Here, to improve aseismic performance of RC column-steel beam (RCS) joints, a box type RCS joint was proposed based on the column through type RCS joint. Based on low cycle repeated loading tests of 4 RCS box type joints, their failure characteristics, load-bearing characteristics and aseismic performance were studied. Effects of reinforcement of additional cover plate at the beam end, inner web spacing and thickness on failure mode, hysteretic energy dissipation characteristics and deformation of the joints were analyzed. The results showed that failure of joint specimens is concentrated in column end and beam end, and joint zone has no failure to meet the design requirement of “strong joint and weak member”; when specimens are damaged, their ductility coefficients are larger than 3.0, and their equivalent viscous damping coefficient are within the range of 0.16-0.27 to have good aseismic performance; joints’ shear forces are mainly exerted on inner web, while outer side plate mainly acts as stirrup and is subjected to parts of shear forces; increasing spacing of inner webs can reduce restraint on end plate of steel beam and strains of inner webs, outer side plates, end plate of steel beam and flange of steel beam; cover plate can increase bending stiffness of beam end and strengthen constraint of end plate of steel beam to reduce strain of flange of steel beam, and significantly increase strain of inner webs and end plate of steel beam; thickening inner webs can strengthen restraint of steel beam end plate to significantly increase strain of steel beam flange, slightly increase strain of steel beam end plate, and slightly decrease strain of inner web; designing box type joints should appropriately increase inner web spacing and choose larger plate thickness; the study results can provide a reference for designing RCS box type joints.
Key words
RCS joints /
quasi-static test /
aseismic performance /
shear capacity
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