Fatigue Resistance Evaluation for Structural System of Orthotropic Steel Bridge Deck Based on Equivalent Structural Stress

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China Journal of Highway and Transport ›› 2018, Vol. 31 ›› Issue (12) : 134-143.

LI Jun, ZHANG Qing-hua, YUAN Dao-yun, GUO Ya-wen, BU Yi-zhi

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The fatigue problem of orthotropic steel bridge decks (OSDs) is a fatigue problem of a structural system with multiple fatigue failure patterns. To study the fatigue failure patterns and fatigue resistance for structural systems of OSDs, an evaluation method for fatigue resistance of the structural system was proposed by determining the dominant fatigue failure pattern. Based on the important fatigue failure patterns of OSDs, a total of eight full-scale specimens were designed and tested to determine the important fatigue failure patterns and fatigue resistances of rib-to-deck welded joints and longitudinal rib-to-diaphragm welded joints. The effects of upsetting edge rib and double-sided weld of rib-to-deck welded joints on the fatigue resistances of OSDs were discussed along with evaluation method of the structural system. The results indicate that the dominant fatigue failure pattern of the rib-to-deck welded joints of normal and upsetting edge ribs are root-to-deck cracks; the dominant fatigue failure pattern of the rib-to-diaphragm welded joints is the fatigue crack initiated from the toe and propagated along the longitudinal rib. The fatigue resistances of important failure patterns are reduced owing to the initial manufacturing defects, and the dominant fatigue failure patterns are thus transferred. For the dominant fatigue failure pattern of an OSD, the fatigue resistance of a structural system cannot be significantly improved by introducing the upsetting edge rib. The dominant fatigue failure pattern of an OSD will thus be transferred to the toe-to-deck or longitudinal rib-to-diaphragm welded joints through the double-sided welds, and the fatigue resistance of the OSD improves.

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bridge engineering / orthotropic steel deck / fatigue resistance of structure system / dominant fatigue failure pattern / double-sided weld

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LI Jun, ZHANG Qing-hua, YUAN Dao-yun, GUO Ya-wen, BU Yi-zhi. Fatigue Resistance Evaluation for Structural System of Orthotropic Steel Bridge Deck Based on Equivalent Structural Stress[J]. China Journal of Highway and Transport, 2018, 31(12): 134-143

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Received	Published
2018-03-21	2018-12-20
Issue Date
2019-01-07

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