Title: Analytical Deflection Evaluation of Partially Prestressed Fiber Reinforced Concrete Beams

Author(s): A. Samer Ezeldin

Publication: Symposium Paper

Volume: 142

Issue:

Appears on pages(s): 269-294

Keywords: beams (supports); deflection; fiber reinforced concretes; flexural strength; metal fibers; microcomputers; prestressed concrete; moment-curvature relationship; stresses; Design

DOI: 10.14359/3964

Date: 1/1/1994

Abstract:
Partially prestressed beams contain both prestressed and non-prestressed reinforcement. Addition of steel fibers results in an increase in first crack moment and flexural strength and a decrease in deflection and reinforcement stresses. This paper presents an analytical method to compute the deformation of partially prestressed beams made with fiber reinforced concrete. A computer program was developed to evaluate the theoretical moment-curvature and moment-deflection relationships. It uses the linear and nonlinear stress-strain relationships of the composite materials. Strain compatibility concept is incorporated to obtain the stresses in concrete, prestressed steel, and non-prestressed steel. The cracking moment and the nominal flexural strength are also computed. The method can analyze prestressed sections of rectangular, T, I, and box shapes. The analytical predictions of the proposed method agree well with experimental results.