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研究生： 王冠貿
Wang, Guan-Mao
論文名稱： 尺寸對於超高性能纖維混凝土測定拉伸性質之影響
The Effect of Size on the Measured Tensile Properties of Ultra-High Performance Fibre-Reinforced Concrete
指導教授： 阿力
Sturm, Alexander
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： 2024
畢業學年度： 112
語文別： 英文
論文頁數： 133
中文關鍵詞： 直接拉伸試驗 、超高性能纖維混凝土 、尺寸效應 、拉伸性質 、狗骨頭試體
外文關鍵詞： Direct tension test, Size effect, Dogbone specimen, Tensile properties, UHPFRC
相關次數： 點閱：61  下載：7 
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    • 本研究探討了尺寸對超高性能纖維混凝土（UHPFRC）拉伸性能測試結果的影響。本試驗測試了45個狗骨頭形狀試體，採用擬靜態加載的直接拉伸方法進行測試。研究中製備並測試了三種不同尺寸的試件，其橫截面尺寸分別為35 mm × 35 mm（小尺寸）、80 mm × 80 mm（中尺寸）和120 mm × 120 mm（大尺寸）。此外，考慮了13 mm短直鋼纖維和35 mm長端鉤鋼纖維。研究關注於纖維體積、纖維類型和試件尺寸對於峰值拉伸強度以及在裂縫寬度為0.5 mm和1.5 mm時的殘留拉伸強度的影響。試驗結果顯示出明顯的尺寸效應，額外採用了Bazant尺寸效應定律和Weibull理論來討論尺寸效應，並且提出了關於UHPC的尺寸效應。最後，提供了關於如何校正試件尺寸對於直接拉伸測試結果的指引。

    The size effect on the measured tensile properties of ultra-high performance fibre reinforced concrete (UHPFRC) was investigated. A total of 45 dogbone specimens were tested by the direct tension method under quasi-static loading. In this study, three different size specimens with a cross-sectional dimension of 35 mm 35 mm (small), 80 mm 80 mm (medium) and 120 mm 120 mm (large) were fabricated and tested. In addition, the 13 mm short straight fibre and 35 mm long hooked-end fibre were also considered. The peak tensile strength and residual tensile strength at crack widths of 0.5 mm and 1.5 mm were investigated with a focus on fibre volume, fibre type and specimen size. From this, an obvious size effect was observed. The Bazant size effect law and Weibull theory were both used to investigate this size effect to propose a size effect law for UHPC. Guidance is then provided for correcting the direct tension results for specimen size.

    ABSTRACT i 中文摘要 ii ACKNOWLEDGMENT iii TABLE OF CONTENTS iv LIST OF TABLES vi LIST OF FIGURES viii CHAPTER 1 INTRODUCTION 1 1.1 Motivation and objective 1 1.2 Method 2 CHAPTER 2 LITERATURE REVIEW 3 2.1 Ultra-high performance concrete (UHPC) 3 2.1.1 Ultra-high performance concrete 3 2.1.2 Ultra-high performance fibre-reinforced concrete 3 2.2 Steel fibre-reinforced concrete 5 2.2.1 Mechanical properties of SFRC 5 2.3 UHPC direct tension test (DDT) 11 2.3.1 Characterization of UHPC tensile behaviour 11 2.3.2 Larger dogbone specimens 17 2.4 Size effect 24 2.4.1 Size effect 24 2.4.2 Size effect for UHPC prism tests 29 2.4.3 Size effect of UHPFRC direct tension tests 32 2.5 Recommendations and standard for UHPC direct tension tests 36 2.5.1 AS3600-2018 36 2.5.2 JSCE 38 2.5.3 FHWA-HRT-17-053 38 2.6 Summary 40 CHAPTER 3 EXPERIMENTAL PROJECT 43 3.1 Specimen design 43 3.1.1 Shape of specimen 43 3.1.2 Designation 45 3.2 Material and mixture proportion 47 3.2.1 Material 47 3.3.2 Mixture proportion 52 3.3 Specimen preparation 52 3.3.1 Preliminary preparation 52 3.3.2 Casting 54 3.3.3 Demolding and curing 55 3.4 Test setup 56 3.4.1 Instrumentation 56 3.4.2 Apparatus 59 3.4.3 External measurement 60 3.5 Test procedure 61 CHAPTER 4 RESULTS 62 4.1 Analysis method 62 4.2 Cylinder compression test 63 4.3 Direct tension test 65 4.3.1 S13-1 series 65 4.3.2 S13-2 series 70 4.3.3 S13-3 series 75 4.3.4 H35-1 series 80 4.3.5 H35-2 series 85 CHAPTER 5 DISCUSSION 90 5.1 Comparison of the effect of fibre volume fraction 90 5.1.1 Tensile strength 90 5.1.2 Stress-crack width relationship 91 5.2 Comparison of the effect of fibre type 92 5.2.1 Tensile strength 92 5.2.2 Stress-crack width relationship 95 5.3 Comparison of the effect of specimen size 96 5.3.1 Tensile strength 96 5.3.2 Stress-crack width relationship 98 5.3.3 Linear size effect law 99 5.3.4 Weibull theory 104 5.3.5 Bažant size effect law 107 CHAPTER 6 CONCLUSION 111 CHAPTER 7 REFERENCE 113 CHAPTER 8 APPENDIX 117

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