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RE: Shear Flow

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For what it's worth, I believe there is significant anecdotal evidence that
this type of reinforcement is ineffective, regardless of the supporting
calculations. To verify this, I suggest you contact an expert in the area of
GLB repair, Bob Powell. The last known address I have for Bob is as follows:

10780 Santa Monica Blvd.
Santa Monica, CA 90025
(310) 446-5550


Bill Allen, S.E. (CA #2607)
Laguna Niguel, CA

||-----Original Message-----
||From: Brad F [mailto:brad(--nospam--at)]
||Sent: Thursday, March 23, 2000 9:06 PM
||To: seaint(--nospam--at)
||Subject: RE: Shear Flow
||-----Original Message-----
||From: Greg Smith [mailto:strusup(--nospam--at)]
||Sent: Monday, February 14, 2000 11:46 AM
||To: seaint(--nospam--at)
||Subject: Re: Shear Flow
||Use QV/Ib where b is the width of the glulam.
||-----Original Message-----
||From: Gobo, Gina <ggobo(--nospam--at)>
||To: 'seaint' <seaint(--nospam--at)>
||Date: Monday, February 14, 2000 1:45 PM
||Subject: Shear Flow
||>I have question about composite beams:
||>I have a wood glulam beam that I would like to reinforce by
||adding a steel
||>channel to both sides. I am trying to find the shear flow at
||the channel to
||>wd beam contact area so that I may figure our how many bolts
||I need to
||>faster the composite beam together. I am using the formula f
||= QV/I, where
||>is the maximum shear load on the beam, I is the moment of
||inertia for the
||>composite section, and Q the first moment of inertia of the
||glulam beam
||>is in contact with the channel = yA where, y is the distance from the
||>centroid of the block of wd in contact with the channels to
||the neutral
||>and A is the area of the same block of wd. If I am using a
||channel that is
||>C12X20.7 and a 6.75X31.5 glulam, Q = ((12/2)-dist to neutral
||axis of entire
||>section)*6.75*12=248in3. I = 17964.83 in4 and V = 48kips. f
||= 8kip/ft which
||>seems very high.
||>The shear flow that I get seems very high. Do I have to use
||the transformed
||>section in order to get the shear flow? (i.e. transform the
||wd beam into an
||>equivalent steel member in order to get the correct shear
||flow). Or, is
||>using I of the composite section based on the geometry of
||the cross section
||>Gina T. Gobo, E.I.T.
||>Structural Engineering
||>DLR Group
||>Ph. 206.461.6000
||>Fax 206.461.6049