本研究旨在深入探討 H 型鋼梁與混凝土填充鋼管(Concrete-Filled Steel Tube, CFST)柱接頭在常溫及火害環境下的力學行為與破壞機制。隨著結構安全標準的提升，CFST因具備高承載力與優異韌性而廣泛應用，然而其接頭構造在極端火場下的熱力耦合反應仍是工程設計上的重要挑戰。本研究採用 ANSYS 有限元素分析軟體建立非線性數值模型，探討有無填充混凝土、有無橫隔板配置以及有無火害加溫作用等關鍵參數的影響。
在分析程序中，本研究導入標準升溫曲線並考量材料隨溫度變化之非線性關係，涵蓋鋼材降伏強度折減、彈性模數衰減以及混凝土之熱力劣化特性。透過對溫度場分布與熱應力之模擬，本研究探討了填充混凝土在常溫下對接頭剛度之提升作用，以及在受火過程中對鋼管壁面局部挫屈之抑制效應；同時，針對橫隔板在傳遞彎矩與剪力過程中的關鍵角色，研究剖析了其在高溫軟化狀態下維持接頭轉動能力與韌性之重要性。
研究結果顯示，填充混凝土不僅在常溫下能顯著提升接頭之初始剛度與承載能力，在火害環境下更具備延緩鋼管局部挫屈之功能，對於維持結構之耐火極限具有正面貢獻。此外，橫隔板的設置能有效改善應力在接頭區的傳遞路徑，減輕高溫下材料軟化所導致的剛度退化現象。透過參數化分析，本研究評估了不同構造形式在火害作用下的殘餘強度與失效模式演變，釐清了熱力耦合效應對接頭的力學行為。綜上所述，本研究透過對材料填充、構造配置與溫度環境的多維度比較，建構了 H 型鋼梁與混凝土填充鋼管柱接頭在複雜受力狀態下的力學行為體系。

This study investigates the mechanical behavior and failure mechanisms of H-shaped steel beam to Concrete-Filled Steel Tube (CFST) column connections under both ambient and fire conditions. As structural safety standards rise, CFST components are widely utilized for their high load-bearing capacity and ductility; however, the thermo-mechanical coupling of their connections in extreme fire scenarios remains a significant engineering challenge. Utilizing ANSYS finite element software, this research establishes non-linear numerical models to examine key parameters, including concrete filling, diaphragm configuration, and fire-induced heating. The analysis incorporates standard fire curves and temperature-dependent material non-linearity, accounting for steel strength reduction, elastic modulus decay, and concrete thermal degradation.
The results indicate that concrete filling significantly enhances initial stiffness and capacity at ambient temperatures and delays local buckling of the steel tube during fire, contributing positively to fire resistance limits. Furthermore, through-diaphragms effectively optimize stress transfer paths and mitigate stiffness degradation caused by material softening at high temperatures. By integrating multi-dimensional comparisons of material filling, structural configuration, and thermal environments, this study constructs a comprehensive framework for understanding the mechanical behavior of H-beam to CFST column connections under complex loading states.

1. AISC, Seismic Provisions for Structural Steel Buildings. 2016.
2. ANSYS, ANSYS Contact Technology Guide. SAS, 2007.
3. ASCE, Structural fire protection. 1992.
4. BSI, Structure Use of Steelwork in Building: Part , Code of Pratice for Fire Resistance Design. British Standard Institution, 1990.
5. Cho, Y. H., Wang, F., Seo, S.Y., Lee, K., & Kim, T. S.(2024). Experimental and numerical investigation of through-diaphragm in H-shaped steel beam to CFST column connections. Thin-Walled Structures, 199, 111852.
6. Eurocode 3, Design of steel structures - Part 1-2: General rules - Structural fire design. 2005.
7. Eurocode 4, Design of steel structures - Part 1-2: General rules - Structural fire design. 2009.
8. Hong S., Varma A. H. (2009). Analytical modeling of the standard fire behavior of loaded CFT columns. Journal of Constructional Steel Research, Volume 65, Issue 1, 54-69.
9. Huang, Z.-F., Tan, K.-H., Toh, W.-S., and Phng, G.-H. (2008). Fire resistance of composite columns with embedded I-section steel - Effects of section size and load level. Journal of Constructional Steel Research, 64, 312-325.
10. Kodur, V. K. R. (2010). High-temperature properties of steel for fire resistance modeling of structures. Journal of material in Civil Engineering, ASCE, 22(5), 423-434.
11. Li, L. Y., and Purkiss, J. (2005). Stress-strain constitutive equations of concrete material at elevated temperatures. Fire Safety Journal, 40(7), 669-686.
12. Pallett, P., Gorst, N., Clark, L., &Thomas, D. (2002). Friction resistance in temporary works materials. Concrete, 36, 12-15.
13. Peng, Z., Dai, S. Bi. Y. Y. Zhang, Y. C.. & Huang, J.(2018). Seismic performance of end-plate connections between T-shaped CFST columns and RC beams. Journal of Constructional Steel Research, 145, 167-183.
14. Qing-Hua Tan, Lin-Hai Han, Hong-Xia Yu(2012). Fire performance of concrete filled steel tubular (CFST) column to RC beam joints. Fire Safety Journal, Volume 51, 68-84.
15. Rong, B., Zhang, Y Sun, J., & Zhang, R. (2022). Experimental and numerical research on hysteretic behavior of CFST frame with diaphragm-through connections. Journal of Building Engineering, 45, 103529.
16. Tong, L.-W., Huang, J.-F., Wu, H.-L., Wang, K.-Y., Dong, B.-P. (2022). Experimental behavior of steel-beam to flat rectangular CFST column connections with small-sized external diaphragms. Journal of Constructional Steel Research, 198, 107520.
17. Wang, N., Kim, K.-H., & Lee, M.-J. (2017). Structural behavior of beam-to-column connections of rectangular CFST columns using mixed diaphragms. International Journal of Steel Structures, 17, 351–365.
18. 康欣愉(2022)，梁腹橫向開孔鋼梁柱接頭耐震與耐火行為研究，國立成功大學土木工程研究所碩士論文。
19. 張家誠(2025)，橫隔板型式與填充混凝土對於鋼梁柱接頭耐震性能影響，國立成功大學土木工程研究所碩士論文。
20. 陳柏端(2021)，高溫下混凝土構件之熱傳數值分析，內政部建築研究所自行研究報告。
21. 陳誠直、趙文成等人(2011)，鋼骨鋼筋混凝土高溫材料性質之研究，內政部建築研究所委託研究報告。
22. 賴品蓁(2023)，塗佈水性防火漆之鋼梁柱接頭防火安全研究，國立成功大學土木工程研究所碩士論文。