Sistering existing Wood beam with Steel
Sistering existing Wood beam with Steel
(OP)
I'm removing a support post and wish to sister an existing 6 x 8" wood beam with steel angle. I'm considering thru-bolting the joist to connect the steel angle. Can anyone advise me on how to calculate or practicaly determine the frequency and diameter of the hardware for the thru-bolting? It a 14' span with a 30psf DL and 40 psf LL.
Best regards,
Instance
Best regards,
Instance






RE: Sistering existing Wood beam with Steel
Approach the design to allow the plate to carry the amount of load equivalent to the removal of the column and increasing the span (the former column reaction). Then check deflection. If deflection is more than L/360, add more plate section. Check differential shear between the wood alone and the steel plates alone carrying the same load. Use factor of safety of at least 4 and this will be the size of your thru-bolts to bolt the plates to the wood. Check wood bearing on the bolts and increase size if necessary to cover compression in the wood, plus creep.
Other techniques are used as well. Check structural texts for flitch plate design.
RE: Sistering existing Wood beam with Steel
http://www.destefanoassociates.com/tech/flitch.pdf
RE: Sistering existing Wood beam with Steel
Thanks everyone.
-Mark