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研究生： 李立偉
Umi Saadah
論文名稱： 塗佈水性防火漆之鋼簡支樑火害行為研究
Fire Behavior of Simply Supported Beams with Water-Based Intumescent Fire-Resistance Mastic Coating
指導教授： 賴啟銘
Lai, Chi-Ming
學位類別： 碩士
Master
系所名稱： 工學院 - 土木工程學系
Department of Civil Engineering
論文出版年： 2023
畢業學年度： 111
語文別： 英文
論文頁數： 139
中文關鍵詞： 耐火性 、膨脹型塗料 、熱性能 、截面係數
外文關鍵詞： Fire-resistance, Intumescent coatings, Thermal behavior, Section factors
相關次數： 點閱：95  下載：1 
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    • 受保護鋼梁在火災荷載下的結構性能是結構工程研究的一個重要領域，特別是在耐火性是主要設計要求的結構中。 對鋼梁進行絕緣是為了防止其達到臨界溫度，這可能會導致其劣化並最終失效。 在此分析中，檢查了受保護鋼梁在與實驗數據相同的火災荷載下的熱性能，並與試驗結果進行了比較。 考慮了在火災荷載下影響受保護鋼梁結構性能的方面，以及用於確保其耐火性的程序。 為了模擬高溫實驗研究，使用商用軟件 ANSYS 創建了非線性三維有限元 (FE) 模型。 通過將數值解與實驗數據進行比較來驗證測試結果。 應將所有四個帶有簡單支撐樣本的受保護鋼梁相互比較，以便了解所有可能的情況。 之後，對樣品進行了測試，以確定它們的機械性能以及截面因素在高溫下如何影響它們。 結果在熱評估和機械評估之間建立了一致，可以表明調查期間結構條件是一致的。 對數值方法進行了驗證，傳熱模型能夠很好地模擬鋼梁在火災下的溫度分佈。 在參數分析中，截面係數非常相似的試樣具有幾乎相同的表面溫度分佈。

    The structural performance of protected steel beams under fire load is a significant area of research in structural engineering, particularly in structures where fire resistance is a primary design requirement. Insulating the steel beam intends to protect it from heating at a critical temperature, which could lead it to deteriorate and eventually fail. In this analysis, the thermal performance of the protected steel beam under the same fire load as the experiment data was examined and compared to the test findings. For the purpose of simulating high-temperature experimental studies, a nonlinear three-dimensional finite element model was created using the commercially available software ANSYS. The test results are validated by comparing the numerical solution to the experimental data. The total of four protected steel beams with simple support should be compared to one and the other in order to gain an understanding of all the possible scenarios. Following that, the samples were tested to determine how well they performed mechanically and how section factors affected them at high temperatures. The result established an agreement between the experimental and numerical evaluations that could indicate the thermal and structural conditions were consistent during the investigation period. The numerical method is verified, and the ANSYS model can well simulate the temperature distribution of steel beams under fire. In the parametric analysis, specimens with a remarkably similar section factor have a nearly identical surface temperature distribution. The temperature development of specimens is unaffected by the section height. However, an increase in section width results in a corresponding rise in temperature throughout the heating period.

    摘要 i SUMMARY ii ACKNOWLEDGEMENTS iii TABLE OF CONTENTS iv LIST OF TABLES vii LIST OF FIGURES viii NOMENCLATURE xi CHAPTER 1 INTRODUCTION 1 1.1 Motivation and Purpose 1 1.2 Literature Review 3 1.2.1 Fire Resistance and Related Standard for Fire Resistance Test 4 1.2.2 Steel Behaviors in Fire 10 1.2.3 Introduction to Fire Protection System 12 1.2.4 Intumescent Coatings 20 1.2.5 Defining Thermal Action 26 1.2.6 Advanced Calculation with Finite Element Simulation 30 1.3 Research Methodology 31 1.3.1 Research Scope 31 1.3.2 Thesis Structure 32 CHAPTER 2 THEORETICAL BACKGROUND 34 2.1 Material Properties of Steel According to Eurocode 34 2.2 Thermal Properties of Steel Element 37 2.2.1 Emissivity (ε) 37 2.2.2 Density (ρ) 38 2.2.3 Thermal Elongation (∆ll) 38 2.2.4 Specific Heat (ca) 39 2.2.5 Thermal Conductivity (λa) 40 2.2.6 Thermal Diffusivity (α) 41 2.2.7 Poisson’s Ratio 41 2.3 Thermal Exposure in Protected Steel Elements According to Eurocode 42 2.4 Key Parameters for Fire Protection of Steel Structures 43 2.4.1 Section Factors 43 2.4.2 Critical Temperature 45 CHAPTER 3 Methodology 46 3.1 Preliminary Analysis 47 3.1.1 The Selection of Specimens 47 3.1.2 Experiment Data Interpretation 49 3.2 ANSYS Finite Element Simulation 51 3.3 Numerical and Experimental Result Comparison 56 3.4 Parametric Study 56 3.4.1 Section Height 58 3.4.2 Section Width 58 CHAPTER 4 Results and Discussions 59 4.1 ANSYS Thermal Analysis 59 4.1.1 Temperature-Time History of SB1 59 4.1.2 Temperature-Time History of SB2 61 4.1.3 Temperature-Time History of SB3 62 4.1.4 Temperature-Time History of SB4 63 4.1.5 Thermal Behavior among the Specimens 63 4.2 ANSYS and Experiment Result Comparison 66 4.2.1 Temperature-Time Comparison of SB1 66 4.2.2 Temperature-Time Comparison of SB2 67 4.2.3 Temperature-Time Comparison of SB3 69 4.2.4 Temperature-Time Comparison of SB4 71 4.3 ANSYS Structural Analysis 74 4.3.1 Mechanical Behavior of SB1 74 4.3.2 Mechanical Behavior of SB2 79 4.3.3 Comparison of Mechanical Behavior between SB1 and SB2 82 4.4 Parametric Analysis 84 4.4.1 Section Height 85 4.4.2 Section Width 88 CHAPTER 5 CONCLUSION and FUTURE WORK 91 5.1 Conclusion 91 5.2 Future Work 92 REFERENCES 93 Appendix A TEMPERATURE-TIME HISTORIES OF SPECIMENS 98 A.1 Specimen SB1 98 A.2 Specimen SB2 110 A.3 Specimen SB3 122 A.4 Specimen SB4 130 Appendix B MECHANICAL PERFORMANCE 136 Appendix C Parametric Analysis 137 C.1 Section Height 137 C.2 Section Width 138

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