Member capacity of thin-walled I-sections in combined compression and major axis bending

This paper describes a series of tests performed on I-sections fabricated from slender high strength steel plates by welding. The objective of the program was to determine the member capacities for specimens of two different lengths when subjected to compression and major axis bending. The tests were conducted in a purpose-built test rig capable of applying axial load and moment in a constant ratio. The tests were performed using different axial load to moment ratios, as well as pure axial load and pure moment, hence allowing the moment-axial force interaction curve to be constructed. Detailed measurements of residual stresses, material properties and geometric imperfections, as well as stub column tests were performed prior to the tests. The test results are compared with rules of the Australian Steel Structures Standard AS4100 [1] , Amendment No.2 to AS4100 Steel Structures [2] , the American Institute of Steel Construction Load and Resistance Factor Design Specification [3] , and Eurocode 3: Part 1.1 [4] .