Manuscript received February 8, 2023; revised April 17, 2023; accepted July 30, 2023.
Abstract—Angle steel columns with connection joints are prevalent in tower structures, and their stability bearing capacity directly determines the safety of the towers. The bearing capacity and structural performances of Q355 equal-leg angle steel columns with Single-Clad End Connection joints (SCEC) were analyzed based on axially loaded experiments and numerical simulations. Experimental setup and procedures have been described in detail. Typical test results of 30 columns were reported and analyzed, including failure modes, load-axial deformation curves, load-lateral displacement curves, and load-strain curves. Combined with the results of the test and the finite element analysis, it was found that the local buckling mode dominates in the angle columns with SCEC when λ < 120 (herein λ is the slenderness ratio), while the flexural buckling mode dominates when λ ≥ 120. The overlap area ratio is recommended to be not less than 1.1. The length of connection joints has a positive correlation to the bearing capacity of the short columns with SCEC. The bearing capacity of stockier columns with SCEC is lower than that of the single angle columns to varying degrees, the slenderer ones is slightly higher than that of the single angle columns. With the slenderness ratio continuing to increase, the bearing capacity of angle columns with SCEC is getting closer to that of single angle columns. The predictions of relevant design codes are excessively conservative in the moderate-to-high λ range, while the result was the opposite for the specimens with a smaller λ.
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