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Re: Drift at top and rotation/curvature[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Drift at top and rotation/curvature
- From: james korff pe pmp <seaoc(--nospam--at)yahoo.com>
- Date: Fri, 30 Jul 1999 14:36:14 -0700 (PDT)
Thank you all for your preseient comments. I believe we have now reached the phase in this thread of Paralysis by Analysis. This is why I love struct-eng: Elasto-plastic Semi-rigid Quasi-static Pseudo-dynamic Non-ductile Effective Stiffness Nominal Strength Pseudo-Loading et al Looking back at my original posting, Drift vs Rotation is apparently an OXYMORON. There is no such relationship. Plastic Hinge Rotation occurs when the inelastic response is flexure dominated. Drift occurs when the inelastic response is controlled by Shear. UNLESS of course we consider the RC Column as a pseudo-inverted-quasi-coupling beam, in which case the operative, irrespective of what governs the inelastic response (flexure or shear), is chord rotation. And chord rotation = delta / length. How simple!! jgk --- Ed Workman <eworkman(--nospam--at)fix.net> wrote: > You are confusing design of the primary lateral load resisting system > with > compatibility drift. > It is not necessary or even possible to assure strong column/less > strong > beam action in the "gravity" system. It is necessary to assure that > collapse > of these elements will not occur. > === James Korff, PE, PMP Structural Composite Consultants 985 E. Hillsdale Blvd, Suite 128, Foster City, CA 94404 Phone 650-796-8997 / Fax 650-345-1355 "May the DISPLACEMENT be With You !!" _____________________________________________________________ Do You Yahoo!? Free instant messaging and more at http://messenger.yahoo.com
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