Traction structural stress analysis of fatigue behaviors of rib-to-deck joints in orthotropic bridge deck

Wang, Ping; Pei, Xianjun; Song, Shaopin

doi:10.1016/j.ijfatigue.2019.03.038

Cited by 80 publications

(43 citation statements)

References 33 publications

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“…The traction structural stress method is proven to be more accurate and effective in predicting the fatigue life when compared to traditional prediction methods. The accuracy of the finite element simulation method using traction structural stress has also been validated [20,21] based on the comparison of fatigue test data. The traction structural stress method is proven to be more accurate and effective in predicting the fatigue life when compared to traditional prediction methods.…”

Section: Validation Of the Numerical Methodsmentioning

confidence: 99%

Fatigue Performance of Different Rib-To-Deck Connections Using Traction Structural Stress Method

et al. 2020

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The fatigue performance of an orthotropic steel bridge deck is significantly influenced by the type of the rib-to-deck connection considering the crossbeam. Fatigue fracture of the weld seam at the rib-to-deck connection has been a serious problem in such decks. In this paper, numerical models are developed for the orthotropic steel bridge decks and are analyzed for the fatigue behavior. The traction structural stress method is proven to be more accurate and effective in predicting the fatigue life. Fatigue behavior of three typical rib-to-deck connections are obtained by using traction structural stress method and by considering the effect of crossbeams. Compared to the bridge deck with weld seam of a large root, the fatigue performance of the deck with single-sided weld seam is much better with lower equivalent structural stress. The results indicate that the weld seam size should be strictly controlled for better fatigue resistance. The fatigue performance of the bridge deck with double-sided seam is significantly better than that of the bridge deck with single-sided weld seam. An increase in the thickness of the inner weld seam in the rib-to-deck connection optimizes the distribution of the equivalent structural stress and shifts the fatigue failure location from the weld root of the outer weld seam to the weld toe of the inner weld seam thus demonstrating the effect of the crossbeam. The trends of equivalent structural stress with geometric parameters of the weld seam in the rib-to-deck connection are obtained in this study. The fatigue behavior of the components and the equivalent structural stress are significantly influenced by the bridge deck thickness.

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Section: Validation Of the Numerical Methodsmentioning

confidence: 99%

Fatigue Performance of Different Rib-To-Deck Connections Using Traction Structural Stress Method

et al. 2020

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“…The studies on the fatigue behaviors of rib-to-deck welded joints in orthotropic steel decks using equivalent structural stress have been given by Li et al [20] and Wang et al [21]. However, these research efforts on the fatigue performance of rib-to-deck welded joints in OSDs occurred under experimental conditions.…”

Section: Appl Sci 2019 9 X For Peer Review 2 Of 25mentioning

confidence: 99%

Influence of Weld Parameters on the Fatigue Life of Deck-Rib Welding Details in Orthotropic Steel Decks Based on the Improved Stress Integration Approach

et al. 2019

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Fatigue cracks in orthotropic steel decks (OSDs) have been a serious problem of steel bridges for a long time. The structural stress approach is an important approach for fatigue life evaluation of welded structures. Firstly, two parameters and the mesh sensitivity of the stress-based integration equivalent structural stress approach (stress integration approach for short) are analyzed in this paper. Then, the applicability of the master S-N curve is verified based on experimental data of the deck-rib welding details in OSDs. Finally, the multi-scale finite element model (FEM) of Jiangyin Bridge is established, and the bridge fatigue life calculation steps based on the stress integration approach are given. The influence of the slope of the master S-N curve at high cycles on the bridge fatigue life is discussed. Further, the weld parameter influences on the bridge fatigue life are analyzed, as including the following: (1) The determination of the influence of the weld size changes caused by weld manufacturing errors on the bridge fatigue life; (2) the proposal of a new grinding treatment type, and the analysis of influence of the grinding radius on fatigue life; and (3) a comparison of the fatigue life of the deck-rib welding details under 80% partial penetration and 100% full penetration. The results show that the structural stress calculated by the stress integration approach does not change significantly with the parameters of the isolation body width w and the distance δ between the crack propagation surface and the reference surface. To simplify the calculation, δ is set as 0, and w can be set as the mesh size along the weld length direction. The mesh size of the stress integration approach is recommended as 0.25 times the deck thickness. The slope of the master S-N curve at high cycles significantly affects the bridge fatigue life, and a slope of 5 is reasonable. The weld parameter studies for the deck-rib welding details in the OSD of Jiangyin Bridge show that the change of weld size caused by manufacturing errors can obviously affect the bridge fatigue life, and the fatigue life of five different weld types varies from 51 years to 113 years. The new grinding treatment type, without weakening the deck, is beneficial to improving the bridge fatigue life. The fatigue life increases by approximately 5% with an increase of the grinding radius of 2 mm. The fatigue life of 80% partial penetration is slightly higher than that of 100% full penetration.

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“…It is worth noting that the fatigue resistance of the SW models is dominated by the root‐to‐deck failure mode, while the fatigue resistance of the SU models can be dominated by the toe‐to‐deck or root‐to‐throat failure modes. Some investigations attempted to quantify the weld geometrical effect on fatigue failure modes of the SU models and concluded that the root‐to‐throat failure mode most likely happens at the lower penetration rates . However, those studies only focused on the test specimens with rib loadings.…”

Section: Introductionmentioning

confidence: 99%

Rib loading effects on weld root fatigue failure modes at rib‐to‐deck welded joint

Luo

Zhang

Bao

2020

Fatigue Fract Eng Mat Struct

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The service life of orthotropic steel decks is dependent on the fatigue resistance of rib-to-deck welded joints, which is often tested using two kinds of experimental models in terms of the rib loading condition. Different weld root fatigue failure modes have been observed in the different models, but the role of rib loading remains unclear. This paper aims to clarify the effect of rib loadings on the weld root fatigue failure modes at rib-to-deck welded joints. The loadings are decomposed into the deck loadings and rib loadings according to the principle of superposition. Formulae of the weld root notch stress intensity factors and T-stress under rib loadings are developed by multiparameter regression analysis and subsequently used for the local stress analysis. The fatigue failure modes determined from the local stress field agree well with the experimental results. The results reveal that the weld root failure modes depend on the rib loadings but are independent of the weld geometries. The averaged strain energy density (SED) that can capture both weld geometry and loading condition effects is used to correlate the fatigue test data of different weld root failure modes. The SED is capable of evaluating the fatigue strength of the rib-to-deck welded joint failed by different weld root failure modes with a narrow scatter band. K E Y W O R D Sfatigue failure mode, fatigue test model, local stress field, notch stress intensity factor, weld geometry

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Traction structural stress analysis of fatigue behaviors of rib-to-deck joints in orthotropic bridge deck

Cited by 80 publications

References 33 publications

Fatigue Performance of Different Rib-To-Deck Connections Using Traction Structural Stress Method

Fatigue Performance of Different Rib-To-Deck Connections Using Traction Structural Stress Method

Influence of Weld Parameters on the Fatigue Life of Deck-Rib Welding Details in Orthotropic Steel Decks Based on the Improved Stress Integration Approach

Rib loading effects on weld root fatigue failure modes at rib‐to‐deck welded joint

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