CUED Publications database

Time-dependent load-sharing in RC beams strengthened with CFRP straps

Jin, F and Lees, JM (2015) Time-dependent load-sharing in RC beams strengthened with CFRP straps. In: UNSPECIFIED pp. 162-167..

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© 2015, NetComposites Limited. Reinforced concrete (RC) beams strengthened with pre-stressed carbon-fibre-reinforced polymer (CFRP) straps have shown substantial increases in shear capacity when subjected to short-term monotonic loads. After cracking, the shear resistance of RC beams with external CFRP straps can be decomposed into a number of resisting actions provided by the CFRP straps, shear links, aggregate interlock, dowel action and inclined compression struts. However, the load-sharing between these shear resistance components over the long term has not been studied extensively and is not well understood. The current work investigates how these contributions change with time. Long term tests were carried out to apply sustained load to an un-strengthened and a strengthened RC beam. The time-dependent crack development, and shear link and strap strains were recorded. The load-sharing behaviour was then analysed based on a combination of experimental data and theoretical modelling. It was found that the inclusion of CFRP straps not only limited the crack development, but also reduced the variations within the time-dependent load-sharing.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div D > Structures
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:27
Last Modified: 22 May 2018 07:29