members and use the effective elastic properties (EI) to determine
loadsharing fractions. In a typical floor system, though, there is a
3/4" top "flange" which gets carefully ignored in determining the
performance if the system. By utilizing a sufficient shear interface at
the subfloor-Ijoist interface, and verifying that the shear capacity at
the web-flange interface is sufficient, the addition of a tensile
material on the bottom chord with the proper shear transfer mechanism
would utilize more of the existing material. If the application of the
FRP is relatively simple and durable, this could seriously reduce
structural cost of the in place retrofit.
I would be concerned about the (1) shear transfer mechanism between the
wood and FRP over a long period and (2) the maximum shear allowable at
the web-flange interface. I hope we'll find out the results of the design.
Jordan
Drew Morris wrote:
> I don't see how strengthening the bottom chord alone will work. Don't
> you have to look at the connections of the web members to the chords
> and how the chords are spliced if not continuous? You may be able to
> make the joist into a plywood box beam by adding plywood to each side
> of the joist and adding a metal strap along the bottom chord. Also,
> can you add or sister in new joists?
>
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