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采用壁厚约为16 mm,强度等级为550 MPa的高强钢材,卷板并焊接制作3根圆钢管短柱,高度约为1 m,外直径约为550 mm。在钢管内填充C30强度等级混凝土,用4 000 t压力机对其进行轴心受压试验,并记录受力全过程曲线。运用3种规范的计算公式分别计算其承载力,并与试验结果进行对比。试验发现:3根高强圆钢管混凝土短柱的荷载-位移曲线非常接近,极限承载力约为30 000 k N,公式计算的承载力与试验结果吻合。
Using high-strength steel with a wall thickness of about 16 mm and an intensity level of 550 MPa, three steel bar stubs were coiled and welded to a height of about 1 m and an outer diameter of about 550 mm. C30 strength grade concrete was filled in the steel pipe, and subjected to axial compression test with a 4 000 t press, and the whole process curve of the force was recorded. The calculation formulas of three kinds of codes are respectively used to calculate the bearing capacity and compare with the test results. It is found that the load-displacement curves of three concrete-filled steel tubular short columns are very close to each other, and the ultimate bearing capacity is about 30 000 kN. The bearing capacity calculated by the formula is consistent with the experimental results.