Abstract:Based on the pseudo-static test of 8 small span-depth ratio steel truss coupling beams, the composite coupling beams' failure characteristics, shear-bearing capacity, deformation capacity, hysteretic curve, Skeleton, ductility, energy dissipation, rigidity decline and reasonable truss style are analyzed. The test results show that: The steel beams with cross abdominal trusses have bigger shear-bearing capacity and better ductility and energy dissipation capability than those beams without cross abdominal trusses. A better bearing capacity can be obtained when span-depth ratio is smaller and stiffness is bigger .The two design methods of the beams’ ends, pre-buried steel plates and buried steel chord members in concrete, are available and easier to construct than reinforced coupling beams . The steel truss coupling beams have fairly good mechanisms and seismic behavior.