Evaluation of local damage to reinforced concrete panels subjected to oblique impact - Simulation analysis for evaluating perforation phenomena caused by oblique impact of deformable projectiles -

Abstract

To date, oblique impact has not been studied and few experimental data on the local damage of reinforced concrete (RC) panels exist for oblique impact of deformable projectiles. The final purpose of this study is to propose a new formula for evaluating the local damage to reinforced concrete structures caused by oblique impact based on past experimental results and simulation results. As the first step of this final purpose, we validate the analytical method by comparison with the experimental results and simulate the damage caused by oblique impact using the validated method. First, we analyze and simulate the local damage of RC panel caused by a deformable projectile owing to an impact test normal to the target structure to verify the validity of the simulation analysis. Next, we perform simulation analyses for evaluating the perforation of RC panel due to oblique impact by the deformable projectile and present the results. Various response characteristics and perforation mechanisms to be the basis of examination of oblique impact evaluation were clarified in this paper.

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

“…Based on our previous work (Nishida et al, 2018(Nishida et al, , 2019, the proposed analytical method in terms of calibration analysis was validated by compared with the experimental results derived from the aforementioned small-scale impact tests (Fig. 2).…”

“…The comparison results indicated that the numerical results of total reaction force agreed well with test results. The detailed information for the calibration analysis is provided in Nishida et al (2018). Table 2 summarized the dimension of local damaged zone of RC slabs due to projectile impact.…”

“…(a) (b) Fig. 2 Comparison results of (a) displacement and (b) total reaction forces (Nishida et al, 2018).…”

“…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.…”

“…In this study, we use the same analytical method (Nishida et al, 2018) to investigate perforation damage to RC slabs subjected to oblique impact by rigid projectiles. We aimed at investigating the influence of different nose shapes between hemispherical and flat nose shape.…”