scholarly journals Probabilistic fatigue analysis of existing steel structure

2020 ◽  
Vol 310 ◽  
pp. 00012
Author(s):  
Martin Krejsa ◽  
Jiří Brožovský ◽  
Petr Lehner ◽  
Stanislav Seitl ◽  
Zdeněk Kala ◽  
...  
Keyword(s):  
Fatigue Damage ◽  
Stochastic Analysis ◽  
Steel Structure ◽  
Linear Fracture ◽  
Time Calibration ◽  
Load Effects ◽  
Edge Cracks ◽  
Resistance Assessment ◽  
Loaded Structure ◽  
Over Time

The paper deals with evaluation of possible fatigue damage of existing steel crane structure. It is possible to use the some traditional methods to solve the problem - a concept of fatigue S-N curves (which are mainly used for designing of a new structures) or the procedures based on linear fracture mechanics utilizing the Paris-Erdogan’s law (which are suitable for estimation of remaining lifetime). For the resistance assessment the relevant data of load effects caused by cyclically loaded structure operation are necessary for both concepts. For the prediction of fatigue damage over time, calibration functions for short edge cracks were derived based on the results of the experiment, and the acceptable size of the fatigue crack in damaged structural component under analysis was determined. Using the derived relationships, a stochastic analysis of the selected element was performed and the results are discussed.

scholarly journals Probabilistic prediction of fatigue damage based on linear fracture mechanics

2016 ◽  
Vol 11 (39) ◽  
pp. 143-159 ◽  
Author(s):  
M. Krejsa ◽  
L. Koubova ◽  
J. Flodr ◽  
J. Protivinsky ◽  
Q. T. Nguyen
Keyword(s):  
Fracture Mechanics ◽  
Fatigue Damage ◽  
Probabilistic Prediction ◽  
Linear Fracture Mechanics ◽  
Linear Fracture

scholarly journals A Multiaxial Notch Fatigue Methodology to Estimate In-Service Lifetime of Corroded Cast Iron Water Pipes

2013 ◽  
Vol 577-578 ◽  
pp. 125-128
Author(s):  
W. Brevis ◽  
Luca Susmel ◽  
J.B. Boxall
Keyword(s):  
Cast Iron ◽  
Fatigue Damage ◽  
Fatigue Loading ◽  
Multiaxial Fatigue ◽  
Variable Amplitude ◽  
Water Pipes ◽  
Service Lifetime ◽  
Curve Method ◽  
Over Time

The present paper summarises an attempt of using the so-called Modified Wöhler Curve Method (MWCM) to estimate fatigue damage in pitted cast iron water pipes subjected to in-service variable amplitude multiaxial fatigue loading. In this setting, pits are treated as hemispherical/hyperbolic notches whose depth increases over time due to conventional corrosion processes taking places in buried cast-iron pipes. The validity of such an approach is proven by showing, through a case study, that, under particular circumstances, the combined effect of corrosion and fatigue can remarkably shorten the in-service lifetime of cast-iron pipes as observed in the case study.

Soil–steel structure design by the Ontario Code: Part 2. Structural considerations

1981 ◽  
Vol 8 (3) ◽  
pp. 331-341 ◽  
Author(s):  
G. Abdel-Sayed ◽  
Baidar Bakht
Keyword(s):  
Steel Structure ◽  
Steel Structures ◽  
Empirical Method ◽  
Structure Design ◽  
Live Load ◽  
Finite Element Program ◽  
Worked Example ◽  
Metallic Shell ◽  
Element Program ◽  
Load Effects

The paper presents provisions of the Ontario Bridge Design Code for the structural design of the metallic shell of soil–steel structures, and also discusses the development background of these provisions. A simplified method of determining live load effects in the metallic shell is presented. The method is based on results of a well-tested plane strain finite element program. An empirical method for determining live load effects, which is based on tests of full-size structures, is also given. A worked example is given to illustrate the usage of the design provisions.

scholarly journals Fatigue analysis of a bridge deck using the peaks-over-threshold approach with application to the Millau viaduct

2020 ◽  
Vol 2 (8) ◽  
Author(s):  
Mariia Nesterova ◽  
Franziska Schmidt ◽  
Christian Soize
Keyword(s):  
Fatigue Damage ◽  
Extreme Values ◽  
Initial Distribution ◽  
Linear Extrapolation ◽  
Peaks Over Threshold ◽  
Innovative Method ◽  
Structural Details ◽  
Load Effects ◽  
Existing Bridges ◽  
Threshold Approach

AbstractUsually, to estimate the fatigue life of structural details in existing bridges, fatigue damage assessed with monitoring data is extrapolated linearly in time. In this study, a methodology is proposed for predicting the numbers of fatigue cycles with the peaks-over-threshold approach. On the other side, this POT approach, which is based on extreme values, is, as usually, also used to predict the load effects of extreme amplitude. This provides an innovative method to predict fatigue damage, which considers the initial distribution of numbers of cycles over time. It may account for traffic growth in volume and mass. This paper shows the comparison between reliability indexes assessed with the proposed method and the linear extrapolation.

