TIME-DEPENDENT DEFLECTION OF PRESTRESSED AND NON-PRESTRESSED FRP-STRENGTHENED STRUCTURES | ||||
| JES. Journal of Engineering Sciences | ||||
| Article 3, Volume 38, No 3, May and June 2010, Page 641-653 PDF (173.93 K) | ||||
| Document Type: Research Paper | ||||
| DOI: 10.21608/jesaun.2010.124387 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| H. M. Diab1; Mamdouh Abass2 | ||||
| 1Department of Civil Engineering, Assiut University, Egypt | ||||
| 2Department of Civil Engineering, Sohag University, Egypt | ||||
| Abstract | ||||
| External bonding of fiber reinforced polymer (FRP) sheets has been proven to be an effective method to strengthen and retrofit deteriorated or damage RC or PC structures. However, the long-term serviceability of such FRP-strengthened beams is still a concern due to lack of long-term performance data especially for prestressed FRP sheets. This study presents a manual method for predicting the short-term and time-dependent deflections for RC beams strengthened by prestressed or non-prestressed FRP sheets. The age-adjusted effective modulus method is used to model the creep behavior in concrete and the relaxation in FRP prestressing sheets. A tension-stiffening model is presented to evaluate the stiffness of the cracked section. The analytical values are compared to the results obtained from a finite element code, and to the experimental results from some existing papers. It is found that the analytical method is in a good agreement with finite element methods. | ||||
| Keywords | ||||
| Fiber reinforced polymer; concrete; time dependent deflection; prestressed FRP sheets; creep | ||||
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