Research on Manufacturing Process and Fatigue Performance of the Rib-to-Deck Both-sided Full Penetration Welded Joints in OSDs
Fatigue cracking of the rib-to-deck welded joint in orthotropic steel bridge deck(OSD)is prominent,which severely affect the service quality of bridge projects.To improve the fatigue performance of rib-to-deck welded joints,advanced internal welding technology is used to develop both-sided full penetration welding joints of rib-to-deck welded joints.The reasonable welding process parameters and welding joint quality are studied through process tests.The fatigue performance of both-sided full penetration welding details is studied from two aspects:structural details and initial micro-cracks.The research results indicate that adopting both-sided submerged arc welding process can effectively ensure the quality of weld formation of full penetration high-quality rib-to-deck welded joint,and the weld performance meets the design requirements.The reasonable welding parameters of different manufacturing processes are determined.From the perspective of structural details,compared with single sided welding,the equivalent structural stress amplitude of the dominant crack mode in both-sided full penetration welding is reduced by 10％.Regarding the initial micro-crack,the initial micro-crack size has a significant impact on fatigue life.From the comprehensive analysis of the above two aspects,the fatigue life of both-sided full penetration is about twice of that for single-sided welding.
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