Functionality of Damaged Steel Truss Systems Strengthened with Posttensioned CFRP Tendon
Publication: Journal of Composites for Construction
Volume 17, Issue 3
Abstract
This paper presents the functionality of truss systems damaged and strengthened with carbon fiber reinforced polymer (CFRP) tendon. Sixteen damage scenarios are designed by disconnecting various web members of a laboratory-scale truss. A posttensioning technique is proposed using steel tubes and non-shrink mortar embedded with the CFRP. Tension tests are conducted to evaluate the feasibility of the anchorage. Experimental trusses are monotonically loaded in service and a three-dimensional finite-element model is constructed to simulate the test data. Deflection characteristics of the truss system are influenced by the presence of local damage. The proposed posttensioning method enhances the serviceability of the strengthened truss system by reducing decompression–deflection. However, the level of posttension force is not related to the flexural stiffness of the truss from a practical perspective. Stress redistribution is observed in the truss system due to the CFRP strengthening, including a load-sharing mechanism among the members. CFRP strengthening enhances structural redundancy and functional performance of the truss systems.
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Acknowledgments
The authors gratefully acknowledge support from North Dakota State University. The ASCE Steel Bridge Team in the Department of Civil Engineering at NDSU contributed to the design and fabrication of the truss bridge used.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 17 • Issue 3 • June 2013
Pages: 383 - 394
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Oct 30, 2012
Accepted: Jan 9, 2013
Published online: Jan 11, 2013
Published in print: Jun 1, 2013
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