An　experimental　investigation　and　analysis　of　the　mechanical　behavior　of　steel　reinforced　concrete　(SRC)　columns　under　combined　bending-torsion　cyclic　loads　is　presented　in　this　paper.　Seven　SRC　columns　with　the　same　cross-sectional　construction　were　tested　under　various　torsion　moment　to　bending　moment　ratios　and　axial　load　levels.　The　effect　of　the　torsion　to　bending　moment　ratio　on　the　failure　characteristics,　hysteretic　behavior,　bearing　capacity,　and　deformation　characteristics　of　the　SRC　columns　was　studied.　Results　indicate　that　both　bending　and　torsion　bearing　capacity　are　reduced　under　combined　bending　and　torsion　loads　and　that　the　torsion-bending　ratio　is　the　key　parameter　that　determines　the　failure　mode　of　the　SRC　columns.　Based　on　the　tests　results,　an　equation　expressing　the　interaction　curve　between　the　bending　and　torsion　is　proposed.