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

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Try Google, there is a good bit of discussion about it. Why would you ever put 2 materials that even have the potential to corrode in contact?

"In the case of carbon FRP, the likelihood of galvanic corrosion due to steel-carbon fiber contact is also a concern."


On 6/2/07, Robert Kazanjy <rkazanjy(--nospam--at)> wrote:
Additonally one needs an electrolyte for galvanic corrosion (one of the best is of course sea water but any water will do)

Except for plumbing systems or exterior applications, it seems ot me that the conditions for galvanic corrosion do not exist in a building system (like a floor joists)


On 6/2/07, Robert Kazanjy < rkazanjy(--nospam--at)> wrote:
Sorry to be so persistent but do you have soruce or reference for this concern?


On 6/2/07, Will Haynes < gtg740p(--nospam--at)> wrote:
Galvanic corrosion.


On 6/2/07, Robert Kazanjy < rkazanjy(--nospam--at)> wrote:

>>>>If you are using carbon FRP, I know it cannot be in contact with any of the steel.<<<<

Could you expalin further this prohibition?


On 6/2/07, Will Haynes <gtg740p(--nospam--at)> wrote:
What FRP are you using? If you are using carbon FRP, I know it cannot be in contact with any of the steel.

Will H.

On 6/2/07, DOLLY TRIVIZ < dktriviz(--nospam--at)> wrote:

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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