Comparison was made in terms of ultimate resistance between predicted results (Pp) and experimental results (Pt)
of 65 specimens from Han [4], Cai [9], Huang [11], Chen [6], Yang [17], and Yang in this paper, displayed in Fig. 19.
The cross-sectional depth b ranges from 130 mm to 300 mm; the thickness of steel tube t from 1.25 mm to 12 mm; the depth-to-thickness ratio b/t from 37.5 to 240; the steel strength (fy) from 162 N/mm2 to 382 N/mm2 the concrete strength (fck) from 23.94 N/mm2 to 54.8 N/mm2.
The mean value and standard deviation of the ratio of predicted ultimate resistance to test result are respectively 0.999 and 0.08, which illustrates that numerical predicted results have a good agreement with the test results.