Experimental study on axial compression mechanical properties of concrete-filled steel tube column after impact
Seven concrete-filled steel tube columns were designed and manufactured,and the axial compression test of concrete-filled steel tube columns after drop hammer impact test was carried out.The effects of axial compression ratio,thickness of the steel tube and impact energy on the axial compression mechanical properties of concrete-filled steel tube columns under impact were studied.The calculation formula of bearing capacity of concrete-filled steel tube columns after impact was proposed.The results show that when the axial compression ratio increases from 0 to 0.2,the bearing capacity and displacement ductility coefficient of concrete-filled steel tube column increase with the increase of axial compression ratio,which increases by 20.05%and 15.66%respectively.When the axial compression ratio increases from 0.2 to 0.4,the bearing capacity and displacement ductility coefficient of concrete-filled steel tube columns begin to decrease,which are reduced by 3.56%and 5.21%respectively.The initial stiffness coefficient increases with the increase of axial compression ratio.The thickness of the steel tube can improve the mechanical properties of the concrete-filled steel tube column.The bearing capacity,displacement ductility coefficient and initial stiffness coefficient of the concrete-filled steel tube column with a thickness of 7mm are 35.46%,22.89%and 7.84%higher than those of the concrete-filled steel tube column with a thickness of 5mm,respectively.With the increase of impact energy,the axial compression mechanical properties of concrete-filled steel tube columns decrease.
concrete-filled steel tube columnthickness of the steel tubeimpact energyaxial compression ratiomechanical property
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