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

飛翔体先端形状による鉄筋コンクリート版の局部損傷への影響評価に関する衝突シミュレーション

Kang, Z.; 西田 明美; 奥田 幸彦; 坪田 張二; Li, Y.

Kang, Z.; Nishida, Akemi; Okuda, Yukihiko; Tsubota, Haruji; Li, Y.

飛翔体の衝突に伴う構造物の局部破壊については、構造物に対して垂直に衝突する研究が主であり、斜め衝突に関する研究はほとんど行われていないのが現状である。本研究では、実験結果および解析結果に基づき飛翔体の斜め衝突に対する評価式を提案することを最終目的とする。これまでに、実験結果との比較により解析手法の妥当性を確認するとともに、妥当性が確認された解析手法を用いて、先端形状が円筒型の剛・柔飛翔体の衝突を受ける鉄筋コンクリート(RC)版の局部損傷評価について検討してきた。本稿では同様の解析手法を用いて、先端形状が半球型・円筒型の剛・柔飛翔体の斜め衝突によるRC版の局部損傷評価結果を分析し、飛翔体の先端形状の違いによるRC版の局部損傷への影響評価について得られた知見を報告する。

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 an 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 a flat nose shape utilizing the validated approach. Furthermore, in this study, we focus on impacts caused by rigid/soft projectiles with a hemispherical nose shape. The same analytical method is applied to simulate the structural damage caused by an RC panel due to a rigid/soft projectile with a 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 an RC structure caused by projectiles with flat and hemispherical nose shapes, the influence of the nose shape of the projectile on local damage of the RC panel has been investigated.

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