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RE: Round Concrete beam

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Title: RE: Round Concrete beam

Careful..Rastras evaluation report from ICBO contained a shape reduction factor and a strength reduction factor to be included when applying ACI 318 also talked in terms of equivalent solid thicknesses (that isa wall-type analysis).

Also, if you dont use a wall analysis approach for example, each core has to be reinforced since you cant 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 addressedbasically, 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.


Robert C. Rogers, PE

Project Engineer

Steven Schaefer Associates, Inc.

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