Experimental study on axial compression behavior of multi cavity T-shaped concrete-filled steel tubular columns
In order to study the axial compression behavior of multi cavity T-shaped concrete-filled steel tubular columns,the axial compression tests of 7 multi cavity T-shaped concrete-filled steel tubular columns and 2 ordinary T-shaped concrete-filled steel tubular columns were carried out,and effects of steel tube wall thickness,concrete strength and height-width ratio on the axial compression behavior of multi cavity T-shaped concrete-filled steel tubular columns were mainly investigated.The test results show that the multi cavity T-shaped concrete-filled steel tubular columns provide higher axial compression bearing capacity and better deformation performance than the ordinary T-shaped concrete-filled steel tubular columns under the same conditions.The axial compression ultimate bearing capacity of multi cavity T-shaped concrete-filled steel tubular columns increase significantly with the increase of the steel tube wall thickness,and decreases with the increase of the height-width ratio.When high-strength concrete is used,the thicker steel tube shall be matched to give full play to the properties of the two materials.The axial compression ultimate bearing capacity of the American code ANSI/AISC 360-16,the European code Eurocode 4,the Japanese code AIJ-CFT and the Chinese code GB 50936-2014 was calculated and compared with the test results.The results show that the Eurocode 4 formula has the highest calculation accuracy and the smallest discreteness.
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