Accession Number : ADA324695

Title :   Performance of Carbon Fiber Reinforced Polymer (CFRP) Tendons and their use for Strengthening of Prestressed Concrete Beams.

Corporate Author : NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF CIVIL ENGINEERING

Personal Author(s) : Van Jerrett, Carl

PDF Url : ADA324695

Report Date : 21 APR 1997

Pagination or Media Count : 263

Abstract : The purpose of this study was to investigate the performance of Carbon Fiber Reinforced Polymer (CFRP) tendons and their use for strengthening of prestressed concrete beams. The study involved two phases. In the first phase, the performance and ultimate strength of CFRP tendons were investigated, with emphasis on the performance and ultimate strength of the tendon under combined axial load and harping. In the second phase, the performance of prestressed concrete beams strengthened by using exterior post-tensioned CFRP tendons was investigated. The second phase also included the development of an analytical model for predicting the behavior of strengthened beams and conducting a limited parametric study of prestressed concrete beams strengthened by exterior post-tensioned tendons. The first phase of this study involved the testing of 0.32 in. (8 mm) diameter CFRP tendons subjected to uni-axial loading, combined axial loading and harping, bending tension fatigue loading, and sustained loading under combined axial load and harping. Harping points consisted of curved plates with radii of 1 in. (25 mm), 5 in. (102 mm), and 20 in. (508 mm). Bending tension fatigue tests were conducted up to 1 million cycles with axial loads ranging between 14.0 and 14.7 kips (62.3 and 65.4 kN) and bend angles between 4.5 and 5.5 degrees. Sustained loading tests were conducted over a duration of 120 days with tendons subjected to axial loads of about 12 kips (53 kN) and bend angles of 7.0 degrees. At the completion of all fatigue and sustained loading tests, residual strength tests were conducted under combined axial load and harping.

Descriptors :   *POLYMERS, *BEAMS(STRUCTURAL), *FIBER REINFORCED COMPOSITES, *CARBON FIBERS, *FIBER REINFORCEMENT, *TENDONS, *PRESTRESSED CONCRETE, TEST AND EVALUATION, MATHEMATICAL MODELS, ANGLES, PARAMETRIC ANALYSIS, LOADING(HANDLING), LOADS(FORCES), FAILURE, TEST METHODS, BENDING, STRENGTH(MECHANICS), CURVATURE, PLATES, RESIDUALS, TENSION, STRENGTH(GENERAL), AXES, FATIGUE, FATIGUE(MECHANICS), FATIGUE TESTS(MECHANICS), AXIAL LOADS.

Subject Categories : Ceramics, Refractories and Glass
      Refractory Fibers
      Construction Equipment, Materials & Supplies
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE