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Smart/Innovative Concrete Pedestrian Bridge Research Using Carbon Fiber Reinforced Polymer (CFRP) Tendons-Rebars and Integrated Fiber Optic Sensors.
| 题名： | Smart/Innovative Concrete Pedestrian Bridge Research Using Carbon Fiber Reinforced Polymer (CFRP) Tendons-Rebars and Integrated Fiber Optic Sensors. |
| 作者： | saafi, m. |
| 关键词： | tendons, bars, serviceability |
| 摘要： | Fiber reinforced polymers (FRP) have been proposed for use in lieu of steel for reinforcement and prestressing tendons in concrete structures. The promise of FRP materials lies in their high-strength, lightweight, non-corrosive, non-conducting, and non-magnetic properties. In addition, FRP manufacturing offers a unique opportunity for the development of shapes and forms that would be difficult or impossible to fabricate with conventional steel materials. Lighter weight materials and preassembly of complex shapes can boost constructability and efficiency of construction. However, despite the much higher strength to weight ratios exhibited by FRP tendons and bars, there are a number of drawbacks that hinders their widespread usage. In comparison to the ductile elasto-plastic behavior of conventional steel reinforcement, the stress-strain response of FRP composites exhibit brittle behavior and are linear-elastic all the way to failure without warning. This issue affects serviceability, design, and safety of FRP tendons in concrete bridges. Therefore, concrete structures reinforced with FRP materials must be monitored continuously to measure the strain gradient and to detect and localize any breakage in the fiber as well as to detect invisible cracks and their location in the concrete. The objective of this project is to develop smart and self-sensing components for FRP reinforced and prestressed bridges. Distributed Bragg Grating fiber optic sensors were developed, fabricated and integrated into CFRP prestressed concrete T-beams and CFRP reinforced concrete decks to monitor strains, crack width and spacing during the loading. The objective of the experimental program was to evaluate serviceability in terms of crack width, crack distribution, ultimate strength, failure mode, and fatigue life of the proposed smart bridge as well as Bragg Grating sensor calibration. / Supplementary Notes: Sponsored by Alabama Dept. of Transportation, Montgomery. Research and Development Bureau. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |
| 报告类型： | 科技报告 |
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