Fatigue reliability evaluation of deck-to-rib welded joints in OSD considering stochastic traffic load and welding residual stress

Cui, Chuang; Zhang, Qinghua; Luo, Ying; Hao, Hong; Li, Jun

doi:10.1016/j.ijfatigue.2018.02.021

Cited by 69 publications

(23 citation statements)

References 25 publications

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“…In contrast, under the RB loading, the maximum circumferential stress appears at the weld side. Only the absolute magnitude is considered because of the high tensile welding residual stress at rib‐to‐deck welded joint . Owing to the higher contribution of the RB loading, the maximum circumferential stress of the specimen OB‐1 appears at the weld side.…”

Section: Validation Of the Proposed Equationsupporting

confidence: 85%

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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Section: Validation Of the Proposed Equationsupporting

confidence: 85%

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 orthotropic steel deck consists of a deck plate supported in mutually perpendicular directions; all these elements are connected by welded connections. Owing to the cyclic load stress caused by a high number of vehicles, fatigue cracks in orthotropic steel bridges significantly occur at partial-penetration fillet-welded connections [1][2][3][4][5][6][7]. Usually, enhancing the fatigue strength of welded joints, such as the rib-to-rib welded details, rib-to-crossbeam welded joints, and field splice joints of longitudinal ribs [3,[8][9][10] is an effective method to improve the fatigue resistance of the orthotropic steel decks.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Property and Improvement of a Rounded Welding Region between the Diaphragm Plate and Closed Rib of an Orthotropic Steel Bridge Deck

Zhang

Lü

2020

Metals

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By means of finite element modeling (FEM) and fatigue experiments, we study the fatigue performance of the rounded welding region between the diaphragm plate and closed rib of orthotropic steel bridge deck in this work. A local sub-model of the rounded welding region from the orthotropic steel bridge deck was developed to analyze the stress distributions. Based on the analysis results we designed the fatigue specimen for the fatigue test of this detailed structure. The fatigue experimental results revealed that the crack initiates from the weld toe of the rounded welding region and the stress concentration at the rounded welding region is the main mechanism of fatigue crack initiation. In addition, we propose three improvements to reduce the stress concentration of the rounded welding region, and the local structure optimization scheme of the diaphragm–rib weld can effectively improve the fatigue resistance of the detailed weld structure.

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“…Fu et al [17] performed a numerical solution for the dynamic response of a simply supported bridge with a switching crack subjected to seismic excitation and moving trains. Model test and in situ test have been considered as effective approaches to investigate the dynamic and mechanical performance of bridge structures [18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of a Long-Span Concrete-Filled Steel Tube Tied Arch Bridge and the Riding Comfort of Monorail Trains

et al. 2018

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In this study, a dynamic response analysis procedure is proposed and applied to investigate the dynamic responses of a straddle-type concrete-filled steel tube tied arch bridge under train and truck loadings. A numerical model of the coupled monorail train-bridge system is established to investigate the dynamic behaviors of the bridge under moving trains. A refined three-dimensional finite element model is built for the bridge and a 15 degrees-of-freedom vehicle model is presented for the train. The numerical model is validated using in-situ test results and then used to analyze the dynamic displacement and acceleration of the bridge and the trains on the bridge. Based on the simulation results, the impact factor of the bridge is investigated and the riding comfort of the trains is evaluated. The investigation results show that the impact factor of vehicle loads reaches the maximum value when the resonance of the bridge is induced by the moving vehicles. The effect of train braking predominates the longitudinal vibration of the bridge but is negligible in the transverse and vertical directions. The vehicle speed is the dominating factor for the riding comfort of the train.

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Fatigue reliability evaluation of deck-to-rib welded joints in OSD considering stochastic traffic load and welding residual stress

Cited by 69 publications

References 25 publications

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

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

Fatigue Property and Improvement of a Rounded Welding Region between the Diaphragm Plate and Closed Rib of an Orthotropic Steel Bridge Deck

Dynamic Response of a Long-Span Concrete-Filled Steel Tube Tied Arch Bridge and the Riding Comfort of Monorail Trains

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