Fatigue crack initiation prediction of cope hole details in orthotropic steel deck using the theory of critical distances

Zhou, Hui; Wen, Jianian; Wang, Z.; Zhang, Y.; Du, Xian

doi:10.1111/ffe.12402

Cited by 17 publications

(9 citation statements)

References 29 publications

(64 reference statements)

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“…By taking as a starting point the pivotal work done by Susmel and Taylor [24][25][26][27] , Liu and Yan 28 proposed a new multiaxial notch fatigue life prediction method based on the TCD, with the accuracy of this approach being checked against a large number of experimental results. Zhou et al 29 used the TCD to perform the fatigue assessment of orthotropic steel decks, whereas Gorouhi 30 investigated the accuracy of the TCD in assessing the fatigue strength of those riveted structural details that are commonly employed in bridges. In parallel, Taylor et al 31 , Susmel et al [32][33][34] and Karakaş et al 35 demonstrated that the TCD is also successful in estimating fatigue damage in welded joints made of steel, aluminium alloys, and magnesium alloys.…”

Section: Introductionmentioning

confidence: 99%

High‐strength steel wires containing corrosion pits: stress analysis and critical distance based fatigue life estimation

Jie

Susmel

2019

Fatigue Fract Eng Mat Struct

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Section: Introductionmentioning

confidence: 99%

High‐strength steel wires containing corrosion pits: stress analysis and critical distance based fatigue life estimation

Jie

Susmel

2019

Fatigue Fract Eng Mat Struct

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“…The results show that when cope-hole details were subjected to significant shear stress, the burr grinding had little improvement on the fatigue strength. For cope-hole details in the orthotropic steel bridge deck, the fatigue crack initiation was predicted by critical distance theory (Zhou, Wen, Wang, Zhang, & Du, 2016). The initiation life of fatigue crack based on the critical distance theory and the S-N curve of raw materials was in good agreement with the fatigue test results.…”

Section: Introductionmentioning

confidence: 55%

Fatigue Life Assessment and Reliability Analysis of Cope-Hole Details in Steel Bridges

Liao

Wang

Zhang

et al. 2020

BJRBE

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Cope-hole details are widely applied to steel bridges. However, the safety of steel bridges is influenced by the fatigue performance of welded details. So, cope-hole details with flange and web subjected to axial loads were selected as the research object. Based on the basic theory of linear elastic fracture mechanics and the Finite Element Method, the stress intensity factors of cope-holes details were calculated. The influences of geometry size and crack size of the detail on the stress intensity factors were then investigated. The Paris model of fatigue crack propagation predicted the crack propagation life of cope-hole details. Besides, the fatigue limit-state equation was also established to analyse the effect of random variables (such as initial crack size, critical crack size, crack propagation parameter) on the fatigue reliability index. Finally, the recommended value of the detection period was present. The results show that the stress intensity factor gradually increases with the increase of the cope-hole radius, the weld size, the flange plate thickness, the crack length and the web thickness. However, it gradually decreases with the increase of the ratio of the long and short axle to the crack. The predicted number of fatigue cyclic loading required by the fatigue crack depth propagating from 0.5 mm to 16 mm under nominal stress amplitude of 63 MPa is 122.22 million times. The fatigue reliability index decreases with the fatigue growth parameter, the crack shape ratio and the mean of initial crack size increasing, which is relatively sensitive. However, the variation coefficient of the initial crack size has little effect on it. The detection period of cope-hole details is the service time corresponding to the fatigue accumulated cyclic loading of 198.3 million times.

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“…These methods are common in fatigue reinforcement engineering projects of OSDs. However, removing short cracks by enlarging and optimizing the geometry of the cutout is a fast and effective method of mitigating fatigue damage; such a process excises short cracks around diaphragm cutouts and simultaneously reduces stress concentrations [7,23]. In addition, partial or complete removal of long fatigue cracks around diaphragm cutouts is often necessary before diaphragm rehabilitation by bolting or bonding with steel plates near the cutouts.…”

Section: Introductionmentioning

confidence: 99%

“…The effectiveness of fatigue retrofits of diaphragm cutouts is often determined by the maximum concentration stress [23][24][25]. The cycling stresses and the magnitudes of stress amplitude lead to fatigue failure [26][27][28][29], which is also reflected in the "safe life" design [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Retrofit Fatigue Cracked Diaphragm Cutouts Using Improved Geometry in Orthotropic Steel Decks

Chen

et al. 2020

Applied Sciences

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Diaphragm cutouts are set to release redundant constraints and hence reduce weld fatigue at the connection of U-ribs to diaphragms in orthotropic steel decks. However, most fatigue cracks which originate from the edge of cutouts are in fact detected in the diaphragms. Therefore, a retrofit technology on cracked cutouts at the diaphragm is proposed and applied to the orthotropic steel box girder of a suspension bridge. Firstly, the stress concentration on the cutout is analyzed through refined finite element analyses. Furthermore, the fatigue cracked cutouts are retrofitted by changing their geometrical parameters. Thereafter, an optimized geometry and the size of diaphragm cutouts were confirmed and applied in the rehabilitation of a suspension bridge. On-site wheel load tests were carried out before and after retrofitting of the diaphragm cutout. The stress distributions along the edges of the cutouts and at the side of a diaphragm were measured under a moving vehicle. The stress spectra at two critical locations on the edge of a cutout was obtained under longitudinally and laterally moving vehicles. Finally, the fatigue life of the cutouts is assessed by the modified nominal stress method. The analytical and test results indicate that the wheel loads on the deck transmit stress to the diaphragms through the U-ribs, during the load transmission process, the stress flow is obstructed by diaphragm cutouts, resulting in local stress concentrations around the cutouts. In addition, the overall size of the cutouts should be small, but the radius of the transition arc should be large, thus the stress flow will not be obviously obstructed. After the retrofitting of the cutouts by improved geometry, the maximum stress decreases by 87.6 MPa, which is about 40% of the original stress. The equivalent constant amplitude stress is reduced by 55.2% when the lateral position of the wheel loads is taken into consideration. Based on the stresses obtained by finite element analysis (FEA) and experimental tests, the fatigue lives of the original cutouts are 1.7 and 4.9 years, respectively, which increase to 78.1 and 155.5 years, respectively, after the cutouts were retrofitted, which indicates that the improved geometry and retrofit technology can enhance the fatigue performance and extend the fatigue life of diaphragm cutouts with fatigue cracks.

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Fatigue crack initiation prediction of cope hole details in orthotropic steel deck using the theory of critical distances

Cited by 17 publications

References 29 publications

High‐strength steel wires containing corrosion pits: stress analysis and critical distance based fatigue life estimation

High‐strength steel wires containing corrosion pits: stress analysis and critical distance based fatigue life estimation

Fatigue Life Assessment and Reliability Analysis of Cope-Hole Details in Steel Bridges

Retrofit Fatigue Cracked Diaphragm Cutouts Using Improved Geometry in Orthotropic Steel Decks

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