Seismic Tests on Square Thin-Walled Steel Tubular Columns Filled with Demolished Concrete Lumps

This paper presents a most recent experimental work for evaluating the seismic behaviors of square thin-walled steel tubular columns filled with demolished concrete lumps (DCLs). Fifteen specimens with 300 x 300 mm square section, including 10 columns filled with DCLs and 5 reference columns without DCLs, were tested under combined axial compression and lateral cyclic loading. The parameters considered in the tests are: replacement ratio of DCLs, thickness of steel tube, and axial load ratio. Research findings indicate that the seismic performances of square thin-walled steel tubular columns filled with DCLs are similar to the benchmark columns without DCLs, and the square thin-walled steel tubular columns filled with DCLs also exhibit acceptable ductilities and energy dissipation abilities.