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Re: AWWA D100-05 3.5.1 question

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You are asking a not-so-specific question about a very special component of a very special type of structure.  For example, it is not clear what kind of tank you got; with little known, you are unlikely to get a sensible response. 
Most importantly, though, the location of the girder may be dictated by some non-structural considerations (operational, maintenance, health, safety, etc.).  Such considerations need to be discussed and cleared with the architect, AHJ, and AWWA itself. 
In my experience, I had a very little problem contacting people who wrote the AWWA code and getting comprehensive answers to my questions.
Good luck,
V. Steve Gordin, SE
Irvine CA
----- Original Message -----
Sent: Friday, July 24, 2009 14:14
Subject: RE: AWWA D100-05 3.5.1 question

Compression flange issue could be resolved by providing a rectangular or square tube section with adequate section modulus instead of built up channel generally provided on outside of tank.

So, can I use a tube section of adequate section modulus inside the tank as stiffening girder?




Sid Lakhani




From: Garner, Robert [mailto:rgarner(--nospam--at)]
Sent: Friday, July 24, 2009 7:05 AM
To: seaint(--nospam--at)
Subject: RE: AWWA D100-05 3.5.1 question


Will this result in an unbraced flange in compression instead of tension?


From: Lakhani, Sid [mailto:slakhani(--nospam--at)]
Sent: Thursday, July 23, 2009 3:18 PM
To: seaint(--nospam--at)
Cc: Lakhani, Sid
Subject: FW: AWWA D100-05 3.5.1 question




AWWA (Eq 3-35) on page 35 provides formula for required section modulus for Girder.


My question is:  Can this girder be provided either inside or outside the tank? Does it have to be on outside the tank?


I would like to provide the girder inside the tank to avoid interference with the ladder/stair.




Sid Lakhani