Extending fatigue life for steel bridge by girder link method and its verification

2014 ◽  
pp. 1428-1435
Author(s):  
O Shokaku ◽  
Y Aoki ◽  
A Tabata ◽  
K Tokumasu
Keyword(s):  
Fatigue Life ◽  
Steel Bridge

scholarly journals New Damage Evolution Law for Steel–Asphalt Concrete Composite Pavement Considering Wheel Load and Temperature Variation

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3723 ◽  
Author(s):  
Xunqian Xu ◽  
Xiao Yang ◽  
Wei Huang ◽  
Hongliang Xiang ◽  
Wei Yang
Keyword(s):  
Fatigue Life ◽  
Fatigue Damage ◽  
Damage Evolution ◽  
Steel Bridge ◽  
Wheel Load ◽  
Evolution Law ◽  
Long Span ◽  
Fatigue Design ◽  
Epoxy Asphalt

Epoxy asphalt (EA) concrete is widely used in constructing long-span steel bridge pavements (SBDPs). This study aims to derive a fatigue damage evolution law, conducting an experimental investigation of SBDP. First, a general theoretical form of the fatigue damage evolution law of materials is established based on the thermal motion of atoms. Then, fatigue experiments demonstrate that this evolution law well represents the known damage–life relationships of SBDP. Taking into account the experimental relationships between damage and fatigue life under symmetrical cyclic loadings with different overload amplitudes and temperature variations, a detailed damage evolution law is deduced. Finally, the role of damage accumulation is discussed on the basis of the proposed damage evolution law for the extreme situation of heavy overload and severe environments. The results show that both heavy loading and falling temperatures increase the fatigue damage of SBDP considerably. EA shows a fatigue life two to three times longer than that of modified matrix asphalt (SMA) or guss asphalt (GA). For the same thickness, EA pavement is demonstrated to be more suitable for an anti-fatigue design of large-span SBDP under high traffic flows and low temperatures.

scholarly journals Numerical investigation of the cope hole shape impact on fatigue life of welded joints in steel bridges

2019 ◽  
Vol 252 ◽  
pp. 07008
Author(s):  
Krzysztof Śledziewski
Keyword(s):  
Fatigue Life ◽  
Welded Joints ◽  
Hot Spot ◽  
Experimental Studies ◽  
Free Access ◽  
Steel Bridge ◽  
High Concentration ◽  
Hole Shape ◽  
Weld Toe ◽  
The Impact

Holes in the bridge girders are usually made at the joint of strips. In most cases, they are made when there is a need to make double-sided butt welds and in order to avoid welds crossing. Size of the hole is selected in order to allow full penetration of the strips across their whole width and also to ensure free access to the welds during NDT. Welded joints with holes, due to low fatigue life, are critical elements affecting durability of large-span steel bridge structures. Low fatigue life of joints with holes results mostly from high concentration of stresses near the weld toe caused by local reduction of cross-section. The paper covers parametric studies based on finite elements method in order to determine the impact of geometrical changes of the hole shape on distribution of stresses within probable areas of cracks initiation and durability of such joint. With reference to experimental studies results, four different holes geometries were analysed: semi-circle (conventional), triangle, parabola of second degree and oval. Assessment of the fatigue was performed using the so-called hot spot method, i.e. geometrical stresses. Results of the studies show that geometrical change of the hole shape affects the stresses concentration change, but it does not translate to the increase of fatigue life of such joint.

Fatigue Analysis of a Self-Propelled Steel Bridge for Life-Customized Design

2010 ◽  
Vol 139-141 ◽  
pp. 1249-1254
Author(s):  
Wei Ping Peng ◽  
Min Peng ◽  
Zhao Liu ◽  
Yan Hong Wei ◽  
Re Xia
Keyword(s):  
Fatigue Life ◽  
High Speed ◽  
Engineering Application ◽  
Time History ◽  
Fatigue Analysis ◽  
Product Structure ◽  
Structure Design ◽  
Steel Bridge ◽  
Fe Method ◽  
Strength And Stiffness

