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# RE: Clay/brick smokestacks

• To: <seaint(--nospam--at)seaint.org>
• Subject: RE: Clay/brick smokestacks
• From: "Deborah Goodacre" <dgoodacre(--nospam--at)csijobs.com>
• Date: Wed, 17 Feb 1999 17:13:22 -0700

This sounds like an incripted message.  I have been getting it all day.  No
more!  Sorry I am not an engineer but  I am an engineering recruiter.
deborah

-----Original Message-----
From:	Greg Smith [mailto:strusup(--nospam--at)gte.net]
Sent:	Wednesday, February 17, 1999 4:53 PM
To:	seaint(--nospam--at)seaint.org
Subject:	Re: Clay/brick smokestacks

The reference I have advises against ANY tension and the equ. for tensile
unit stress in psi is   (Ws+Wl+Wf)/(113*Df^2) - Mf/(170*Df^3) where
Ws=(150*h/3)*(A+sqr(A*At)+At).... A=net area of base in ft^2,
At=net area of top in ft^2, h=ht. in ft.,....Wl=Weight of lining which would
be the interior wythe and Wf=weight of foundation, Df=dia. of foundation
base in feet and Mf=overturning moment at base(wind)=
2*Pw*H^2(D+2Dt) + 6PwH*(height of found.)*(D+Dt) where H=height above
foundation and Pw=wind pressure.
If equ. at top is < 0.0 then there is tension.

Greg
-----Original Message-----
From: Walkleypa(--nospam--at)aol.com <Walkleypa(--nospam--at)aol.com>
To: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org>
Date: Wednesday, February 17, 1999 1:19 PM
Subject: Re: Clay/brick smokestacks

>We are conducting a study of an 115' smokestack constructed in the sixties,
I
>am looking for a possible source name or other information for what is
either
>brick or clay blocks that have an exposed face of 5" by 7" by various
depths
>to form a 16" wall and a 12" wall. The "bricks" have holes making them
hollow
>or semi-solid.
>The base diameter is 10.5' and by calculation seems over stressed due to
>tension, so I am hoping the original material has better properties than
those
>assumed(guessed at) so far.
>
>
>Thanks,
>
>Jeff
>
>