scholarly journals Fatigue Analysis of a Railway Steel Bridge

2018 ◽  
Vol 7 (3.12) ◽  
pp. 1098 ◽  
Author(s):  
Kandagatla Viswanatj ◽  
M Ravi Kumar
Keyword(s):  
Fatigue Life ◽  
Fatigue Loading ◽  
Critical Section ◽  
Point Of View ◽  
Elastic Behaviour ◽  
Steel Bridge ◽  
Railway Bridge ◽  
Design Loads ◽  
Steel Railway Bridge ◽  
Coefficient Method

One of the significant means of transportation in India are railways and has many steel bridges which are very old having historical importance and their design period is terminating. To appraisal, the levels of damage for workable repairs, stands a tedious job for government authorities. The prediction of fatigue life of bridges are important because at present these are subjected to elephantine loads than the design loads and the environmental conditions boost these aspects to turn up fatigue life. This paper studies the analytical analysis of a steel railway bridge subjected to EURO and INDIAN fatigue loading to evaluate the fatigue life of a bridge and stresses are calculated from S-N curves by nominal stress method. The fatigue verification has been done by λ-coefficient method. Fatigue life of critical section was found out by sub-modelling the welded joint where the stress are maximum. The crack initiation starts at powerless members and propagates it along the section leads to fracture the entire structure under elastic behaviour. Hence, if the results of the critical section are satisfactory, it can be concluded that entire bridge is safe in fatigue point of view. INDIAN HM loadings generate more damage than EURO LM-71 loading.  

scholarly journals Environment-assisted fatigue of steel bridges: A conceptual framework for life assessment

2021 ◽  
Vol 1201 (1) ◽  
pp. 012045
Author(s):  
J S S Sandviknes ◽  
N D Adasooriya ◽  
D Pavlou ◽  
T Hemmingsen
Keyword(s):  
Fatigue Life ◽  
Structural Integrity ◽  
Steel Bridges ◽  
Life Assessment ◽  
Steel Bridge ◽  
Corrosive Environment ◽  
Railway Bridge ◽  
Strength Curve ◽  
The Difference

Abstract This paper presents a framework based on a recently proposed fatigue strength curve of corroded steel to assess the life of an existing steel bridge exposed to environment-assisted fatigue. Environment-assisted cracking (EAC) and how it affects the structural integrity of steel bridges are introduced by the framework. Determination of both corroded and uncorroded details in a corrosive environment are also included in this framework. To conform the applicability and significance, a fatigue life of a railway bridge was assessed by methods given in the framework. The obtained fatigue lives were compared. The difference of the estimated fatigue lives emphasizes the importance of having this framework to consider the interaction of corrosion and fatigue mechanisms.

FATIGUE LIFE EVALUATION FOR THE FLOOR SYSTEM OF A STEEL RAILWAY BRIDGE

2008 ◽  
Author(s):  
DONG-HO CHOI ◽  
HANG-YONG CHOI ◽  
HOON YOO ◽  
JOUNG-SUN LEE ◽  
SEOK-KYUN PARK
Keyword(s):  
Fatigue Life ◽  
Railway Bridge ◽  
Life Evaluation ◽  
Fatigue Life Evaluation ◽  
Steel Railway Bridge ◽  
Floor System

Equivalent nosing force for a steel railway bridge based on in situ measurements

2021 ◽  
Author(s):  
Lazar Georgiev ◽  
Lyubomir Zdravkov ◽  
Vatyu Tanev ◽  
Milcho Lepoev
Keyword(s):  
In Situ Measurements ◽  
Railway Bridge ◽  
Open Type ◽  
Long Span ◽  
Out Of Plane ◽  
Design Loads ◽  
The Republic ◽  
Design Speed ◽  
Steel Railway Bridge

<p>The weight and design speed of the railway vehicles increases in time. As a result, the values of design loads grow up. In old Bulgarian standard [1] the equivalent nosing force is prescribed as 60kN. In the present EN1991-2 [2] this value is 100kN. Meanwhile, a significant part of the very old bridges is not designed for nosing forces. In cases of long span between cross girders of the “open type” deck and lack of nosing braces, the load bearing capacity of longitudinal girders, concerning out of plane bending moments due to nosing forces, is insufficient. To investigate the value of equivalent nosing force are provided “in situ” measurements on the longitudinal girders of “open type” deck of a steel riveted railway bridge in exploitation in the Republic of Bulgaria. The strains and horizontal linear deformations are measured in the midspan of the longitudinal beams for real trains. The equivalent nosing force is calculated using developed procedures.</p>

Fatigue Phenomenon Analysis of the Steel Railway Bridges with Short and Medium Span

2014 ◽  
Vol 587-589 ◽  
pp. 1416-1419
Author(s):  
Stefan I. Gutiu ◽  
Catalin Moga
Keyword(s):  
Comparative Analysis ◽  
Design Activity ◽  
Steel Bridge ◽  
Railway Bridge ◽  
Railway Bridges ◽  
Steel Railway Bridge

This paper presents the fatigue checking methodology of the steel bridge members according to Romanian norm SR 1911-98 and EN 1993-1-9. A comparative analysis regarding the fatigue checking of the main girders of a 30 m span steel railway bridge is made. The concluding remarks and observations are useful in the design activity of this type of structures.

