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Re: strengthening of floor joists with FRP's??

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Dolly,
 
        How about adding some "Bow String" joists?  You should be able to build these in place about every third TJW and connect them together with heavy bridging to create a load sharing system.
 
        Just a thought.
 
Regards,
 
H. Daryl Richardson
----- Original Message -----
Sent: Saturday, June 02, 2007 12:45 AM
Subject: strengthening of floor joists with FRP's??

I have a project where we'd like to strengthen the existing open web floor joists (TJW) due to change of occupancy use.  Loads have increased from 50 psf live +20 psf partition to 100 psf live with no partition loading.

Has anyone ever strengthened these types of joists using FRP's adhered to the bottom chord only?? Is this even a possiblity, considering the different materials (i.e. wood chords, steel web members, steel pins) used in the joists? Presence of piping/ducting running through the web spaces precludes the use of sheathing the sides of the joists with plywood, which was my first thought.  Any other suggestions??  Thanks


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