Shear and Flexural Behavior of Reinforced Polyester Concrete Beams


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Title: Shear and Flexural Behavior of Reinforced Polyester Concrete Beams

Author(s): Lawrence I. Knab and John P. Cook

Publication: Journal Proceedings

Volume: 71

Issue: 10

Appears on pages(s): 493-501

Keywords: beams (supports); concretes; creep properties; esters; flexural strength; loading rate; loads (forces); poly-mer- cement concrete; reinforced concrete; shear properties; structural members.

Date: 10/1/1974

The feasibility of using reinforced polyester concrete in structural beams is studied. A preliminary investigation and analysis of the shear and flexural behavior of reinforced polyester concrete for short (1 hr) and long (44 days) term loading is presented. To evaluate the effects of short-term monotonic loading, 27 shear beams and 18 flexural beams with varying length to depth ratios were tested. The flex-Ural beams exhibited relatively high strength accompanied by very large deflections. The effects of the depth and length to depth ratio on shear and moment stress param-eters were statistically analyzed. The shear and stress parameters were shown to be meaningful in the behavior of the beams tested. Empirical and theoretical relationships which description portland cement concrete shear and flexural behavior be wer e shown to underestimate the ultimate shear and fl exural strengths of the polyester concrete beams investigated. The relatively low stiffness, large ultimate strain, a significant creep of polyester concrete can give . and relatively large structural deformations, rise to including large beam deflections. The deflection due to long-term sustained loading for a typical beam was shown to be significant, In both short and long-term loading applications required . ing high compressive strength, large energy dissipation and good dampening characteristics, the polyester concretes should function well. This is provided that deformation is not a critical factor. If deformation is critical, then adequate support must be provided. [Authors]