Axial compressive performance of concrete filled double-skin high-strength steel tubular short columns after whole process fire
In order to study the fire resistance of concrete filled double-skin high-strength steel tubular short col-umns(CFDST)after fire in the whole process of rising and cooling,the temperature field model and thermodynamic analysis model of concrete filled double-skin high-strength steel tubular short columns were established by using the finite element software ABAQUS after determining the constitutive models of the high strength steel and con-strained concrete at different stages.And the model is verified by the existing experimental data.The effects of heat-ing time,hollow rate,material strength and axial compression ratio on the residual bearing capacity of short columns were analyzed.The results show that with the increase of heating time,the residual bearing capacity of concrete filled double-skin high-strength steel tubular short columns decreases significantly after the whole process fire;With the increase of hollow ratio,the residual bearing capacity coefficient of short columns first increases and then decreases,and the short column with hollow ratio of 0.52 has the best fire resistance;Material strength and axial compression ratio have little effect on the residual bearing capacity coefficient of short columns,and the residual bearing capacity increases with the increase of material strength.
after the whole process of fireconcrete filled double-skin high-strength steel tubular short columnaxial pressure performanceresidual bearing capacity
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