Numerical Optimization of a Compact and Reusable Pretensioning Anchorage System for CFRP Tendons
Publication: Journal of Composites for Construction
Volume 15, Issue 2
Abstract
Efficient use of pultruded carbon fiber–reinforced plastic profiles (CFRP tendons) to prestress high-performance concrete (HPC) highly depends on the performance of the anchorage system and on material choice. For current applications, a prestressing degree of approximately 40% of the CFRP material strength is utilized in pretensioned concrete elements. A higher prestress implicates lower costs of fully prestressed concrete elements. The present project aimed to optimize the design of a removable and reusable pretensioning anchorage system for sand-coated CFRP rods. The optimized design was achieved by means of finite-element calculations in which parametric studies were complemented with extensive experimental work for validation. Analytical results demonstrated a reduction up to 25% for the relevant stress peaks in the tendons. The static rupture load under laboratory conditions increased by 25%, and the pretensioning level on-site could be increased by 50%. This improvement in production efficiency can be explained by easier applicability of the new system, i.e., failure tolerant assembly and prestressing process.
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Acknowledgments
The writers would like to thank SACAC Schleuderbetonwerk AG, their managing director Mr. Georges Bättig, and their research and development engineers Mr. Jacek Gwozdz and Birol Kanik for their collaboration. Assistance in testing by Hans Michel and Daniel Völki is greatly acknowledged. Last but not least, the continuous support received through numerous valuable discussions with Prof. Dr. H.C. Urs Meier for the past 15 years on the research and development of slender CFRP prestressed HPC elements is greatly appreciated. This project was partially funded by the Commission for Technology and Innovation (CTI) of the Swiss Confederation.
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Information
Published In
Journal of Composites for Construction
Volume 15 • Issue 2 • April 2011
Pages: 126 - 135
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Oct 8, 2009
Accepted: May 11, 2010
Published online: Sep 10, 2010
Published in print: Apr 1, 2011
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