A Study on the Applicability of Double Flare-Bevel-Groove Welds to D51 Rebar

Abstract

In this study, we considered the applicability of double flare-bevel-groove welds to D51 rebar. First, to investigate the effect of welding posture, some welding experiments were done. From the result, it was confirmed that reduction of the throat thickness by 1.7 mm is required when calculating weld leg length. Next, to establish the design embedment length of D51 rebar with double flare-bevel-groove welds, tensile test and repeated tensile test were conducted in accordance with applicable Japanese technical guidelines. As a result, it was confirmed that 5 times the rebar diameter suffices as the embedment length of D51. Finally, in double flare-bevel-groove welds, eccentric bending moment is caused by the difference in the centroid position between the rebar and steel plate, so we proposed a method for calculating the required steel plate thickness to prevent steel plate yielding over the service period.