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RE: Concrete Bench With Wall

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Tarek,

Thank you for this tip.  I was using a hook development length table from an
ACI design manual.  It didn't reference additional information.  Its' good
to know.

Rich


-----Original Message-----
From: Tarek Mokhtar [mailto:Tarekmokhtar(--nospam--at)earthlink.net] 
Sent: Thursday, February 26, 2009 11:16 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: Concrete Bench With Wall

Rich,

You can reduce the developemnt length of the hooked #4 bar by the 
side cover factor(.7)
and excess reinforcemnt. with the minimum being 6". look at ACI 12.5

Tarek Mokhtar, SE
Laguna Beach, Ca





>I've been asked to design a retaining wall with a built-in bench.  The wall
>retains about 6 feet of soil.  The bench wants to be on the low side of the
>wall.  The architect would like to cantilever the bench out from the face
>of wall.
>
>I'm looking at this two ways. One way would be to form the seat with the
>wall and pour it together monolithic.  I haven't done ornamental type work.
>  I see this as a real pain to form the wall and seat together.  Also, the
>seat would need a top surface form and the question I have is how to assure
>the seat part of the formwork was filled sufficiently with concrete while
>pouring.  I thought about putting a construction joint in the wall at the
>top of the seat elevation.  I don't like the idea of two separate pours.
>Any ideas as to how to detail a monolithic seat and wall?
>
>My other though is to pour the wall separate and then pour the seat.  This
>is back to 2 pours.  The challenge I see is how to develop the bars
>sticking out for the seat.  I need full moment capacity but I do not have
>enough wall to develop the bar by the time it reaches the face of wall.
>Any ideas as to how to get a full bar developed in the wall?  If there was
>no bench I could use an 8" thick wall.  I could justify going to 12" thick
>if I needed it. This still doesn't develop a hooked #4 bar with adequate
>cover.
>
>Thanks for your insight.
>
>Rich
>
>
>
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