Structure design of a product under complex loads not only must meet the conditions of its strength and stiffness, but also must consider the requirements of its fatigue life. Due to the lack of historical data of actual loads and stress, it is usually difficult to predict the fatigue life of product structure in life-customized design. Taking self-propelled steel bridge as an example, which is used for spoil transportation of tunnel construction in the Beijing-Shanghai high-speed railway projects, this paper presents a method of fatigue analysis for product structure for life-customized design. The approach of this work includes steps of (1) simulating actual work and load conditions of the bridge based on finite-element (FE) method, and determining risk components of the bridge, (2) analyzing the stress time history of dangerous components of the bridge, and drawing out the stress spectrum to solve the bottleneck problem of fatigue life calculation in the bridge design, (3) correcting the material S-N curves and predicting the fatigue life of the bridge based on Miner linear cumulative damage theory. The results of this research will facilitate implementation of life-customized design, thus meet the requirements of expected life of the bridge, and also improve the reliability and security of the bridge in engineering application.

An alternative Approach of Fatigue Life Predictions in Orthotropic Steel Bridge Decks

2012 ◽  
Vol 18 (16) ◽  
pp. 988-995 ◽  
Author(s):  
Wim Nagy ◽  
Hans De Backer ◽  
Philippe Van Bogaert
Keyword(s):  
Fatigue Life ◽  
Bridge Decks ◽  
Steel Bridge ◽  
Alternative Approach ◽  
Life Predictions

Structural Stress Analysis of Trough to Deck Plate Weld in Orthotropic Steel Bridge Decks

2012 ◽  
Vol 204-208 ◽  
pp. 3270-3274
Author(s):  
Man Man Wang ◽  
Ce Chen ◽  
Bo Hai Ji ◽  
Rong Liu ◽  
Duan Duan Zhao
Keyword(s):  
Fatigue Life ◽  
Fem Analysis ◽  
Extrapolation Method ◽  
Steel Bridge ◽  
Structural Stress ◽  
Coarse Mesh ◽  
Mesh Model ◽  
Deck Plate ◽  
Element Type ◽  
Steel Deck

A comparative study among five methods to calculate the structural stress of the trough to deck plate joint in orthotropic steel deck was carried out. The five methods used are surface stress extrapolation method (SSE), Haibach method, Xiao and Yamada method and CAB method. FEM analysis shows the five methods are mesh sensitive. Structural stress calculated using element type solid95 is larger than that of solid45. For fine and medium mesh model, structural stress calculated by Haibach method is larger than other methods, which means a lower fatigue life. Structural stress calculated by Yamada method is lower than other methods, which means a higher fatigue life than that calculated by other methods. For coarse mesh model, structure stress calculated by quadratic extrapolation method is larger than other methods, and, structural stress calculated by Yamada method is much lower than other methods.

scholarly journals Numerical Simulation of Fatigue Performance of Diaphragm of Large-Span Bridge Orthotropic Deck

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-19
Author(s):  
Hui Li ◽  
Bo Zhao ◽  
Han Zhu
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Fatigue Life ◽  
Finite Element Model ◽  
Element Model ◽  
Life Assessment ◽  
Steel Bridge ◽  
Large Span ◽  
Finite Element Software ◽  
Fatigue Life Assessment

Under traffic loads, orthotropic steel bridge slabs suffer from an obvious fatigue problem. In particular, fatigue cracking of diaphragms seriously affects application and development of orthotropic bridge slabs. In the paper, based on cracking status quo of an orthotropic deck diaphragm of a large-span bridge, experimental tests were formulated to test stress distribution states of the diaphragm. The finite element software ABAQUS was used to establish a finite element model of the orthotropic deck diaphragm; numerical simulation was conducted on the basis of the experiments. Simulation results were compared with experimental results, so correctness of the finite element model was verified. Finally, Local Strain Approach (LSA) and Theory of Critical Distance (TCD) were used to conduct life assessment of the orthotropic deck diaphragms, and applicability of two methods was discussed. In this way, a fatigue life assessment method with high accuracy and good operability was provided for fatigue life assessment of orthotropic deck diaphragms.

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