土壌と構造の相互作用と地面運動のパラメータが,RCビルの地震に対する脆弱性に与える影響
Pranoy Debnath1, Tanmoy Das1, Deepankar Choudhury2
1Department of Civil Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India.
Scientific reports
|February 17, 2026
まとめ
土壌と構造の相互作用 (SSI) は,鉄筋コンクリート (RC) 構造に大きく影響します. SSIを考慮すると,特に柔らかい土壌や断層付近の地震イベントで,地震設計のためのサイト固有の分析を強調する構造的移位と脆弱性の増加が明らかになります.
科学分野:
- ジオテクニカルエンジニアリング ジオテクニカルエンジニアリング
- 構造工学 構造工学とは
- 地震工学は,地震工学である.
背景:
- 鉄筋コンクリート (RC) 構造物の地震性能は,土壌構造相互作用 (SSI) によって著しく影響を受けます.
- SSIの影響は,土壌の特性,基礎の柔軟性,および地震の投入に依存しています.
- SSIを理解することは,正確な地震の脆弱性評価に不可欠です.
研究 の 目的:
- 明確なSSIを考慮して5階建てRCフレーム構造の地震反応と脆弱性を調査する.
- 横の移動,階層間の漂流,および地震の脆弱性に対するSSIの影響を評価する.
- 地震反応をシミュレートするために,異なる土壌構成モデルを比較する.
主な方法:
- 構造と土壌の相互作用をシミュレートするために,PLAXIS3Dで3次元数値モデルの開発.
- 粘土土のモール・クーロンブ (MC) モデルと,砂土のHSS (Hardening Soil model with small-strain stiffness) モデルを利用した.
- 壊れやすい曲線の生成は,近断層と遠断層の両方の地面運動を使用します.
主要な成果:
- HSSモデルは,MCモデルと比較して,砂土の地震反応を把握する上で優れた精度を示した.
- SSIは,特に柔らかい粘土土と柔軟な基礎で,横の移動と階層間の漂移を増加させることができます.
- 結合されたSSIと近断層地面運動は,より低いピーク地面加速 (PGA) レベルでの損傷状態を上回る確率を高めます.
結論:
- SSIは,RC構造の地震反応と脆弱性に大きな影響を与えます.
- SSIの影響はシナリオに依存しており,サイト特有の土壌条件の必要性を強調しています.
- 現実的なSSIモデリングを組み込むことは,パフォーマンスベースの地震設計と脆弱性評価に不可欠です.
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