Lamellar Tearing Observations Regarding the Application of European Standards in the Field of Welded Steel Constructions

2018 ◽  
Vol 69 (6) ◽  
pp. 1352-1354
Author(s):  
Anamaria Feier ◽  
Oana Roxana Chivu
Keyword(s):  
Bearing Capacity ◽  
Brittle Failure ◽  
Engineering Practice ◽  
Steel Bridge ◽  
Railway Bridge ◽  
Welded Steel ◽  
Direct Replacement ◽  
Lamellar Tearing ◽  
European Standards ◽  
Comprehensive Study

The problem of corrosion for old steel bridges in operation is often solved by direct replacement of elements or structure. Only a few studies have been done to determine the efforts influenced by corrosion in those elements. In general, it is considered that a corroded element has exceeded the bearing capacity and should be replaced, but if the corroded element is secondary it could be treated and kept. A factor in the rehabilitation of an old steel bridge in operation is the aspect of structure. If the structure is corroded, rehabilitation decision is taken is easier. Lamellar tearing describes the cracking that occurs beneath the weld and can be characterized as a brittle failure of steel, in the direction perpendicular to the plane of rolling. The paper presents a comprehensive study on lamellar tearing and summarizes some conclusions about the prevention of them. The conclusions will be exemplified in the case of a railway bridge, with a main truss girder. The paper presents also some observations regarding the stress analysis in fillet welds, resulting from the engineering practice.

Study on the stiffness degradation in concrete continuous beam with externally prestressed CFRP tendons under fatigue loading

2021 ◽  
pp. 136943322199249
Author(s):  
Xing Li ◽  
Jiwen Zhang ◽  
Jun Cheng
Keyword(s):  
Fatigue Life ◽  
Fatigue Loading ◽  
Load Level ◽  
Fiber Reinforced Polymer ◽  
Stiffness Degradation ◽  
Test Results ◽  
Reinforced Polymer ◽  
Continuous Beams ◽  
Practical Engineering ◽  
Good Agreement

This paper presents fatigue behaviors and the stiffness degradation law of concrete continuous beams with external prestressed carbon fiber-reinforced polymer (CFRP) tendons. Three specimens were tested under fatigue loading, and the influence of different load levels on the stiffness degradation and fatigue life were studied, and it was found that the stiffness degradation of three test specimens exhibited a three-stage change rule, namely rapid decrease, stable degradation, and sharp decline, but there are obvious differences in the rate and amplitude of stiffness degradation. The load level has a significant influence on the fatigue life of the test specimens. An analytical model with load level considered was proposed to calculate the residual stiffness and predict the stiffness degradation, which is in good agreement with the test results. The model of stiffness degradation presents a possible solution for practical engineering applications of concrete continuous beams with externally prestressed CFRP tendons subjected to different fatigue loadings.

A Multi-Level Low Cycle Fatigue Damage Model for Forging Die Material

2006 ◽  
Vol 514-516 ◽  
pp. 804-809
Author(s):  
S. Gao ◽  
Ewald Werner
Keyword(s):  
Fatigue Life ◽  
Fatigue Damage ◽  
Low Cycle Fatigue ◽  
Damage Model ◽  
Fatigue Loading ◽  
Cycle Fatigue ◽  
Die Material ◽  
Multi Level ◽  
Loading Sequence ◽  
Forging Die

The forging die material, a high strength steel designated W513 is considered in this paper. A fatigue damage model, based on thermodynamics and continuum damage mechanics, is constructed in which both the previous damage and the loading sequence are considered. The unknown material parameters in the model are identified from low cycle fatigue tests. Damage evolution under multi-level fatigue loading is investigated. The results show that the fatigue life is closely related to the loading sequence. The fatigue life of the materials with low fatigue loading first followed by high fatigue loading is longer than that for the reversed loading sequence.

A Study of Nozzles in Pressure Vessels under Pressure Fatigue Loading

1967 ◽  
Vol 182 (1) ◽  
pp. 657-684 ◽  
Author(s):  
J. Spence ◽  
W. B. Carlson
Keyword(s):  
Fatigue Life ◽  
Mild Steel ◽  
Pressure Vessel ◽  
Special Interest ◽  
Maximum Stress ◽  
Fatigue Loading ◽  
Fatigue Tests ◽  
Pressure Vessels ◽  
Full Size

Nozzles in cylindrical vessels have been of special interest to designers for some time and have offered a field of activity for many research workers. This paper presents some static and fatigue tests on five designs of full size pressure vessel nozzles manufactured in two materials. Supporting and other published work is reviewed showing that on the basis of the same maximum stress mild steel vessels give the same fatigue life as low alloy vessels. When compared on the basis of current codes it is shown that mild steel vessels may have five to ten times the fatigue life of low alloy vessels unless special precautions are taken.

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