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Analysis of colliding index on impact behavior of RC columns under repeated impact loading

Tantrapongsaton, Warakorn; Hansapinyo, Chayanon; Wongmatar, Piyapong; Limkatanyu, Suchart; Zhang, Hexin; Charatpangoon, Bhuddarak

Authors

Warakorn Tantrapongsaton

Chayanon Hansapinyo

Piyapong Wongmatar

Suchart Limkatanyu

Bhuddarak Charatpangoon



Abstract

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

Journal Article Type Article
Acceptance Date Jun 7, 2022
Online Publication Date Jul 21, 2022
Publication Date 2022
Deposit Date Jul 21, 2022
Journal Computers and Concrete
Print ISSN 1598-8198
Peer Reviewed Peer Reviewed
Volume 30
Issue 1
Pages 19-32
DOI https://doi.org/10.12989/cac.2022.30.1.019
Public URL http://researchrepository.napier.ac.uk/Output/2891217