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Re: [SEAOC] Concrete Dilema[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: [SEAOC] Concrete Dilema
- From: AMLAN(--nospam--at)novell.civil.umr.edu
- Date: 13 Apr 96 19:21:09 CDT
The method of the Working Stress Design assumes both the materials, steel and concrete, to be linear elastic. This is applicable for serviceability checks. The method of the Ultimate Strength Design considers the state of failure of an under-reinforced beam. The steel has yielded and hence it is no more linear elastic. The concrete has reached the ultimate strain of 0.003 and its stress- strain curve cannot be approximated by a linear elastic relationship. The Whitney's stress block is commonly used, for simplification, to substitute the actual stress- strain curve at failure. The expression is thus applicable at failure of an under-reinforced beam only. -- Amlan K. Sengupta Dept. of Civil Engg. University of Missouri-Rolla ...
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