Abstract
Some bridge girders are galvanized in a bath of molten zinc at about 450°C after construction by welding in order to reduce the cost of maintenance. During galvanization, there occurs a thermal stress which causes elasto-plastic buckling of the web panel. Tensile strain concentration due to buckling deformation incidentally brings about cracking at the strain-concentrated spot. In the present study, the mechanical behaviours of bridge girders in hot-dip galvanization have been studied by finite element analysis in order to solve the physical mechanism of the strain concentration. Bodner's visco-plastic constitutive modeling based on the dislocation theory, which takes into account the temperature dependence of material properties, has been adopted in the present analysis to conduct numerically stable calculations.
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