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In this paper, the effect of several important factors affecting the fatigue characteristics of deformed bars, such as, bar diameter, existence of an arc on the root of lug or not, intersectional angle between the lug direction and the longitudinal direction of bar, and gas pressure welding joint, is estimated quantitatively. Based on this estimation, fatigue strength equation can be presented. This equation predicts measured fatigue strength reasonably accurately. Furthermore considering of application for design, design equation for fatigue strength is proposed.

PROPOSED DESIGN EQUATION FOR FATIGUE STRENGTH OF DEFORMED BARS