Fatigue-Life Evaluation of a High-Speed Railway Bridge with an Orthotropic Steel Deck Integrating Multiple Factors

Song, Yong Sheng; Wang, Gao Xin; Li, Ai Qun

doi:10.1061/(asce)cf.1943-5509.0000887

Cited by 20 publications

(8 citation statements)

References 15 publications

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“…Orthotropic steel decks (OSDs) have been widely used as main girders in long-span bridges as a result of their high load-loading capacity, light weight, excellent aerodynamic, and speedy construction [1,2]. Recently, many fatigue cracks have been reported in OSDs in China and other countries.…”

Section: Introductionmentioning

confidence: 99%

Residual Stress Relaxation of DRWDs in OSDs under Constant/Variable Amplitude Cyclic Loading

et al. 2020

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An orthotropic steel deck (OSD) has a complicated structure, and its fatigue life is mainly determined by various welding details. Fatigue assessment of deck-to-rib welding details (DRWDs) under long-term train loads is an important concern for engineers. Properly assessing the initial residual stress and the mechanism of stress relaxation in DRWDs under long-term external loading is a prerequisite for predicting the fatigue damage and service life of OSDs. In this paper, a finite element analysis method is proposed to calculate the residual stress relaxation in DRWDs of OSDs under constant/variable amplitude cyclic loading. First, experiments on full-size OSD specimens were carried out using the hole drilling strain-gauge method, and the multi-axial distribution characteristics of residual stress on the sub-surface of the deck were obtained. On this basis, a refined residual stress analysis model of DRWDs using thermal-structural sequence coupling analysis and life and death unit technology is established, and the accuracy of the model is verified by the test data. Second, a coupling stress analysis model that considers the welding residual stress and mechanical stress using cyclic plastic constitutive model is established. The combined influence of number of cycles, stress amplitude, and stress ratio on multi-axial residual stress relaxation effect under constant/variable amplitude cyclic loading is investigated. Finally, a release formula of welding residual stress relaxation coefficient is proposed based on the external loading stress amplitude, stress ratio, and material yield stress. The results show that (1) with the increase in the number of loading cycles, the stress decreases until it is stabilized, while the global distribution of welding residual stress remains unchanged. Most of the welding residual stress release (about 95%) occurs in the first cycle; (2) the residual stress relaxation decreases with the increase in stress amplitude and increases linearly with the stress ratio; (3) the residual stress release is controlled by the maximum amplitude stress in the variable amplitude cyclic loading. After the residual stress is released, the stress will not continue to be released if the DRWDs have the same or smaller amplitude loading.

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Section: Introductionmentioning

confidence: 99%

Residual Stress Relaxation of DRWDs in OSDs under Constant/Variable Amplitude Cyclic Loading

et al. 2020

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“…However, the fatigue durability of OSDs encounters a challenge due to the aging of the structural materials combined with increasing traffic load (Lu et al, 2019; Zhang et al, 2020). Several authors have mentioned that fatigue is one of the main causes of structural failures (Deng et al, 2016, Lu et al, 2017b; Song et al, 2016), and it should be reflected as the primary consideration to extend the service life of bridge. Based on a review on fatigue cracks occurring in OSDs, different causes of fatigue cracking were distinguished (Chitoshi 2006; Kolstein 2007), and the authors generally agree with the following categories: (a) Cracking induced by welding crack-like defects: fatigue cracks initiate from welding defects introduced during manufacturing; (b) Load-induced cracking: fatigue cracking due to low fatigue strength of the connection details; and (c) Distortion-induced cracking: fatigue cracks initiation or growth due to out-of-plane stresses and deformations under the wheel loads.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack growth behavior of rib-to-deck double-sided welded joints of orthotropic steel decks

