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shear strength of WF
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- Subject: shear strength of WF
- From: Roger Turk <73527.1356(--nospam--at)compuserve.com>
- Date: Thu, 2 Nov 2000 23:02:55 -0500
Mark, Unlike shear strength in the strong direction where the shear strength is simply V = (Tau)*d*t(w), or the shear stress, Tau = V/d*t(w), shear in the weak direction is the same as shear on two rectangular elements, Tau(max) = 1.5*V/2*b(f)*t(f). The reason that we can take the shear stress as uniform across the depth of a WF section in the strong direction is because of the flexural shear formula, Tau = V*Q/I*b Shear stress is very low in the flanges because "b" is very large, but when you get to the web, "b" suddenly becomes small, and the shear stress becomes very large, and remains almost the same for the depth of the web, then suddenly becomes small again at the other flange. We do not have the luxury of that simplicity for shear in the weak direction, i.e., parallel to the flanges. Hope this helps. A. Roger Turk, P.E. (Structural) Tucson, Arizona Mark Pemberton wrote: >>Can anyone direct me to useful provisions for the shear strength of a wide flange beam in weak direction loading? (The key word in this sentence is "useful" - the AISC ASD & LRFD manuals do not seem to address this issue in a usable manor)<<
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