EXPERIMENTAL STUDY ON LOAD SHARING OF BOX-SECTION MEMBERS REINFORCED BY PATCH PLATE USING HIGH-STRENGTH STUD BOLTS

Abstract

As a reinforcement method for steel bridges, the patch plate reinforcement using high-strength stud bolts has been developed. However, the method of determining the number of bolts and patch plate thickness has not been clarified, and the rational design method of the patch plate reinforcement has not been established. In this study, the tensile loading tests were conducted on box-section specimens reinforced with patch plates. As a result, by adding more stud bolts, the relative displacement between the main plate and the patch plate was restrained, and the load-sharing ratio of the main plate increased, approaching the cross-sectional area ratio. Increasing the thickness of the patch plate increases the relative displacement, and the load-sharing ratio of the main plate became larger than the cross-sectional area ratio.