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RE: Effect of Volume Factor for Glulam Cantilever

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No, you can’t just look at the cantilever portion, like you said, it is between the points of zero moment.  The cantilever is not independent of the rest of the beam and neither is the volume factor.  Breyer’s wood book has a good example problem dealing with this.  It would be conservative to use the full back span length of the beam.  Discounting the 21/L portion may result in an unconservative answer.


Ted Ryan


-----Original Message-----
From: Hansen * Hokama, Structural Engineers [mailto:hchansen(--nospam--at)]
Sent: Monday, December 20, 2004 8:12 AM
To: seaint(--nospam--at)
Subject: Effect of Volume Factor for Glulam Cantilever


Does anyone know what is the appropriate length (L) to use when calculating the volume factor for just the cantilever portion of a double cantilevered glulam beam?  The AITC Timber Construction Manual states that (L) is the "length of bending member between points of zero moment" so, for example, when adjusting the allowable stresses for a 6'-0" cant. can you discount the 21/L portion of the volume factor?


Mike H.