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Lateral Strain-to-Axial Strain Model for Laterally Prestressed Concrete-Filled FRP Tubes

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Abstract:

Concrete-filled FRP tube (CFFT) columns have recently gained significant research attention, with a number of experimental studies identifying significant benefits of using high-strength concrete (HSC) to produce high-performance CFFT columns. A recent experimental investigation revealed that prestressing the fibers in the fiber reinforced polymer (FRP) confining shell leads to significant improvements in the axial compressive behavior of HSC-CFFTs. This paper reports the findings from an analytical investigation into the lateral strain-to-axial strain relationship for prestressed HSC-CFFTs. This understanding of the lateral strain-to-axial strain relationship is of particular importance for prestressed CFFTs due to the influence of the additional lateral prestrain. Initially a database that consists of 23 aramid FRP- (AFRP) confined HSC cylindrical specimens with lateral prestress of up to 7.3 MPa is presented. Based on close examination of the experimentally recorded data, an expression to predict the lateral strain-to-axial strain relationship for prestressed HSC-CFFTs is proposed. The comparison of the proposed model predictions with the experimental test results for specimens prepared with prestressed FRP tubes shows good agreement.

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Periodical:

Key Engineering Materials (Volume 729)

Pages:

134-138

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.729.134

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Online since:

February 2017

Authors:

Thomas Vincent*, Togay Ozbakkaloglu

Keywords:

Concrete, Concrete-Filled FRP Tube (CFFT), Confinement, Dilation, Fiber Reinforced Polymer (FRP), High-Strength Concrete (HSC), Prestress

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© 2017 Trans Tech Publications Ltd. All Rights Reserved

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