Structural design of cold worked austenitic stainless steel
When stainless steel is cold worked, it undergoes substantial strain hardening, leading to significant strength enhancement. This strength enhancement has not generally been utilised in practice due to a lack of knowledge of the structural behaviour of this material. This research project carried out extensive experimental and numerical studies on material specimens, structural members and connections in order to generate data on the key aspects of the structural design of cold worked stainless steel. From the results of these investigations, design rules were developed which facilitate the... economic structural design of members made from cold worked stainless steel. The work packages studied the following: various grades of stainless steel cold worked to different levels, subject to uniaxial and biaxial tests; rectangular hollow sections, trapezoidal sheeting, C and Z sections, subject to axial load and bending; welded and screwed connections subject to tensile loads; fatigue of welded joints; fire tests on material specimens, beams and columns; fatigue tests on bars and the welded connection between bars and plates. Generally the design guidance in the Eurocode for annealed stainless steel can be applied safely to cold worked stainless steel of strength classes C700 and C850. In certain instances, less conservative guidance is applicable. A significant development in this project was the validation of guidance on the design of welded joints in cold worked material. A modified simplified calculation model for fire resistant design was developed.