Creating a Continuous Wood Beam by Sistering
Creating a Continuous Wood Beam by Sistering
(OP)
I want to design a very long continuous wood beam for use as main girder of a 80' long pier structure. There will be two girders with floor beams spanning between the girders. I want to sister 3x10's that are 20'long and alternate splices at 1/4 points of 20' spans. I would like to know how to design the bolt pattern and spacing connecting the two sistered 3x10's. Is it just the shear in the beam that the bolts need to transfer? The shear flow equation VQ/I doesn't make sense to me in this instance since the two 3x10's have the same neutral axis. Also, i would like to design a cover plate bolted through the 3x10's at the splice of each 3x10 to handle the additional moment and shear that the continuous 3x10 alone can not handle at the 1/4 point. Any help is appreciated.
RE: Creating a Continuous Wood Beam by Sistering
I am assuming you want to create an 80' long continous beam with supports every 20'. Why not use treated Southern Pine glulams 6 3/4" x 9 5/8" with no camber spanning 20'? You might even be able to use 40' long glulams. I think though that at 40' that small of glulam might be too flexible out of plane to produce and handle.
With the Southern Pine you could use 26F-V4 material with 2600 Fb. top and bottom.
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RE: Creating a Continuous Wood Beam by Sistering
RE: Creating a Continuous Wood Beam by Sistering
So, rather than continuing there, take a look at page 47 of the TECO Catalog for the spike connectors you mentioned, might work for your application. Here is the link
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Also see the TECO Design Manual at
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RE: Creating a Continuous Wood Beam by Sistering
RE: Creating a Continuous Wood Beam by Sistering
RE: Creating a Continuous Wood Beam by Sistering
ACQ, CA, Borate Compounds, CCA, and Oil Based Preservatives (like as Creosote).
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