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概要

In terms of maintenance, repair and reinforcement of existing welded steel structures, it is required to evaluate the fatigue strength of welded joints and structural members with weld defects. Fatigue design guidelines specify that the fatigue strength of welded joints should be confirmed by fatigue tests reflecting the actual situation. However, it is difficult to carry out such fatigue tests in most instances. This paper proposes that the simple method to evaluate the fatigue strength of welded joints and structural members with weld defects and fatigue cracks, using the ratio between the stress intensity factor in the stress-strain field with a micro-crack of the joint that the fatigue strength is already known and that of the joint that fatigue strength is unknown, and the validity of this method is verified.

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