A research on a box-section steel-concrete composite coupling beam was carried out.Through finite element simulation and theoretical analysis,the yield mode and seismic performance were thoroughly explored.The yield modes of composite coupling beams with different parameters were compared and analyzed.Based on the relationship between the length of the composite coupling beams and the yield capacity,the criterion of yield mode was given,and the influence of different parameters on the yield mode of the composite coupling beam was studied.The results show that tendency of bending yield is enhanced by reducing the section height,steel web height to thickness ratio,steel yield strength,concrete strength,and increasing the shear span ratio,steel flange width to thickness ratio,section height to width ratio.The ductility of bending yield members is generally better than that of shear yield members under axial compression,while the ductility of shear yield members is better than that of bending yield members under axial tension.The elastic stiffness,yield load,ultimate load and energy dissipation coefficient of shear yield members are generally larger than that of bending yield members.
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