Load-Deformation Relationships for High Strength Concrete Beams Reinforced With Prestressed Prisms as Main Reinforcement

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Title: Load-Deformation Relationships for High Strength Concrete Beams Reinforced With Prestressed Prisms as Main Reinforcement

Author(s): B. Chen and E. G. Nawy

Publication: Special Publication

Volume: 161

Issue:

Appears on pages(s): 127-148

Keywords: beams (supports); cracking (fracturing); high-strength concretes; deflection; moment-curvature relationship; prestressed concrete; prisms; strains; Structural Research

Date: 4/1/1996

Abstract:
Use of prestressed prisms as main reinforcement has been demonstrated to be effective in limiting cracks and reducing deflections in high-strength, high performance concrete beams. To further understand the load-deformation history of such type of structural members, computer-simulated analysis has been conducted. A nonlinear analytical model based on strain compatibility was established. Theoretical predictions are compared with the experimental data obtained by the authors. Comprehensive computer-simulated flexural tests were also performed on a theoretical member section to further identify the variables which may affect the structural behavior. Parametric study suggests that the section ductility is mainly controlled by the reinforcing index. The influences of the effective prestress and concrete strength on ductility is found to be insignificant. Fiber optic Bragg-grating sensor technology was developed and used to internally and externally measure the deformations and cracking in the specimens.