緑大橋の現場架設における殘留應力について

概要

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On account of the problem of transportation, we were obliged to make the field welding to some parts of the main girders of the Midori Ohashi. In this connection, we studied and investigated the residual stress and strain of tne welded parts before hand according to the welding order making the materials of actual size. As to the parts of web we found that the distribution of residual stress, perpendicular to the welding line, retains the compressive stress in any position. It reached to the stress of over 20kg/(mm)^2 max at the central part of welding line. It is considered that the existance of compressive stress in welding parts other then else was the results of effect by the buckling of web. The longitudinal stress in smaller compared with the transverse stress, became the back-step method is applied. The distribution of stress on the flanges of upper and lower sides were conformed themselves completely, we also noticed that the stress which is nearness to the yielding point of the same material exists in the direction of longitudinal stress. It was less than 5kg/(mm)^2 in the direction of transverse stress.
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