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In order to study the influence of web holes on axial compression behaviors of thin-walled columns with different section forms, a total of 10 pin-ended compression specimens with two section forms were tested. One section is channels with complex edge stiffeners and web holes, the other section is channels with complex edge stiffeners and Σ type web stiffeners and web holes. The ultimate load, buckling mode and deformation behavior of these specimens were studied. It was found that the axial compression loading efficiency of perforated Σ-section specimens can increase about 30% to 50%, which compared with channels with complex edge stiffeners and web holes under the same conditions. The tests were simulated by finite element analysis (FEA), and the analysis results agreed well with experimental data. It was shown that the loading efficiency of Σ-section models with holes decreased about 25% compared with the same section models without holes. While channel section models with complex edge stiffeners and holes decreased about 6% average. Furthermore, the direct strength method (DSM) was used to calculate the ultimate loading capacity of perforated channels with complex edge stiffeners. The results indicate that the existing DSM formulas for perforated members, developed mainly based on channel sections with simple edge stiffeners, are also valid for channels with complex edge stiffeners and web holes under axial compression.

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