to 12-storey prefabricated composite wall structure based on effective design.