Axial Compressive Performance of L-Shaped Columns Composed of RAC-Filled Steel Tubes

This paper discusses the application of recycled aggregate concrete (RAC) in novel special-shaped concrete-filled steel tube (CFST) columns and presents an axial compressive test of the L-shaped column composed of recycled aggregate concrete-filled steel tubes (RACFST). The replacement ratio of recycled coarse aggregate (RCA) was changed to explore the axial compression performance of the columns in comparison with the L-shaped hollow section columns. The results show that with the increase in the replacement ratio of RCA, the bearing capacity and stiffness of the special-shaped CFST column decrease, but are better than those of the hollow section columns. As the replacement ratio increases from 0 to 100