Graphical Evaluation of the Effective Moment of Interia for Deflection

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Title: Graphical Evaluation of the Effective Moment of Interia for Deflection

Author(s): Leroy A. Lutz

Publication: Journal Proceedings

Volume: 70

Issue: 3

Appears on pages(s): 207-213

Keywords: beams (supports) ; bending moments: building codes: cracking (fracturing) ; deflection; evaluation; moments of inertia; reinforced concrete; structural design.

Date: 3/1/1973

Abstract:
Determination of the effective moment of inertia as defined in ACI 318-71 for deflection calculations is made easier by the use of four sets of curves. The process of determining from curves the gross moment of inertia, the cracked section moment of inertia, the cracking moment, and the effective moment of inertia are illustrated by examples.