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In recent years, durable highway bridge composite decks such as steel and concrete or FRP and concrete composites have been encouraged to construct in Japan. In this study, the steel and concrete composite deck arranged channel shape steel members in the transverse direction on the top surface of the bottom steel plate has been investigated by the authors. By the arrangement of channel shape steel members welded on the bottom steel plate, the steel and concrete composite deck with hollows inside the channels in concrete becomes to be more lightweight than typical steel and concrete composite decks. For highway bridge decks, it is significantly important to verify the fatigue strength of welded joints as well as headed studs. In this paper, fatigue tests on the welded joint between the channel shape steel and the steel plate were carried out under the tensile cyclic stress. Both stress concentration factors at the weld root and toe of the fillet welded joint conducted herein were approximately same values. A fatigue crack initiated from the weld root of fillet welded joint and propagated into the steel plate due to the existing of a small void at the weld root. Finally, the stress range versus fatigue life diagram (S-N curve) was obtained and the fatigue strength was compared with the Fatigue Design Recommendations specified in Japanese Society of Steel Construction (JSSC). The results showed that the fatigue strength of the welded joint studied in this study was appropriate to the C grade of the Fatigue Design Recommendations.

Fatigue Strength of Welded Joint between Channel Shape Steel and Steel Plate