本研究利用 ANSYS 有限元素分析探討高強度鋼箱型柱（HBC-20-25）在地震作用下的耐震性能。研究採用三種循環載重協定（A、B、C），評估雙側與四側加勁肋配置對結構行為之影響，涵蓋彎矩承載力、剛度退化、Von Mises 應力分佈及等效塑性應變（PEEQ）等項目。模擬結果與 Chou 和 Chen（2020）之實驗數據進行驗證，並與 AISC 與 Eurocode 3 設計規範進行比較。研究發現，加勁肋對初始峰值強度影響適中，但在控制塑性變形、提升延展性及延緩高位移下局部破壞方面，其作用愈加關鍵。四側加勁肋配置在所有協定下表現皆優於雙側配置，其中在協定 B 與 C 下彎矩承載力分別提高約 26% 與 24%。Von Mises 應力分析揭示了早期局部屈曲現象，而 PEEQ 分析顯示塑性應變於四側加勁肋試體中受到更有效的限制。本研究強調加勁肋配置及載重協定對提升箱型柱耐震韌性的重要性。

This study investigates the seismic performance of high-strength steel box columns (HBC-20-25) using finite element analysis in ANSYS. Three cyclic loading protocols (A, B, and C) were applied to evaluate the effects of two-sided and four-sided stiffener configurations on structural behavior, including moment capacity, stiffness degradation, Von Mises stress distribution, and equivalent plastic strain (PEEQ). The results were validated against experimental data from Chou and Chen (2020) and compared with AISC and Eurocode 3 design provisions. The findings demonstrate that while stiffeners have a moderate effect on initial peak strength, their role becomes increasingly significant in controlling plastic deformation, improving ductility, and delaying local failure at larger drift levels. The four-sided stiffener configuration consistently outperformed the two-sided configuration, showing moment capacity improvements of up to 26% under Protocol B and 24% under Protocol C. Von Mises stress analysis revealed early local buckling, while PEEQ analysis confirmed that plastic strain was better confined in the four-sided stiffener specimens. The study underscores the role of stiffeners and loading protocols in enhancing the seismic resilience of box columns.

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