Impact simulations on local damage of reinforced concrete panel influenced by projectile nose shape

Abstract

Most impact research has been presented on the basis of impact tests and numerical analysis performed by rigid projectile impact perpendicular to the target structure. On the other hand, there are only few reports on impacts at an oblique angle. To evaluate more realistic conditions regarding issues related to oblique impacts to reinforced concrete (RC) structures, we have proposed an analytical method to estimate the local damage to RC structures by oblique impact and have validated the evaluation approach by comparison with experimental results. At present, we have finalized simulation analyses of oblique impact assessments on RC panels using rigid/soft projectiles with flat nose shape utilizing the validated approach. In this study, we focus on impacts caused by rigid/soft projectiles with hemispherical nose shape. The same analytical method is applied to simulate the structural damage of the RC panel due to rigid/soft projectile with hemispherical nose shape. Results on the penetration depth of the RC structure and the energy-contribution ratio are presented. By comparing the results of local damage to RC structure caused by projectiles with flat and hemispherical nose shapes, the influence of the nose shape of projectile on local damage of RC panel has been investigated.

Analytical study of perforation damage in reinforced concrete slabs subjected to oblique impact by projectiles with different nose shapes

“…For oblique impact, there is only a few experimental results available for research and Ohta et al (2017) developed a new formula to predict local damage induced by oblique impact of rigid projectile based on test data (Richard and Stipe, 1943) by means of integrating correction factors regarding projectile diameter, slip and rebound effects with the modified NDRC formula (Kennedy, 1976). Recently, simulation analysis for evaluation of the penetration and perforation damage to RC slabs subjected to oblique impact has been conducted and corresponding interpretation on analytical results has been provided in detail (Nishida et al, 2018(Nishida et al, , 2019Kang et al, 2019Kang et al, , 2020.…”