Abstract
Modified interaction equations have already been proposed for the ultimate strength design of square hollow structural section columns subject to biaxial bending. The Canadian Standard S16.1-1974 permits the use of these equations for class 1 and class 2 square hollow structural section beam columns. Results of a test programme undertaken to verify experimentally the validity of these equations are presented in this paper. Tests were conducted under various combinations of axial compression and biaxial bending moment. From the test results it is concluded that the proposed interaction equations give a safe and satisfactory strength criterion for the limit states design of class 1 and class 2 square hollow structural section beam columns.
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