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RE: What a Structural Engineer Should Memorize

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            John,

                        As to, “How about for concrete?” – “Half the span (expressed in inches) is the likely required depth for a steel beam (i.e. 24-feet span = W12):”

                        For a simple span precast concrete girder, the clear span in feet is the maximum depth in inches. A 24’ clear span inverted tee beam 24” deep should carry a bay of double tees on each side. Usually, the girder depth can be lower.

            Jim Getaz

            Precast Concrete Engineer