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Re: Shear Flow
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- Subject: Re: Shear Flow
- From: "Chris Towne" <ctowne(--nospam--at)chaptech.com>
- Date: Mon, 14 Feb 2000 15:02:41 -0500
"For a beam made of two or more materials with different moduli of elasticity, show that Equation T=VQ/It remains valid provided that both Q and I are computed using the transformed section of the beam and provided that t is the actual width of the beam at the point where T is computed." >From Beer and Johnton's Mechanics of Materials, Second Edition, McGraw-Hill, Inc. 1992, page 305 Chris Towne, E.I.T. Chapman Technical Group ----- Original Message ----- From: "Gobo, Gina" <ggobo(--nospam--at)DLRGROUP.com> To: "'seaint'" <seaint(--nospam--at)seaint.org> Sent: Monday, February 14, 2000 2:42 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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- From: Gobo, Gina
- Shear Flow
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