Effect of CFRP strengthening on response of RC columns to lateral static and impact loads

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Abstract

The paper presents results of an experimental study of twenty RC columns, with and without carbon fibre-reinforced polymer (CFRP) wrapping, subjected to the combined action of axial and transverse loads. To better understand how the rate of the transverse load application affects the behaviour of both unstrengthened and strengthened columns, half of the specimens were tested under transverse static loading, while the other half – under transverse impact loading. Six different configurations of CFRP layers were used to strengthen the specimens. The test results presented in the paper include the maximum transverse static and impact forces, load-deflection curves, time-histories of impact and reaction forces, deflections, strains, crack patterns and failure modes. Comparison between the results of the static and impact tests demonstrates that the resistance of the specimens to impact loading was significantly higher than that established in the case of static loading. The corresponding dynamic increase factor (DIF) had values mainly between 8 and 12.The results also show that CFRP strengthening can increase the resistance of RC columns to lateral static and impact loads. However, the increase depends strongly on the configuration of CFRP layers.
Original languageEnglish
Article number115356
JournalComposite Structures
Volume287
Early online date12 Feb 2022
DOIs
Publication statusPublished - 1 May 2022

Keywords

  • CFRP strengthening
  • Failure behaviour
  • Impact load
  • Lateral load
  • RC columns
  • Testing

ASJC Scopus subject areas

  • Ceramics and Composites
  • Civil and Structural Engineering

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