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Abstract

Twelve specimens of simply supported composite steel-concrete beams were analyzed to scrutinize the failure of local buckling; these specimens were loaded by the combined effect of axial compression and negative bending. Models of a three-dimensional nonlinear finite element were simulated by using ANSYS 12.1 program to estimate the ultimate loads. To investigate the adequacy of these models, a comparison was made between the gained results with past experimental work. A suitable agreement was obtained between the outcomes, in which the extreme gap for the ultimate loads is found to be approximately 8.2%. In the meantime, local buckling failure was noticed in the compression parts of the whole proposed samples, the fail begins at the web of the steel section and then propagated to the flange. On the other hand, when the concrete slab thickness increased by 20 %, the capacity of vertical load will increase by 17.8 %, while the axial load capacity increases by 5.4 %, and if the slab thickness increased by 40 %, the vertical load capacity will be 35.5 %, and the axial load increases by 10.3%.