Strengthening of bridge headstocks with external post-tensioning: design issues and strengthening techniques

Aravinthan, Thiru and Heldt, Tim (2005) Strengthening of bridge headstocks with external post-tensioning: design issues and strengthening techniques. In: Road System and Engineering Technology Forum, 9-11 August 2005, Brisbane, Australia.


There has been a need to strengthen headstocks in bridges due to increased traffic loading and aging bridges. External post-tensioning is a viable solution for such strengthening. While the behaviour of structures strengthening by external post-tensioning for flexure is well understood, there is limited knowledge on the shear strengthening.
In this paper, the application of external post-tensioning for shear strengthening of headstocks using conventional prestressing techniques will be discussed. Moreover, an innovative solution developed by the authors using externally prestressed fibre wraps will be presented. Issues related to the effect of existing shear cracks and the importance of repairing such cracks will be discussed, based on the results of model tests on the headstocks in Tenthill Creek Bridge.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: No
Item Status: Live Archive
Additional Information: Reproduced in accordance with the copyright policy of the Queensland Government. None of the material may be reproduced or used for commercial purposes without the written permission of the copyright owner.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 11 Oct 2007 00:24
Last Modified: 02 Jul 2013 22:33
Uncontrolled Keywords: post-tensioning; headstock; shear cracks; external prestressing; fibre reinforced plastic (FRP); concrete
Fields of Research : 12 Built Environment and Design > 1204 Engineering Design > 120402 Engineering Design Knowledge
09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Socio-Economic Objective: B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870399 Construction Materials Performance and Processes not elsewhere classified

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