Innovative strengthening technique using post-tensioned fibre composite wraps for bridge headstocks

Aravinthan, T. and Heldt, T. (2010) Innovative strengthening technique using post-tensioned fibre composite wraps for bridge headstocks. Australian Journal of Structural Engineering, 11 (2). pp. 117-128. ISSN 1328-7982

Abstract

Engineered fibre composites offer an extremely versatile option to strengthen existing structures to solve structural problems arising from environmental exposure, inadequate designs, increased traffic loads and continuous aging of existing structures. While the behaviour of structures by external post-tensioning using fibre composites for flexure is well understood, there is limited research on shear strengthening, specifically using prestressed fibre composites. An innovative system using fibre composites has been investigated for strengthening bridge headstocks with deficient structural performance. The innovative system uses fibre composite wraps which forms an infinite loop around the headstocks and together with anchorage blocks, these are pushed-out and the gap packed with a suitable spacer to maintain the applied pre-stressing force. This paper discusses the research, development and construction of this innovative fibre composite post-tensioning system and testing it on a model bridge headstocks in Tenthill Creek Bridge. Issues related to the effect of existing shear cracks and the importance of repairing such cracks will be discussed. With further investigation, this strengthening system could be implemented in actual structures to enhance the capacity of bridge headstocks.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy.
Depositing User: Prof Thiru Aravinthan
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 16 May 2012 06:12
Last Modified: 03 Jul 2013 00:57
Uncontrolled Keywords: fibre composites; fibre wraps; post-tension; shear strengthening; concrete; headstocks; bridges
Fields of Research (FOR2008): 09 Engineering > 0905 Civil Engineering > 090505 Infrastructure Engineering and Asset Management
09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
URI: http://eprints.usq.edu.au/id/eprint/20368

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