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# RE: CONC-Design of Underground manholes/tanks

• To: "'seaoc(--nospam--at)seaoc.org'" <seaoc(--nospam--at)seaoc.org>
• Subject: RE: CONC-Design of Underground manholes/tanks
• From: "Horning, Dick/CVO" <dhorning(--nospam--at)CH2M.com>
• Date: Tue, 9 Sep 1997 09:32:36 -0600

```Visual Analysis by Integrated Engineering Software is getting close,
they either have already or will soon release a version which does
concrete slab/wall design.  You can contact them at 406-586-8988 or
http://www.iesweb.com.  PCA has recently published a book of charts
titled "Rectangular Concrete Tanks" for tank wall analysis.  Don't
discount your references from the '50's, the coefficients for moments
and shears are still valid today.

> ----------
> From:
> Lawrence_Smith%URSGREINER(--nospam--at)ursgreiner.com[SMTP:Lawrence_Smith%URSGREINE
> R(--nospam--at)ursgreiner.com]
> Sent: 	Tuesday, September 09, 1997 5:34 AM
> To: 	seaoc(--nospam--at)seaoc.org
> Subject: 	CONC-Design of Undeground manholes/tanks
>
>
> I was wondering if anyone knew of any references or computer programs
> which
> detail and/or simplify design of underground rectangular/circular
> concrete
> manholes/tanks.
>
> Currently, we design these one of two ways and both have
>
> 1. We use STAAD III and perform a finite element analysis  and have
> the
> tank walls, bottom and top slabs broken into a number of elements.
> The
> output, however, is very large, (40+ pages for a 12'X12' tank just to
> get
> design moments and shears).
>
> 2. We use tables to obtain design coefficients. This method works OK
> but is
> tedious and time consuming, not to mention that the tables are from
> the
> 1950's, and I would like to think there have been some design method
> imporvements since then.
>
> So.... if anyone knows of a better method, please let me know where to
> look.  My 'pipe dream' is to find a program that just asks for
> geometry,
> soil parameters, and loads, and then "spits" out the rebar for the
> tank.
>