Fatigue tests and fatigue assessment approaches for rib-to-diaphragm in steel orthotropic decks

Zhang, Qinghua; Cui, Chuang; Bu, Yizhi; Liu, Yiming; Ye, Huawen

doi:10.1016/j.jcsr.2015.07.014

Cited by 84 publications

(23 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the bridge fatigue life evaluation under actual traffic load belongs to the high cycle fatigue problem, with low stress amplitude [19]. The slope of At present, the main approaches used for steel bridge fatigue life evaluation [5][6][7] include the nominal stress approach, the extrapolation hot spot stress approach, and equivalent structural stress approach. The nominal stress approach has been applied to some bridge design codes [8,9], but it adopts different S-N curves for different welded joint types, and it is difficult to determine the location of nominal stress points of complex structure joints accurately with this approach [10].…”

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

confidence: 99%

“…where the structural hot spot stress ∆σ s is calculated by Equation (6) or Equation (7). t * is the relative thickness with respect to a unit thickness of, say, 1 mm (i.e., t * = t/1mm).…”

Section: Stress-based Integration Equivalent Structural Stress Approachmentioning

confidence: 99%

“…(1) The principal stress σ x (y, z) of the weld toe section is extracted from FEM. Then, the structural stress value σ s is obtained by substituting σ x (y, z) into Equation (7). Then, the equivalent structural stress S s is obtained by substituting σ s into Equation (10).…”

Section: Fatigue Life Calculation Of Jiangyin Bridge Based On the Strmentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

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.

show abstract

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

confidence: 99%

Section: Stress-based Integration Equivalent Structural Stress Approachmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

show abstract

“…In the static analysis, concrete and ordinary rebar were made with isotropous elastic constitutive models [24]. In the fatigue simulation analysis, they were made with anisotropic elastic constitutive models [25]. A steel block was placed on the midspan to avoid the excessive concentration of strain.…”

Section: Parameters Of Finite Element Modelingmentioning

confidence: 99%

Fatigue Simulation Analysis of Carriageway Plates of Reinforced Concrete T-Shaped Girders

Zhang¹,

Chen²,

Jia³

et al. 2019

JESTR

View full text Add to dashboard Cite

The carriageway plate, which is a bridge structure, directly bears the traffic load and can cause fatigue rupture easily by repeated loading. This study put forward an analysis model of reinforced concrete T-shaped girder carriageway plate girders to reveal the law of the influences of internal factors, such as length-width and thickness-width ratios of two-and one-way slabs, on the fatigue performance of carriageway plates. The physical girder space model was established using the Midas/FEA finite element software. The correlation between the fatigue stress level, length-width ratio, and thickness-width ratio of carriageway plates and the fatigue performance of carriageway plates of ribbed-girder bridges was analyzed using traditional fatigue analysis methods based on the S-N curve and Miner linear cumulative damage theory. The fatigue life and rupture areas were determined. The change rules of fatigue life and damage degrees of structure girders under different influencing factors were determined. Results show that a significant negative correlation exists between the length-width ratio and fatigue life of carriageway plate when the length-width ratio of one-way slabs ranges from 4.0 to 6.0. The fatigue life decreases linearly with the increase in the length-width ratio when the lengthwidth ratio of two-way slabs ranges from 1.0 to 1.9. The anti-fatigue performance of two-way slabs is stronger than that of one-way slabs. In addition, setting the thickness-width ratio of a carriageway plate between 0.07 and 0.08 is economically reasonable. This study provides a certain reference value for the further perfection of the anti-fatigue design of carriageway plates of reinforced concrete ribbed-girder bridges.

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

Fatigue tests and fatigue assessment approaches for rib-to-diaphragm in steel orthotropic decks

Cited by 84 publications

References 10 publications

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

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

Fatigue Simulation Analysis of Carriageway Plates of Reinforced Concrete T-Shaped Girders

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

Contact Info

Product

Resources

About