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Re: Shear Flow
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- Subject: Re: Shear Flow
- From: "Greg Smith" <strusup(--nospam--at)gte.net>
- Date: Mon, 14 Feb 2000 13:46:29 -0600
Use QV/Ib where b is the width of the glulam. Greg -----Original Message----- From: Gobo, Gina <ggobo(--nospam--at)DLRGROUP.com> To: 'seaint' <seaint(--nospam--at)seaint.org> 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 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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