Author： Yang In-Hwan Joh Changbin Kim Byung-Suk
Publisher： NRC Research Press
ISSN： 1208-6029
Source： Canadian Journal of Civil Engineering, Vol.38, Iss.11, 2011-11, pp. : 1185-1195
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Abstract
The flexural behavior of prestressed ultra high performance concrete (UHPC) beams is investigated in this study. The paper proposes a method for predicting the flexural strength of prestressed UHPC beams with a compressive strength greater than 150 MPa, including an experimental program and associated numerical analyses. Four large-scale prestressed beams were tested in the experimental program. Detailed experimental test results for the flexural behavior of prestressed UHPC beams are provided. A method for incorporating steel fibre effects into the flexural analysis of prestressed UHPC beams is proposed and applied to interpret the experimental test results. The study focuses primarily on the flexural behavior of UHPC beams. The analytical model for the flexural behavior of beams takes tensile softening into account. Tensile softening is simulated using an inverse analysis based on the load-crack mouth opening displacement relationship. Test data and numerical analysis results for flexural strength are compared, indicating a reasonable agreement between beams. The present study allows realistic prediction of the flexural strength of prestressed UHPC beams.
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