Electronic Thesis and Dissertation Repository

Thesis Format

Integrated Article

Degree

Master of Engineering Science

Program

Civil and Environmental Engineering

Supervisor

Bartlett, F. Michael

2nd Supervisor

Youssef, Maged A.

Co-Supervisor

Abstract

Using High Strength Reinforcement (HSR) in concrete construction allows steel volumes to be reduced, and economies to be realized. CSA Standard A23.3:19 “Design of Concrete Structures” limits the maximum yield strength for design to 500 MPa. This thesis investigates the flexural behavior of concrete beams reinforced with HSR to assess whether current code provisions are appropriate. Curvature ductility ratios are calculated for cross-sections with varying concrete compressive strengths, and reinforcement types and quantities. The effects of utilizing HSR on extreme fibre concrete compressive strains at Ultimate Limit State (ULS), moment redistribution at ULS, and deflections at Serviceability Limit States, are investigated. It was found that curvature ductility factors for sections reinforced with HSR are relatively less; A23.3:19 Clause 9.2.4, which specifies the maximum permissible moment redistribution at ULS, is appropriate for all beams investigated; and designs that meet the minimum height requirements of A23.3:19 Table 9.2 satisfy the deflection limits in A23.3:19 Table 9.3 for all beams investigated.

Summary for Lay Audience

This thesis investigates the behavior of concrete beams reinforced with High Strength Reinforcement (HSR) that are not covered by the current Canadian Standards. Using HSR reduces the volume of steel, easing construction and potentially saving costs. Numerical simulations are conducted to quantify the behavior of beams reinforced with High Strength Reinforcement. Ductility is a desirable characteristic as it provides warning of imminent failure. Beams reinforced with HSR were found to be less ductile than those with conventional reinforcement, which should be considered in the design stage. Other flexural characteristics for members with HSR subjected to both in-service and failure loads are investigated, and the current design standards are adequate for these cases.

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