Deflection of Prestressed Concrete Two-Way Floor Systems

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Title: Deflection of Prestressed Concrete Two-Way Floor Systems

Author(s): Amin Ghali

Publication: Structural Journal

Volume: 87

Issue: 1

Appears on pages(s): 60-65

Keywords: computer programs; cracking (fracturing); creep properties; deflection; floors; partial prestressing; prestressed concrete; shrinkage; reinforced concrete; stress relaxation; stress-strain diagram; two-way slabs; Structural Research

DOI: 10.14359/2925

Date: 1/1/1990

Abstract:
Deflections at the center of rectangular panels of two-way floor systems are predicted from the curvatures of column and middle strips. A procedure is reviewed for calculating the changes in stress and strain distributions in reinforced concrete sections with or without prestressing. The method is based on compatibility and equilibrium and accounts for creep and shrinkage of concrete and relaxation of prestressed steel. It also accounts for cracking associated with partially prestressed or nonprestressed members. The slopes of the strain diagrams for the sections are equal to the curvatures that can be used to calculate deflections. A numerical example is included.


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