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Published in:
2011 | OriginalPaper | Chapter
Concrete Column Shape Modification with FRP and Expansive Cement Concrete
Authors : Zihan Yan, Chris P. Pantelides, Jeffrey B. Duffin
Published in: Advances in FRP Composites in Civil Engineering
Publisher: Springer Berlin Heidelberg
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Fibre Reinforced Polymer (FRP) composites are an effective material for confining circular concrete columns. FRP confinement for square and rectangular columns is less effective due to stress concentrations at the sharp corners and loss of the membrane effect. Shape modification using post-tensioning of FRP shells through expansive cement concrete is described. In the field, shape modification can be achieved by utilizing pre-fabricated FRP shells as the permanent forms. An analytical model is briefly introduced to predict results of the experiments regarding the enhanced stress-strain behaviour of FRP-confined concrete. The confinement model and shape modification technique with FRP shells and expansive cement concrete are used in simulations of seismic rehabilitation of square columns for existing reinforced concrete bridges and are compared to in-situ tests of square columns with bonded FRP jackets.