This paper presents an investigation into the failure of RC columns under impact loadings. A numerical simulation of 19 identical RC columns subjected to single and repeated impact loadings was performed. A free-falling hammer was dropped at midspan with the same total kinetic energy input but varying mass and momentum. The specimens under the repeated impact test were struck two times at the same location. The colliding index, defined as the impact energy-momentum ratio, was proposed to explain the different impact responses under equal-energy impacts. The increase of colliding index from low to high indicates the transition of the impact response from static to dynamic and failure mode from flexure to shear. This phenomenon was more evident when the column had a greater axial load and was impacted with a high colliding index. The existence of the axial load had an inhibitory effect on the crack development and increased the shear resistance. The second impact changes the failure mode from flexural to brittle shear as found in the specimen with 20% axial load subjected to high a colliding index. Moreover, a deflection prediction equation based on the impact energy and force was limited to the low colliding index impact.
Warakorn Tantrapongsaton — Department of Civil Engineering, Chiang Mai University, Thailand
Chayanon Hansapinyo, Piyapong Wongmatar — Excellence Center in Infrastructure Technology and Transportation Engineering, Department of Civil Engineering, Chiang Mai University, Chiang Mai, Thailand
Suchart Limkatanyu — Department of Civil Engineering, Prince of Songkla University, Thailand
Hexin Zhang — School of Engineering and the Built Environment, Edinburgh Napier University, 10 Colinton Road, Edinburgh, Scotland EH10 5DT, UK
Bhuddarak Charatpangoon — Excellence Center in Infrastructure Technology and Transportation Engineering, Department of Civil Engineering, Chiang Mai University, Chiang Mai, Thailand
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