Abstract
This paper presents the parametric analysis conducted to derive the optimal dimensions of the steel sleeve necessary to secure the bond performance of the swaging type anchorage for CFRP tendon with diameter of 5 mm. To that goal, finite element analysis is performed on the parameters determining the dimensions of the sleeve like the thickness and inner diameters of the sleeve. The results show that a constant swaging pressure of about 450 MPa on the mean is distributed in the sleeve when the thickness ratio of the stress relief zone to the effective swaging zone of the sleeve is larger than 1.1 and that the swaging pressure tends to reduce linearly as much as this thickness ratio becomes smaller than 1.1. The pressure varies within a range of about 30% according to the change in the inner diameter of the sleeve whereas varies within a range less than 10% according to the change in the inner diameter when the thickness ratio is larger than 1.1. Finally, the optimal dimensions of the steel tube sleeve enabling to secure an anchor force larger than the rupture strength of the CFRP tendon with diameter of 5 mm are determined based upon the results of the parametric analysis.
Highlights
Research has been actively conducted on the repair and strengthening of structures using carbon fiber-reinforced polymer (CFRP) material
The pressure according to varying inner diameter shows poor variation below about 10% when the thickness ratio is larger than 1.1 but exhibits increased variation as much as the thickness ratio reduces below 1.1
This paper presented the results of a parametric analysis
Summary
Research has been actively conducted on the repair and strengthening of structures using carbon fiber-reinforced polymer (CFRP) material. Jung et al [3] evaluated the anchor performance of the swaging type anchor through an experimental study considering various parameters including the dimensions of the sleeve, and the eventual presence of insert Their experimental results revealed that the anchor performance of the swaging type anchor varied according to the change in the swaging pressure itself depending on the inner and outer diameters of the sleeve. This analysis enabled to state the existence of an adequate stress and of corresponding optimal dimensions of the sleeve to secure the tendon anchor performance. The optimal dimensions of the sleeve enabling to obtain the appropriate pressure are derived to secure the bond force of the CFRP tendon
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