<p>The present study illustrates the fatigue behaviour with the presence of welding residual stress for an orthotropic steel deck bridge subjected to a range of traffic loads. The fatigue estimation methodology adopted integrates the concept of fracture mechanics with rainflow counting. Numerical models in commercially available finite element software along with rainflow counting algorithm as per ASTM standards are explicitly developed. Fatigue failure due to welding residual stresses has been reported extensively in the literature, so its evaluation would facilitate understanding the distribution and determining the stress concentrations essential in designing OSD bridge structures. The existing Mingzhu Bay bridge is considered to understand its behaviour under various traffic loads. The results emphasize the need to consider residual stress effects while evaluating the fatigue life of OSD bridges. Results showed that the initial fatigue life of concern points decreased significantly with welding residual stresses, with the fatigue life of OSD dropping from <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13296_2025_964_Article_IEq1.gif" Format="GIF" Height="18" Rendition="HTML" Resolution="72" Type="Linedraw" Width="65" /> </InlineMediaObject> <EquationSource Format="TEX">$4.6\times {10}^{6}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>4.6</mn> <mo>×</mo> <msup> <mrow> <mn>10</mn> </mrow> <mn>6</mn> </msup> </mrow> </math></EquationSource> </InlineEquation> cycles to <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13296_2025_964_Article_IEq2.gif" Format="GIF" Height="18" Rendition="HTML" Resolution="72" Type="Linedraw" Width="65" /> </InlineMediaObject> <EquationSource Format="TEX">$1.0\times {10}^{3}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>1.0</mn> <mo>×</mo> <msup> <mrow> <mn>10</mn> </mrow> <mn>3</mn> </msup> </mrow> </math></EquationSource> </InlineEquation> cycles for an initial crack length of 0.1 mm.</p>

Influence of Residual Stresses on the Fatigue Behaviour of an Orthotropic Steel Deck Using Fracture Mechanics Approach

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发表日期：

2025年5月24日

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Aditya Manoj Thakre,
Arindom Bora,
Debabrata Podder

摘要

The present study illustrates the fatigue behaviour with the presence of welding residual stress for an orthotropic steel deck bridge subjected to a range of traffic loads. The fatigue estimation methodology adopted integrates the concept of fracture mechanics with rainflow counting. Numerical models in commercially available finite element software along with rainflow counting algorithm as per ASTM standards are explicitly developed. Fatigue failure due to welding residual stresses has been reported extensively in the literature, so its evaluation would facilitate understanding the distribution and determining the stress concentrations essential in designing OSD bridge structures. The existing Mingzhu Bay bridge is considered to understand its behaviour under various traffic loads. The results emphasize the need to consider residual stress effects while evaluating the fatigue life of OSD bridges. Results showed that the initial fatigue life of concern points decreased significantly with welding residual stresses, with the fatigue life of OSD dropping from $4.6\times {10}^{6}$ $4.6 \times 10^{6}$ cycles to $1.0\times {10}^{3}$ $1.0 \times 10^{3}$ cycles for an initial crack length of 0.1 mm.