抄録
Many empirical formulas have been proposed to evaluate the local damage incurred by reinforced concrete (RC) structures due to a rigid projectile impact. The majority of these formulas have been derived on the basis of impact tests performed perpendicular to the target structure; meanwhile, few impact tests performed at an oblique angle to the target structure have been reported. The overall objective of this study is to propose a new formula for evaluating the local damage to RC structures caused by an oblique impact, based on past experimental and simulation results. Thus far, we have validated an analytical method via comparison with experimental results and have conducted simulation analyses of oblique impact assessments on RC panels using rigid/soft projectiles with a flat nose shape utilizing the validated approach. Reduction coefficients were obtained for rigid/soft projectiles and 0°/45° impact angles. Therefore, in this study, we focus on impacts caused by rigid/soft projectiles with a hemispherical nose shape. In part 1 of this study, the same analytical method is applied to simulate the structural damage incurred by an RC panel due to a rigid projectile with a hemispherical nose shape. Results regarding the penetration depth of the RC structure and the energy contribution ratio are presented. By comparing the results of local damage to an RC structure caused by rigid projectiles with flat and hemispherical nose shapes, the influence of the nose shape of a rigid projectile on an RC panel subjected to an oblique impact is investigated.
