CUED Publications database

Time-dependent shear transfer in reinforced concrete beams strengthened with CFRP straps

Jin, F and Lees, JM (2014) Time-dependent shear transfer in reinforced concrete beams strengthened with CFRP straps. In: UNSPECIFIED.

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Abstract

Reinforced concrete beams strengthened with transverse pre-stressed un-bonded carbonfiberreinforced polymer (CFRP) straps have shown substantial increases in shear capacity when subjected to short-term monotonic loading. The current work investigates how the load-sharing in CFRP strengthened beams changes with time. Cracked reinforced concrete transfers shear forces along the cracks due to aggregate interlock and dowel action and this affects the load distribution within a strengthened beam. An understanding of the long-term shear transfer is therefore important. Shear transfer is not only relevant to the strength prediction but also to the serviceability performance in terms of the crack development and beam deformation. Experimental work has been carried out using push-off tests to investigate the shear transfer under short-term loads. However, the shear transfer mechanisms in reinforced concrete subjected to sustained loads has not been studied as extensively and is not well understood. An investigation of how the time-dependent shear transfer influences the shear behaviour of un-strengthened and CFRP strap-strengthened reinforced concrete is undertaken. The disturbed stress field model (DSFM) is used as the basis for the time-dependent shear behaviour predictions. The necessity for further studies relating to the long-term behaviour is also assessed.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: UNSPECIFIED
Divisions: Div D > Structures
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:27
Last Modified: 24 Aug 2017 01:29
DOI: