Residual Axial Bearing Capacity of Concrete-Filled Steel Tubular Columns After Lateral Impact
In order to study the residual bearing capacity of concrete-filled steel tubular(CFST)column after lateral impact,the axial compression test of CFST column after impact was carried out,and a finite element analysis model of CFST column after impact under axial compression was built.The existing test data was used to validate the accuracy of the model.The mechanical performance of typical CFST column under axial compression was analyzed.The influence of parameters such as concrete strength grade,impact mass,impact height,steel pipe strength grade,impact position,boundary condition and length-diameter ratio on the residual bearing capacity of CFST column was studied.The results show that the concrete strength grade has little effect on the residual resistance.When the concrete strength increases from C50 to C65,the residual bearing capacity only increases by 1.44％.The residual bearing capacity decreases by 10.64％when the impact mass increases from 330 kg to 630 kg.When the impact height increases from 4 m to 7 m,the residual bearing capacity decreases by 10.15％.Compared with CFST column using Q235 steel,the residual bearing capacity of CFST column with Q420 steel increases by 39.54％.When the impact position is closer to the middle of the span,the residual bearing capacity gets smaller.With the increase of the degree of freedom in the boundary conditions,the residual bearing capacity decreases.Finally,a residual bearing capacity formula of the CFST column after impact is proposed in this paper.
concrete-filled steel tubular(CFST)columnfinite element simulationresidual bearing capacityimpact actionaxial compression test
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