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RE: [MW:4942] Corroded Beams (AISC)

By Materials & Welding
1. Consult a Structural Engineer
2. Measure the minimum thickness, and calculate the section modulus of the
cross section.
3. Using the AISC code calculate the required section modulus requires for
the loading conditions.
4. Compare the two values, the beam's Section Modulus must be greater than
the required Section Modulus.

Note, the thickness of the web has only a slight affect on the Section
Modulus when compared to the Flange thickness

If the section modulus is too low you can increase it by adding scab plates
to the beam, Once again I must mention consult with a Structural Engineer.

Best Regards,
Richard M. Beldyk PhD, PE, CWEng

Original Message:
-----------------
From: omar fazni ofazni@yahoo.com
Date: Thu, 22 Apr 2010 17:38:37 -0700 (PDT)
To: materials-welding@googlegroups.com
Subject: [MW:4930] Corroded Beams (AISC)


Dear Members,

Does anyone has any experience of determining the tolerance of thickness
reduction of a corroded beam (surface attack) with AISC code??

What happens is we have a W18x50 beam that is corroded all over one side of
the web surface, after performing sandblast on the beam surface we found
that the roughness is very high and already look like there are a lot of
small pits.....

Using weld gauge after sandblasting the beam, we can measure some pits have
reduced its thickness by more than 10%, about 1mm

Any response or shares will be appreciated

Tq & Regards
Omar Fazni

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