Abstract
In this paper, the structures of 11 steel welded bridges in Poland are shown. These bridges were constructed between 1929 and 1939. In 7 of those bridges, 15 routine photographic X-ray tests of the butt joints were made. From 136 X-ray pictures, the bad condition of the butt welds and the occurrence of internal cracks in the welds were found. To estimate the future safe usage period of the bridges, examinations of the fatigue strength of the welded butt joints of a similar structure were performed and a stress analysis carried out on them.
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