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shear strength of WF

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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 

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)<<