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Based on the previous study of the lightweight aggregate concrete filled steel tube (LACFST) slender columns, LACFST specimens with larger slenderness ratio from 64 to 96 were tested. According to the test results, the stability behavior was studied and its influence factors were analyzed. The bound slenderness ratio value was judged and the calculation method was studied. The test results demonstrated that LACFST slender columns under axial compression were damaged instability, and the value of bearing capacity and stability factor decrease as the slenderness ratio increases. Based on the test results analysis, the bound slenderness ratio of LACFST is 80 in this test. A method based on the Euler formula to calculate bound slenderness ratio is provided, and the calculation results are consistent with test ones. By comparison, it is found that the bound slenderness ratio of LACFST is smaller than that of normal CFST. The calculation results using Euler formula indicates that the bearing capacity can be calculated using Euler formula when the LACFST slender columns slenderness ratio is larger than the bound value.

STABILITY BEHAVIOR OF LIGHTWEIGHT AGGREGATE CONCRETE FILLED STEEL TUBULAR COLUMNS UNDER AXIAL COMPRESSION