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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.
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