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Re: STR. DESIGN OF BURIED STRUCTURE

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Please note that due to rigid corner walls, soil arching develops. The
amount of lateral forces(ko) s onto the short span of the wall will be
reduced. But even then, using the code, I find that shear in walls are
always a problem in buried structures.

K.Hong


>From: robert.rogers(--nospam--at)woolpert.com
>Reply-To: seaint(--nospam--at)seaint.org
>To: SEAINT(--nospam--at)SEAINT.ORG
>Subject: STR. DESIGN OF BURIED STRUCTURE
>Date: Mon, 19 Apr 99 08:35:37 EST
>
>          I am seeking some comments with regard to the design of a 
>          deep wet well which will contain a submersible pump to 
>          discharge storm water.  The structure will be a square box 
>          (4' x 4' interior dimensions) that extends from the ground 
>          surface to a depth of 32 ft. below grade.  The structure 
>          will be reinforced concrete and is subject to an equivalent 
>          lateral pressure of 100 lbs/ft^3 (i.e. lateral pressure = 
>          100 * depth).  Utilizing PCA's "Rectangular Concrete Tanks 
>          Book", and with ACI 350 in mind, I'm getting a wall 
>          thickness at the bottom of the structure in the
neighborhood 
>          of 22" thick (shear design controlling).  The client thinks 
>          this is ridiculous and we're over-designing.  They also say 
>          they have never seen anything over 18" thick and usually 
>          it's 12" thick.
>          
>          What typical wall thickness have others arrived at for
these 
>          types of buried structures ?
>          
>          We are not utilizing shear reinforcing in the corner of the 
>          tank to handle shear (only the concrete's ability to take 
>          the shear).  We are thinking it will be easier to construct 
>          with minimal rebar and more concrete.  Any different 
>          philosophies out there ?
>          
>          Thanks in advance for any help.
>          
>
>
>


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