Fatigue Behavior of Basalt Fiber-Reinforced Polymer Tendons for Prestressing Applications
Publication: Journal of Composites for Construction
Volume 20, Issue 3
Abstract
This paper studies the fatigue behavior of high-strength basalt fiber-reinforced polymer (BFRP) tendons for potential applications in prestressed structures. An effective anchoring method of winding fiber sheets was first developed for fatigue testing of BFRP tendons to avoid premature failure at the anchorage. The fatigue stress ranges from 0.05 to ( = ultimate tensile strength) and maximum stresses from 0.6 to were determined, whereas the elastic modulus of BFRP tendons during the fatigue tests was measured. The fatigue failure mechanism was analyzed and elaborated at both the macro- and microscopic levels. The appropriate fatigue stress range and maximum stress level were predicted from both experimental fitting and reliability analysis. The results show that the fatigue failure of a BFRP tendon is mainly induced by the debonding among fiber-matrix interfaces at the outer layer of the tendon. The fatigue stress range greatly affects the fatigue life of BFRP tendons. The BFRP tendons can sustain 2 million cyclic loadings under a stress range of (85 MPa) and maximum stress of (1,018 MPa). Furthermore, the elastic modulus of BFRP tendons before failure remains constant regardless of the number of cycles. Prediction of fatigue strength (limit of stress range and maximum stress to sustain 2 million cyclic loadings) based on experimental fitting shows a satisfactory consistency with the previously mentioned experimental results (0.05 and ). A recommendation of a stress range of (68 MPa) and maximum stress of (899 MPa) are proposed with 95% reliability for BFRP tendons in prestressing applications.
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Acknowledgments
The authors gratefully acknowledge the financial support provided by the National Key Basic Research Program of China, 973 Program (No. 2012CB026200), the National Twelfth Five-year Plan Science & Technology Support Development Program of China (No. 2014BAB15B01) and the National Science Foundation of China (NSFC, 51378109). The authors also acknowledge Jiangsu GMV for providing BFRP tendons.
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© 2015 American Society of Civil Engineers.
History
Received: Jun 27, 2015
Accepted: Sep 23, 2015
Published online: Dec 14, 2015
Discussion open until: May 14, 2016
Published in print: Jun 1, 2016
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