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Re: [SEAOC] Yield strength of structural steel shapes[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: [SEAOC] Yield strength of structural steel shapes
- From: chrisw(--nospam--at)skypoint.com (Christopher Wright)
- Date: Sat, 23 Mar 1996 10:39:46 -0600
>It appears that there is a difference of yield strength for structural steel >(Fy) between Mill Cert and results of lab coupon tests. Anybody know if >there are test data showing the relationship between the two? Which number >do you suggest for evaluation the capacity of an existing structure? Presumably the mill certs refer to an ASTM standard. The ASTM standard provides minimum acceptable properties for compliance with the standard. Actual data may exceed the minimum by 10% or 15%, sometimes more. Constructional steel supplied to a more restrictive standard (higher mechanical properties) may be sold as conforming to a less restrictive standard, provided all the chemical and meahanical ranges are met. The actual difference is a statistical thing. Sometimes mill certs are simply certificates of compliance stating that the material is warranted to meet the minimums specified by the applicable ASTM standard. In that case your labs tests will always exceed the certs, provided the material conforms. If your lab tests show less than the ASTM standard, you have non-conforming material, and your structure may be in technical violation of regulatory or contract requirements. If your lab tests show greater than the ASTM standard, use the ASTM properties for evaluation, since you don't know whether your test results apply to all the steel of the structure. In any event use the minimum of the ASTM standard or the lab tests, and report any non-conformance to your client. Christopher Wright P.E. |"They couldn't hit an elephant from chrisw(--nospam--at)skypoint.com | this dist--" (last words of Gen. Voice phone (612)933-6182 | John Sedgwick, Spotsylvania 1864) ...
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