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RE: Glulam Beam Retrofit

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I have designed reinforced GLB’s with steel channels to act compositely i.e. share the load. This can be more economical than designing a channel to span the entire length of the GLB. The drawback is that the thru-bolt connections can get rather heavy.


The Wood Engineering & Construction Handbook has a section on composite beam design. Mathematically it looks quite accurate.


-----Original Message-----
From: Bill Allen, S.E. [mailto:T.W.Allen(--nospam--at)]
Wednesday, December 15, 2004 8:11 AM
To: seaint(--nospam--at)
Subject: RE: Glulam Beam Retrofit


What I have done in the past is either use two steel channels (one each side of the GLB) connected to the GLB with through bolts. I have designed the steel channels to take 100% of the load, using the existing GLB as a mechanism to transfer the load to the steel channels. What’s critical with this approach is that the steel channels must be connected to the existing support in some manner.


Alternatively, I have hired Bob Powell (805) 486-2670 in the past as a consultant who provides a retrofit design using a post tensioning approach.


What I won’t do is bolt a steel member to the existing GLB and expect some sort of load sharing to occur. This mechanism is not nearly as mathematically accurate as say welding a cover plate on a steel beam with regards to estimating the load distribution.


If you would like more information about Bob Powell, you can e-mail me privately.




T. William (Bill) Allen, S.E. (CA #2607)


Consulting Structural Engineers

V (949) 248-8588

F (949) 209-2509


-----Original Message-----
From: Eknrinc(--nospam--at) [mailto:Eknrinc(--nospam--at)]
Wednesday, December 15, 2004 1:39 AM
To: seaint(--nospam--at)
Subject: Glulam Beam Retrofit


I have a glulam beam overstressed in flexure. Anyone have any great retrofit ideas?