Comparison of Calibration Functions for Short Edge Cracks under Selected Loads

2017 ◽  
Vol 754 ◽  
pp. 353-356 ◽  
Author(s):  
Stanislav Seitl ◽  
Petr Miarka ◽  
Lucie Malíková ◽  
Martin Krejsa
Keyword(s):  
Fatigue Crack ◽  
Fatigue Cracks ◽  
Steel Structures ◽  
Initial Crack ◽  
Pure Bending ◽  
Short Edge ◽  
Four Point Bending ◽  
Linear Fracture ◽  
Long Time ◽  
Edge Cracks

Attention to the fatigue cracks in steel structures and bridges has been paid for long time. In spite to efforts to eliminate the creation and propagation of fatigue cracks throughout the designed service life, cracks are still revealed during inspections. Note, that depending on location of initial crack, the crack may propagate from the edge or from the surface. The theoretical model of fatigue crack progression is based on linear fracture mechanics. Steel specimens are subjected to various load (tension, three-and four-point bending, pure bending etc.). The calibration functions for short edge cracks are compared for various load and the discrepancies are discussed.

Analysis of Cracks and Stresses of Welded Attachments on Full-Scale Plate Girder under Fatigue Loading

2006 ◽  
Vol 324-325 ◽  
pp. 459-462 ◽  
Author(s):  
Myung Gu Lee ◽  
Seung Yong Lee ◽  
Cheol Woo Park
Keyword(s):  
Fatigue Damage ◽  
Fatigue Cracks ◽  
Steel Structure ◽  
Fatigue Loading ◽  
Design Criterion ◽  
Full Scale ◽  
Parent Metal ◽  
Girder Bridges ◽  
Fatigue Design ◽  
Plate Girder

In steel structure systems such as plate girder bridges and framed structures, fatigue damage used to occur at welded areas rather than primary structural members. These damages and behaviors of the welded attachments need to be extensively investigated so that the fatigue design criterion can effectively control the fatigue damage of steel structure systems. This study utilized a full-scale plate girder on which various welding attachments were mounted. The welded attachments investigated herein included flange gussets, web gussets, vertical stiffeners, and cover plates. The fatigue cracks initiated at the longitudinal end of joint area of the weld bead and the parent metal where stress was significantly concentrated. The initiated fatigue cracks developed along the weld path and then, propagated to the parent metal in the direction perpendicular to the principal stress. The fatigue cracks developed even under a compressive stress when a significant residual stress was experienced from the welding. The fatigue strengths of the each welded attachment were evaluated and compared with the current fatigue design specifications in AASHTO [1] and JSSC [2].

scholarly journals Performance of Corroding Steel Structure over Time

2020 ◽  
Vol 5 (7) ◽  
pp. 10
Author(s):  
Swati Tikone ◽  
Priyanka Desai ◽  
Karnika Jadhav ◽  
Jayendra Bhosale ◽  
Manjunath M ◽  
...  
Keyword(s):  
Steel Structure ◽  
Over Time

On the Quantification of Robustness of Structures

2006 ◽  
Author(s):  
Michael H. Faber ◽  
Marc A. Maes ◽  
Daniel Straub ◽  
Jack Baker
Keyword(s):  
Service Life ◽  
Fatigue Damage ◽  
Steel Structure ◽  
Steel Structures ◽  
Risk Assessments ◽  
Structural Systems ◽  
Engineering Systems ◽  
Type Steel ◽  
Damage And Failure ◽  
Generic Framework

The paper first reviews different interpretations of robustness. On this basis objectives facilitating the quantification of robustness of engineering systems are formulated. Thereafter a generic framework for risk assessments of engineering systems is presented in which robustness is related to the ability of the system to sustain damages. This framework is then applied to quantify robustness of structural systems and to develop a robustness index facilitating a consistent ranking of structures according to their robustness. The proposed approach to the assessment of robustness principally takes into account the effect of redundancy, ductility, damage and failure consequences as well as strategies for condition control and intervention during the service life of structures. Finally, a simple example illustrates the use of the framework for the assessment of the robustness of a jacket steel structure subject to fatigue damage. The example shows that presently used indicators for the robustness of jacket type steel structures such as the RIF only capture part of the picture and illustrates the merits of a risk based framework for robustness assessments.

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