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Re: FRP reinforcement
- To: <seaint(--nospam--at)seaint.org>
- Subject: Re: FRP reinforcement
- From: "Dave Handy" <dhandy(--nospam--at)trg.ca>
- Date: Tue, 31 Oct 2006 09:46:57 -0500
I was referring to CFRP actually (Carbon Fibre). I
agree with the EI comment. I don't think it will accomplish the required
stiffenning however a slight increase will be obtained because they are
installed on the exterior surfaces of the slab and get the additional lever arm
from the concrete cover thickness.
Anybody want to tackle the question about the
amount of slab jacking..or the installation of drop panels in an existing slab?
BTW there are several floors above the level of concern that will not be
----- Original Message -----
Sent: Monday, October 30, 2006 10:28
Subject: RE: FRP reinforcement
What is the
To me FRPC is Fibre
Reinforced Polymer Composite. Glass fibres are stiffer than steel, whilst
Kevlar fibres are tougher than steel, not sure where carbon fibres lie. The
articles I have read on FRPC have generally concerned using FRPC sheets to
strengthen reinforced concrete bridges, either wrapped around columns or
applied to sides of beams. Purposes being to either repair damaged concrete,
allow for increased traffic loading, or meet earthquake
Not sure how FRPC
would help reduce deflection of a slender slab. Need to increase EI, and I
don?t believe it will have much effect on that!
Has anyone used FRP reinforcement
to strengthen existing structural slabs. I am dealing with a slab with a
significant deflection (3"+/-) and it is about 15 years old. I am concerned
about the amount of jacking that could be done prior to the installation of
the FRP. I am thinking that we could only jack the slab back up by the amount
of the "immediate DL deflection" which could be only about a 1/4 or 1/3 of the
long term DL deflection. Any thoughts on procedures? I am also not sure
that this is the answer to the problem; it was the suggested method.
I seemed to remember reading that the stiffness is not increased as much
as the strength is. Is there any way to get the slab back to level condition
without the use of toppings?
I also have other concerns about
the strength as the area where there is a problem is the area where there are
no drop panels. Has anyone on the list ever added drops to an existing slab. I
am mulling over what kind of connection/joint there would have to be between
the new and the old.