Design Tool for the Ultimate Bending Resistance of Steel-Concrete Compos ite Bridge Girders with Flat and Corru gated Web Plates made of Stainless Steel
Examensarbete för masterexamen
Structural engineering and building technology (MPSEB), MSc
Stainless steel may be a relatively expensive material choice, however, its remarkable and sustainable material properties can make it a great option for steel-concrete composite beams in bridge construction. Stainless steel provides a ductile behaviour with substantial strain hardening, and if combined with a corrugated web, the plastic capacity can be utilized even further. Eurocode only provides an analytical calculation method for carbon steel beams with an elastic perfectly plastic calculation model, furthermore, corrugated webs are completely disregarded in bending. For a beam with stainless steel and a corrugated web, this provided method is especially conservative. The aim of this master’s thesis was to develop a design tool capable of calculating the ultimate bending capacity for beams with different materials and geometry, also, incorporating behaviour models from recent research of corrugated beams and stainless steel. The tool was tested for stability with shifting location of the neutral axis and the bending capacity was verified with a comparison to finite element analysis in a case study. The resulting comparisons between the design tool and finite element analysis suggest that the tool preforms satisfactory with bending moment capacities closer to the simulations compared to the conservative Eurocode models. This imply that the elastic perfectly plastic calculation model is not recommended for beams with stainless steel and high levels of strain hardening. Even though the design tool is stable and yield good results, parts of it still needs additional validation and development. More research in this topic is needed in order to get a better understanding of the actual behaviour of this type of beams. At the moment the available research is limited, especially for steel-concrete composite beams with corrugated webs.
Steel-concrete composite beam, Stainless steel, Strain hardening, Corru gated web, Ultimate bending capacity, Design tool