To study failure modes and seismic behavior of frame joints between steel reinforced concrete special column and steel beam, 4 joints with T-shaped section and 4 joints with L-shaped section were tested under reversed cyclic loading. The parameters of concrete strength, axial compression ratio, core area stirrup ratio were taken into account. The deformation characteristics and the failure mode were investigated, hysteretic characteristics, skeleton curves, bearing capacity, shear deformation of core zone, ductility and energy dissipation ability were analyzed. The result indicates that the failure mode contained shear diagonal compression failure and core zone welding crack failure, the failure mode was determined by axial compression ratio; the specimen possesses plump hysteresis loop, which shows good seismic performance under reversed cyclic loading. With the increase of axial column load, the joints capacity increased, and the displacement ductility decreased as axial load ratio increased. The ultimate strength, ductility and energy dissipation capacity can be enhanced by increasing the stirrup ratio of core area.
Key words
steel reinforced concrete /
frame joints /
quasi-static test /
seismic behavior
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References
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