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RE: Round Concrete beam[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Round Concrete beam
- From: "Robert C. Rogers" <rcr(--nospam--at)ssastructural.com>
- Date: Thu, 25 Aug 2005 15:36:56 -0400
Title: RE: Round Concrete beam
Careful…..Rastra’s evaluation report from ICBO contained a shape reduction factor and a strength reduction factor to be included when applying ACI 318 equations….it also talked in terms of equivalent solid thicknesses (that is…a wall-type analysis)….
Also, if you don’t use a wall analysis approach for example, each core has to be reinforced since you can’t use Chapter 22 Structural Plain Concrete (because “Plain Columns” are not permitted)…..I have yet to see any design-office analytical treatment of a screen-grid wall where concentrated load distribution is addressed…basically, what you really have is a wall with a bunch of holes through it ….
The prescriptive requirements in the IRC are based on some full-scale testing……and some analytical work….
Steven Schaefer Associates, Inc.
Phone: (513) 542-3300 Direct: (513) 233-7085
Fax: (513) 542-5540 Toll Free: (800) 542-3302
Consulting Structural Engineers
From: Jnapd(--nospam--at)aol.com [mailto:Jnapd(--nospam--at)aol.com]
Sent: Thursday, August 25, 2005 3:16 PM
Subject: Re: Round Concrete beam
It sounds like you could use the design methods like you do for Rastra. The concrete cores with steel are the same as the few Rastra projects I did in the early 90's.
Johnson & Nielsen Associates
Palm Springs, CA
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