Fatigue Damage Characteristics of Rib-to-diaphragm Joints in Orthotropic Steel Deck

PENG Xi, ZHOU Xu-hong, DI Jin, QIN Feng-jiang, WANG Jie

China Journal of Highway and Transport ›› 2018, Vol. 31 ›› Issue (11) : 78-90.

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China Journal of Highway and Transport ›› 2018, Vol. 31 ›› Issue (11) : 78-90.

Fatigue Damage Characteristics of Rib-to-diaphragm Joints in Orthotropic Steel Deck

  • PENG Xi1, ZHOU Xu-hong1,2,3, DI Jin2,3, QIN Feng-jiang2,3, WANG Jie2,3
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Abstract

Longitudinal rib-to-diaphragm joints are the key structural detail that controls the durability of orthotropic steel deck. Fatigue cracks easily occur in this joint because of complex stress transfer and improper structural design. For conventional rib-to-diaphragm joints during the period of service, fatigue cracks may occur in the cut-outs of the diaphragm, in the diaphragm web at the weld toe, or in the longitudinal rib at the weld toe, including horizontal cracks and vertical cracks. Considering the deficiency of conventional connections, two new configurations are proposed in the design:internal rib joints and seamless joints. Four details of possible cracks in the rib-to-diaphragm joints are interpreted as objects. The finite element method was used to analyze the influence of the moving wheel load on the local stresses of four details, and the fatigue damage characteristics of conventional, internal rib, and seamless joints were studied. The analysis results demonstrate that the local effects of the four details in the rib-to-diaphragm joints are significant under wheel loading. The longitudinal influence area of the wheel load is approximately two diaphragm distances, and the laterally influenced area is approximately two longitudinal ribs. When the transverse distribution of wheelmark is considered, the transverse reduction coefficients of equivalent stress range between 0.94 and 0.97. For the conventional joints, the largest stress range is in the cut-outs detail, which is mainly controlled by the in-plane deformation; the second largest stress range is in the horizontal detail on the longitudinal rib wall, which is mainly controlled by the out-plane deformation. For the inner rib joints, the maximum stress range of horizontal detail and vertical detail on the longitudinal rib wall are reduced by 28% and 29%, respectively, compared with the conventional one, which reduces the stress concentration of the longitudinal rib at the end of the weld. The stress state of each detail of the seamless joint is obviously different from that of other joint types with cut-outs on the diaphragm and is mainly in the compression state. The fatigue failure modes of seamless joints are reduced to two types:cracking at the weld toe in the diaphragm and cracking at the weld toe in the longitudinal rib. Findings conclude that the two details are mainly in the state of compression. The fatigue life of the conventional joints is estimated to be 41.2 years, and the fatigue failure is more likely to be horizontal crack on the longitudinal rib wall. The fatigue life of the inner rib joints is controlled by the cut-outs detail H3 of the diaphragm, which is 58% higher than that of the conventional joints. The fatigue life of the seamless joints is estimated to be 85.3 years, which is 107% and 31% higher than that of the conventional and inner rib joints, respectively. Because the fatigue life of each detail of the seamless joint is similar, using them is more reasonable from the perspective of life-cycle design.

Key words

bridge engineering / orthotropic steel deck / FEM / longitudinal rib / diaphragm / stress influence surface / fatigue life

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PENG Xi, ZHOU Xu-hong, DI Jin, QIN Feng-jiang, WANG Jie. Fatigue Damage Characteristics of Rib-to-diaphragm Joints in Orthotropic Steel Deck[J]. China Journal of Highway and Transport, 2018, 31(11): 78-90

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