Abstract
This paper examines the shear stress and displacement occurring in CFRP tendons through finite element analysis on the parameters influencing the anchoring performance to evaluate the behavioral characteristics of the bonded type anchorage for CFRP tendon. The selected parameters are the inner angle of the anchorage barrel, the friction between the barrel and filling material, and the elastic modulus of the filling material. The difference in the behavioral characteristics is examined for each parameter. In view of the analytic results, the shear stress developed in the CFRP tendon reduces with larger inner angle of the barrel and lower elastic modulus of the filling material. However, such combination provokes also the increase of the relative displacement of the CFRP tendon. Especially, slip failure may occur due to the lack of the confining force necessary for the anchorage due to the sudden loss of vertical force brought by the wedge force. The experimental results relative to barrel inner angles of 2° and 4° showed that the specimen with an angle of 2° preserved its anchoring performance up to tensile failure whereas the specimen with an angle of 4° failed in developing its maximum anchoring performance due to slip failure.
Highlights
Fiber Reinforced Polymer (FRP) has recognized recently wider applications in the construction sector owing to its advantageous material properties compared to the conventional construction materials such as concrete or steel like its higher specific strength, resistance to corrosion and convenient workability
The analysis revealed that all the anchorages filled with high strength mortar and inner angle of 2 ̊ experienced stresses lower than the shear strength of 267 MPa of the CFRP tendon developed by Korea Institute of Construction Technology (KICT) regardless of the coefficient of friction
Finite element analysis was conducted on the parameters affecting the anchoring performance and the shear stress and displacement occurring in the CFRP tendon were analyzed
Summary
Fiber Reinforced Polymer (FRP) has recognized recently wider applications in the construction sector owing to its advantageous material properties compared to the conventional construction materials such as concrete or steel like its higher specific strength (strength-to-weight ratio), resistance to corrosion and convenient workability. It is difficult to derive the appropriate dimensions of the sleeve considering the low shear strength of FRP [5] Both wedge type and pressure type anchorages are variants of the traditional anchorages used for steel tendons. The bonded type anchorage relies on the bond strength between FRP and the filling material without relying on the low shear strength of FRP. This type of anchorage has been proposed for the tensile test of FRP members in major standards dedicated to FRP such as ACI [6], ASTM [7] and CSA [8]. Directions for the fabrication of the bonded type anchorage necessary for the effective development of the anchoring performance are proposed based upon the analysis of the results of the tests conducted on various bonded type anchorages
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