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Shear Flow
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- Subject: Shear Flow
- From: "Gobo, Gina" <ggobo(--nospam--at)DLRGROUP.com>
- Date: Mon, 14 Feb 2000 13:42:59 -0600
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 V 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 that 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 axis and A is the area of the same block of wd. If I am using a channel that is a 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 ok? Gina T. Gobo, E.I.T. Structural Engineering DLR Group Seattle Ph. 206.461.6000 Fax 206.461.6049 ggobo(--nospam--at)dlrgroup.com
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