Flexural Design of Fiber-Reinforced Concrete

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Title: Flexural Design of Fiber-Reinforced Concrete

Author(s): Chote Soranakom and Barzin Mobasher

Publication: Materials Journal

Volume: 106

Issue: 5

Appears on pages(s): 461-469

Keywords: composite concrete flexural members; design; fiber-reinforced concrete.

DOI: 10.14359/51663147

Date: 9/1/2009

Abstract:
A set of closed form equations for flexural design of fiber-reinforced concrete are presented. These equations are based on simplified tensile and compressive constitutive response and may be used in a limit state approach or serviceability-based criterion that limits the effective tensile strain capacity. The equations allow generation of flexural moment-curvature response of a rectangular beam section for use in structural analysis calculations in addition to design charts for strain softening fiber-reinforced concrete. To prevent sudden failure after flexural cracking and to control crack width, equations for minimum post-crack tensile strength are also proposed. The analytical tensile strain equations proposed for serviceability limit the average crack width of structural members. In addition, the bilinear moment-curvature model is used in conjunction with geometrical relationship between curvature and deflection to determine short-term deflections of structural members. An example of a one-way slab demonstrates the calculation steps.


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