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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: "Ron Hamburger" <ROH(--nospam--at)eqe.com>
- Date: Sat, 23 Mar 1996 14:08:50 PST
- Priority: normal
On March 23, 1996, Henry Huang wrote: > 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? > This is a confusing point as some mills utilize a differt proecedure for reporting yield strength than do others. There are two common methods, both permissible by ASTM. One is to report the yeild strength. This is defined as the stress recorded at a specific elongation. The other method is to report the yield point. This is the little peak in the stress strain curve, before the yield plateau, which is higher. Also, the mills test their coupons at a very high strain rate - resulting in a somewhat elevated reported stress for both yield point and yield stress. If you are using the mill cert values, you should ask the mill what practice they follow and what they are reporting. The yield stress, not yield point is the desired value. Also, if the lab pulled the coupon at a slower strain rate, this is more applicable to seismic loading conditions. Note that SAC is attempting to come up with specific recommendations for the industry on how to take and report mill cert data as part of our phase II effort, currently underway. Regards, Ron Hamburger Project Director for Product Development SAC Steel Project Ronald O. Hamburger, SE Regional Manager EQE International, Inc. San Francisco, California ...
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