An experimental investigation is undertaken in order to study the behaviour of AA 6082 alloy aluminium columns at elevated temperatures. Particular emphasis is put on high temperature creep effects. Tensile tests provide information for the material model of aluminium applied in the nonlinear finite element programs. 31 column buckling tests are performed for validation of the material models in nonlinear finite element programs and for evaluation of design rules. The column buckling tests are compared to numerical analyses and design rules predictions.
The cost and weight benefits that may be achieved by utilizing aluminium alloys in offshore structures are becoming well known. Some of the latest examples are the living quarters of the Visund, Oseberg Ost and Troll C platforms in the North Sea. Oseberg SOr, which is under construction will also be provided with living quarters built in aluminium. The aluminium alloy AA 6082 is frequently used. The choice of this alloy is based on a combination of high strength and good resistance to corrosion, in addition to the availability of different forms, e. g. extruded profiles and plates. Accidental fires are events with severe catastrophe potential, in particular for aluminium structures, due to the rapid strength degradation of aluminium at elevated temperatures. Personnel must be able to reach the rescue areas and remain safe there until evacuation is performed. This requires that the structure can not collapse before evacuation is carried out. Reliable fire response prediction models are essential for the design and fire safety assessment. Experimental tests are needed to evaluate material models for aluminium under elevated temperatures. When design rules are evaluated in this work, the focus is set on the capacity of columns subjected to axial compression, bending and temperature load / fire. Capacity both at ambient temperature and elevated temperatures are checked.
