Restoring force model of composite joints of concrete-filled double-skin steel tubular column to steel beam with reinforced concrete slab
The RC slab has a great influence on the bearing capacity,failure mode and hysteretic behavior of composite joints because of the changes of the beam-column stiffness ratio.However,the existing restoring force models do not consider the effect of the initial stiffness of RC slabs.Therefore,based on the quasi-static test of composite joint of concrete-filled double-skin steel tubular(CFDST)column to steel beam with RC slab,the characteristics of skeleton curves for the specimens were investigated in this study.A three-fold skeleton curve model of the composite joint specimens was proposed according to the skeleton curves of the specimen.Considering the effect of RC slab on the initial stiffness of composite joint,the restoring force model of composite joint was derived and established according to the stiffness degradation and hysteresis rules,which was verified by the experimental data.The results show that the RC slab has a significant effect on the initial stiffness of joints and improves the ultimate load of joints.The restoring force model in this study can accurately reflect the hysteretic characteristics of the type of composite joint.
concrete-filled double-skin steel tubular(CFDST)columncomposite jointeffect of RC slabinitial stiffnessrestoring force model
万方数据
维普
