Abstract
It is well known that residual deformation is retained in hot dip zinc galvanized steel structural members. This deformation is mainly caused by thermal deformation which occurs when the members are dipped into molten zinc. Therefore, in order to consider the countermeasure for the occurence of such residual deformation, it is very important to investigate the thermal deformation and thermal stress caused by dipping. However there are very few reports on these kinds of transient deformation and stress.In this study, the cross-sectional deformation and the thermal strain of a steel pipe (φ660.4× 18, L=3500mm) were measured on the specimens dipped into 460°C molten zinc from 20°C by using displacement transducers and capsule type high-temperature strain gages, respectively. They were also analyzed by using the finite element method (FEM) and the results were compared with those of the experiments.The main results obtained are as follows:(1) The measured variations of deformation and thermal stress for a steel pipe dipped into molten zinc coincided well the results analyzed by using FEM in sequence.(2) The total deformation and the thermal stress of the steel pipe varied with the dipping speed: the thermal deformation as well as the thermal stress decreased with increasing dipping speed.
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