Experimental study on seismic behavior of recycled steel tubular columns

Abstract

In order to study the seismic performance of recycled steel tubular columns, four round steel tube recycled concrete columns were designed and fabricated, and low-cycle reciprocating tests were carried out. Considering the two parameters of regenerative coarse aggregate replacement rate and axial compression ratio, the whole process and failure mode of the specimen were observed, and the hysteresis curve, skeleton curve and stiffness degradation of the specimen were analyzed. The experimental results show that the failure process and failure modes of the recycled steel tubular columns are similar to those of ordinary circular steel tubular columns. The main performance is the drum bending of the steel pipe at the root of the test piece; the hysteresis curve of the test piece is full, and the replacement ratio of coarse aggregate is opposite. The hysteresis curve of the specimen has little effect, and the axial compression ratio has a great influence on the shape of the hysteresis curve, the skeleton curve, and the stiffness degradation. The recycled steel tubular column has good seismic performance.