Flexural Behavior and Design of Reinforced Fiber Concrete Members


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Title: Flexural Behavior and Design of Reinforced Fiber Concrete Members

Author(s): R. J. Craig

Publication: Special Publication

Volume: 105


Appears on pages(s): 517-564

Keywords: beams (supports); computer programs; ductility; fiber reinforced concretes; flexural strength; high-strength concretes;lightweight concretes; metal fibers; reinforced concrete; T-beams; reinforcing steels; structural analysis; structural design; Design

Date: 12/1/1987

Use of reinforced fiber concrete in buildings, for construction of an adequate section to resist a flexural failure, has been under investigation by engineers in the past decade. Design and analysis methodologies are discussed in the paper so this type of construction can be developed successfully by engineers. In the first part of the paper, results from 13 beams that were tested at New Jersey Institute of Technology are presented to show the nature of the flexural behavior. These beams are for: 1) normal concrete, 2) high-strength concrete, and 3) lightweight concrete with and without fibers. Most of the results from these tests have not been reported previously. A computer program will also be shown that accurately predicts the flexural behavior of these beams and other reinforced fiber concrete members. Using these test results and the computer program, inelastic and elastic behavior in flexure are discussed. The majority of the paper deals with analysis and design methods. All past methods of analysis are discussed briefly. A method that has been developed by NJIT is explained for analyzing regular singly reinforced, doubly reinforced, and T-beams. The {rho}b criteria is explained for each case, and analysis equations and design methodology are shown for each type of beam. Hence, the paper shows the state-of-the-art in analysis with the examples, and presents a rational design scheme for use by the design engineer that will help in the adoption of such a construction material.