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Re: Hooks on bottom reinforcing steel in pile caps

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In my experience when you have large bars, you also
have a pile cap that's deep enough to accomodate a 90
degree hook.

A bigger problem with these large bars (in my opinion)
is installing intersecting bars with 180 degree hooks.
This may be easy to do on paper, but if your're
standing near a rodsetter while he's trying to install
the bars, don't tell him you designed the reinforcing
steel. 

Cliff Schwinger


--- "S. Gordin" <scgordin(--nospam--at)hotmail.com> wrote:

> In my experience, the longitudinal rebars in drilled
> piles are quite heavy, usually, #8, due to just the
> formal requirements of the code.  In such case, the
> 90-deg bents may become quite large, like, 16 inches
> minimum off the edge of the pile.  As a result, the
> 90-deg bents simply do not fit into the pile cap
> with the size predetermined or limited by other
> factors.
> 
> Steve Gordin
>     
>   ----- Original Message ----- 
>   From: Michael Bryson 
>   To: seaint(--nospam--at)seaint.org 
>   Sent: Friday, November 05, 2004 8:39 AM
>   Subject: RE: Hooks on bottom reinforcing steel in
> pile caps
> 
> 
>   90 degree hooks accomplish the same thing.
> 
> 
>   -----Original Message-----
>   From: Stuart, Matthew
> [mailto:mstuart(--nospam--at)schoordepalma.com] 
>   Sent: Friday, November 05, 2004 8:23 AM
>   To: seaint(--nospam--at)seaint.org
>   Subject: RE: Hooks on bottom reinforcing steel in
> pile caps
> 
>   Per CRSI:
> 
>   "The provision for 180 degree end hooks on all
> bars in pile caps with
>   single lines of piles around the column is a
> prudent precaution against
>   premature tied arch shear failure" 
> 
>   Matthew Stuart
>   Structural Dept. - Manalapan
>   732-577-9889 x1283
> 
> 
>   -----Original Message-----
>   From: Cliff Schwinger
> [mailto:clifford234(--nospam--at)yahoo.com]
>   Sent: Friday, November 05, 2004 9:59 AM
>   To: seaint(--nospam--at)seaint.org
>   Subject: Hooks on bottom reinforcing steel in pile
> caps
> 
>   Does anyone know why the CRSI handbook shows 180
>   degree hooks on the bottom reinforcing steel in
> pile
>   caps? Why not just use 90 degree hooks. Bars with
> 90
>   hooks are less expensive to fabricate and easier
> to
>   install (especially where hooks hit hooks in the
>   corners of the pile caps).
> 
>   The strength and development length of 90 degree
> and
>   180 degree hooks are identical. As far as I'm
>   concerned, either hook type could be used in the
>   bottom bars in pile caps.
> 
>   Am I missing something?
> 
>   TIA,
> 
>   Cliff Schwinger
> 
> 
> 
>                  
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