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re: P-delta effects[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: re: P-delta effects
- From: "Ron O. Hamburger" <ROH(--nospam--at)eqe.com>
- Date: Wed, 13 Dec 2000 20:16:59 -0800
ON 12/13 - Ghassem Khosrownia wrote: "I am looking at FEMA 302 requirements for P-Delta analysis and somehow it is not making sense to me. Section 188.8.131.52 states that when the stability factor of a structure is below 0.1, then P-delta effects may be ignored. Same section places an upper limit on stability factor of 0.25. However, if beta is taken conservatively as 1.0, as suggested, and Deflection Magnification Factor of 5 is used for Special Concentric Braced Frames, then the upper limit is computed to 0.10. Does this mean that if SCBF is used" _____________________ Ghassem - that is exactly what it means. P-delta effects are normally significant only for flexible structures like moment frames, not braced frames or shear wall structures.
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