Liu

Chen

Wang

et al. 2020

Advances in Structural Engineering

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Innovative double-sided welding is expected to improve the fatigue resistance of rib-to-deck welded joints of orthotropic steel decks (OSDs). Welding crack-like defects are the crucial issue affecting the fatigue performance of rib-to-deck double-sided welded joints. This study presents a numerical simulation of three-dimensional (3D) mixed mode fatigue crack growth behavior of rib-to-deck double-sided welded joints of OSDs. Maximum tensile stress theory and equivalent stress intensity factor (SIF) were used to simulate mixed mode fatigue cracks growth. The Paris law model was employed to predict the fatigue life. Fatigue cracks of rib-to-deck double-sided welded joints were characterized by the presence of mixed mode cracks of modes I (open), mode II (shear), and mode III (tear), which was dominated by mode I. The equivalent SIF was found to be complex at the growth stage with the maximum value at the two ends of the crack front and the minimum value at the midpoint of the crack front. The crack shape became flatter in the later phase of the crack growth. The fatigue crack surface underwent deflections during crack growth, making the final crack shape exhibiting the characteristic of a spatial curved surface. The initial crack geometry showed a significant impact on the fatigue life.

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“…where, the q g(x,y,z) and q c(x,y,z) denote the gaussian and cylindrical heat sources respectively. R 1 is the effective radius of the superficial gaussian heat flux, the heat efficiency η is set to be 0.3, and Q 1 is the combustion heat at surface in Equation (1); R 2 is the effective radius of chemical reaction zone of steel with oxygen, Q 2 is the oxidation energy of steel, and H is the effective height of cylindrical distribution in Equation (2). In the present study, H was taken as the thickness of the steel plate, and R 2 was identical to the half width of the cutting seam.…”

Section: Heat Source Model and Thermal Analysismentioning

confidence: 99%

“…Orthotropic steel decks (OSDs) are widely used in long-span bridges because of their superior features, such as overall light self-weight, fast construction, high loading capacity, etc. [ 1 , 2 ]. However, OSDs are prone to fatigue problems under repeated traffic loads [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

The Evolution of Residual Stress in Rib-Diaphragm Joints of Orthotropic Steel Decks Subjected to Thermal Cutting and Welding

Xiong

Chen

et al. 2020

Materials

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Residual stresses change the stress ratio of fluctuating stresses, hence seriously affect the fatigue life of orthotropic steel decks (OSDs) under traffic loading. Residual stress distributions near the U rib-diaphragm joints are very complicated and need to be investigated further. In this paper, a systematic method has been proposed for calculating the residual stress field in the joint of U rib and diaphragm due to thermal cutting and welding. Firstly, a mathematical model of cutting heat sources was established to predict the temperature field. Then, a numerical elastoplastic thermomechanical model was built to predict the residual stress evolutions in a diaphragm-rib joint through the whole fabrication process involving flame cutting and welding. Moreover, the simulated temperature contours at the fusion zone and the residual stress distributions in the rib-diaphragm joint were compared and verified against the experimental ones. The numerical results showed a great agreement with the experimental ones, indicating that the heat source model can be used to accurately predict the temperature field during flame cutting. Finally, the validated numerical model was utilized to conduct parametrical analyses on the effects of thermal processing rates, e.g., the cutting and welding speeds and on the residual stress distribution in the rib-diaphragm joint. The results indicate that a faster cutting speed and a slower welding speed can decrease the residual stress magnitude at the rib-diaphragm joints and reduce the high-stress zone near the diaphragm cutouts.

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Fatigue-Life Evaluation of a High-Speed Railway Bridge with an Orthotropic Steel Deck Integrating Multiple Factors

Cited by 20 publications

References 15 publications

Residual Stress Relaxation of DRWDs in OSDs under Constant/Variable Amplitude Cyclic Loading

Residual Stress Relaxation of DRWDs in OSDs under Constant/Variable Amplitude Cyclic Loading

Fatigue crack growth behavior of rib-to-deck double-sided welded joints of orthotropic steel decks

The Evolution of Residual Stress in Rib-Diaphragm Joints of Orthotropic Steel Decks Subjected to Thermal Cutting and Welding

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