name:Yoshiyasu Nagata
Thesis title¡§¡ÖA study on effect of residual stress in thick plate on load carrying capacity of steel girder bridge¡×
Advising teacher¡§Professor Masatsugu Nagai
Recently, the construction number of steel girder bridge using thick plates has been increasing in Japan. Although it is afraid that residual stress in the thick plates affects the load carrying capacity of the girder, its design method has not been changed due to the lack of measurement data. Therefore, this study aims to measure the distribution of residual stress in the thick plates by mechanical cutting method. Herein, for the measurement in the thickness direction, have proposed a simplified measurement method. As a result, it was found that the slope of stress distribution in the thickness direction becomes large with increasing thickness of the plate. Then, after considering the equilibriums of residual stress, the residual stress in three-dimensional model was introduced into a finite element analysis model, which is the modeling of an existing bridge at the intermediate support. As a result, it was confirmed that residual stress in the thick plate does not affect the load carrying capacity of steel girder in bending so much.
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