Experimental study on seismic behavior of recycled aggregate concrete infilled profile steel structures

To alleviate the shortage of river sand and the pollution of construction waste, this paper proposed the recycled aggregate concrete (RAC) and its application in structures. Two specimens at 1:2 scale are tested under quasi-static cyclic load, and the results were verified by the finite element model (FEM). The specimen KJ-1 is a frame structure composed of the steel tube column with RAC infilled profile steel and the H-shaped steel beam, and the specimen KJ-W is a frame-shear wall structure composed of the steel tube column with RAC infilled profile steel, the H-shaped steel beam and reinforced concrete shear wall. The failure mode of the specimens is presented. Based on the experimental data, the hysteresis curves, skeleton curves, ductility, energy dissipation capacity, and stiffness degradation of the specimens are analyzed. The difference of peak bearing capacity of specimens with different RAC structures is 15.2