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Currently, I have an actual entire corroded bridge model in the FEM analysis in Abaqus I want to estimate the residual strength of this bridge due to corrosion from the output results in the Abaqus, I can have stress and strain values

but I was wondering how to calculate the residual strength of this corroded bridge,? is there any possibility to derive an equation to estimate the residual strength of this bridge using the results from Abaqus model?

thank you very much in advance

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  • $\begingroup$ Get the output results to include the actual size of the corroded elements ie reduced area etc and use those for the input to the equation. $\endgroup$
    – Solar Mike
    Jul 28, 2018 at 11:40
  • $\begingroup$ I was wondering is it okay to just make a simple relationship between the stress value from corroded structure to the yield strength of steel? $\endgroup$
    – Cindy.Karina9
    Jul 28, 2018 at 11:46
  • $\begingroup$ Run the results and find out - hopefully you will get the correct answer before the real bridge drops people in the river... $\endgroup$
    – Solar Mike
    Jul 28, 2018 at 11:48
  • $\begingroup$ lol. the bridge already collapsed long years ago, but I used the data for my dissertation project to estimate residual strength of corroded bridge $\endgroup$
    – Cindy.Karina9
    Jul 28, 2018 at 11:49
  • $\begingroup$ Then why not look for a correlation between years and corrosion - perhaps applied after 3 years or 5 years and also a painting quality adjustment,,, $\endgroup$
    – Solar Mike
    Jul 28, 2018 at 11:56

1 Answer 1

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The strength of the steel has not changed unless there is some factor you have not mentioned. You can get a good estimate of the remaining strength of the structure by putting in the minimum remaining thickness of the various sections into the program. This technique is accepted by AGA ( American Gas Association) , and I think ASME or ANSI, for determining the remaining strength of corroded line pipe. That is , if the original crossection area was 5 sq. in. and corrosion has removed 1 sq. in. of steel in the most corroded point of that member ; The strength of that member is reduced by 20 %.

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  • $\begingroup$ +1. As one of this site's top users in the Abaqus tag, I wonder if you've seen this question and/or if you might know the answer to it? mattermodeling.stackexchange.com/q/2055/5 $\endgroup$
    – Nike Dattani
    Nov 14, 2020 at 3:38
  • $\begingroup$ I haven't thought about crystal plasticity since college ( many decades ago). $\endgroup$
    – blacksmith37
    Nov 14, 2020 at 17:00

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