Seismic Performance of Precast Shear Walls Using Fibre-reinforced Recycled Brick Aggregate Concrete

A new type of construction combined with fibre materials for prefabricated shear wall structures is proposed to improve the seismic performance of conventional regenerated brick concrete shear walls. Four fibre-reinforced recycled brick concrete precast shear walls (PFRBCSWs) composed of restraint boundary elements (RBE) and the corresponding monolithic specimen were constructed and tested under an in-plane reversed cyclic loading. The experimental results indicate that: (1) Compared with the monolithic specimen, the difference in the bearing capacity of PFRBCSWs is within 20%, and the energy consumption capacity at each stage is slightly higher. (2) Fibres could significantly improve the initial stiffness and energy dissipation capacity of PFRBCSWs, and effectively restrain the crack development. (3) The hybrid fibre-reinforced wall structure (S-PFPW) achieves the highest initial stiffness and energy dissipation capacity, but has poor ductility and bearing capacity. Numerical simulation of the tests were conducted, and parameter studies were carried out for the aspect ratio and axial compression ratio of PFRBCSWs, as well as the reinforcement ratio of the RBE. The shear resisting mechanisms of PFRBCSWs are analysed based on the softened strut-and-tie mode. The predicting formula for bearing capacity is proposed, and it fits well with the experimental results.