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Computers and Concrete Volume 31, Number 4, April 2023 (Special Issue) pages 349-358 DOI: https://doi.org/10.12989/cac.2023.31.4.349 |
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Strengthening of prestressed girder-deck system with partially debonding strand by the use of CFRP or steel plates: Analytical investigation |
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Haoran Ni, Riliang Li and Riyad S. Aboutaha
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| Abstract | ||
| This paper describes an in-depth analysis on flexural strength of a girder-deck system experiencing a strand debonding damage with various strengthening systems, based on finite element software ABAQUS. A detailed finite element analysis (FEA) model was developed and verified against the relevant experimental data performed by other researchers. The proposed analytical model showed a good agreement with experimental data. Based on the verified FE model, over a hundred girder-deck systems were investigated with the consideration of following variables: 1) debonding level, 2) span-to-depth ratio (L/d), 3) strengthening type, 4) strengthening material thickness. Based on the data above, a new detailed analytical model was developed and proposed for estimating residual flexural strength of the strand-debonding damaged girder-deck system with strengthening systems. It was demonstrated that both finite element model and analysis model could be used to predict flexural behaviors for debonding damaged prestressed girder-deck systems. Since the strands are debonding from surrounding concrete over a certain zone over the length of the beam, the increase of strain in strands can be linked with a ratio Psi, which is Lp/c. The analytical model was proposed and developed regarding the ratio Psi. By conducting procedure of calculating Psi, the Psi value varies from 9.3 to 70.1. Multiple nonlinear regression analysis was performed in Software IBM SPSS Statistics 27.0.1 to derive equation of Psi. Psi equation was curved to be an exponential function, and the independent variable (X) is a linear function in terms of three variables of debonding level (lambda), span length (L), and amount of strengthening material (As). The coefficient of determinate (R2) for curve fitting in nonlinear regression analysis is 0.8768. The developed analytical model was compared to the ultimate capacities computed by FEA model. | ||
| Key Words | ||
| CFRP; debonding strands; finite element analysis; analytical model; flexural strength; prestressed concrete | ||
| Address | ||
| Department of Civil and Environmental Engineering, Syracuse University, 151 Link Hall, NY 13244, USA | ||