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研究生:林哲宇
研究生(外文):Lin, Zhe-Yu
論文名稱:施工縫對超高性能混凝土(UHPC)梁結構行為之影響
論文名稱(外文):The Effect of Construction Joints on the Structural Behavior of Reinforced Ultra-High Performance Concrete (UHPC) Beams
指導教授:阿力
指導教授(外文):Alexander B. Sturm
口試委員:阿力洪崇展洪瀞林冠中
口試委員(外文):Alexander B. SturmHung, Chung-ChanHung, ChingLin, Kuan-Chung
口試日期:2023-09-20
學位類別:碩士
校院名稱:國立成功大學
系所名稱:土木工程學系
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2023
畢業學年度:112
語文別:英文
論文頁數:112
中文關鍵詞:施工縫超高性能混凝土超高性能混凝土梁
外文關鍵詞:Construction jointUltra-high performance concrete (UHPC)Reinforced ultra-high performance concrete (UHPC) beam
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施工縫容易出現於多次澆置之結構,並影響其結構性能。目前,施工縫對傳統鋼筋混凝土梁之結構行為影響已被廣泛探討,但仍缺少超高性能混凝土梁相關之研究,特別是具有垂直施工縫之超高性能混凝土梁。因此,本研究使用三座超高性能混凝土梁進行四點彎曲試驗,以觀測不同施工縫對超高性能混凝土梁之影響。其中包含一座一體式澆置之無施工縫試體、一座於試體深度二分之一處具有水平施工縫之試體以及一座於試體跨度二分之一處具有垂直施工縫之試體。本試驗使用以位移為基準之分析法對試體進行分析,並對三座試體之強度、勁度、撓度、裂縫、滑移行為以及施工縫之開裂狀態進行觀測並討論。試驗中則配合數位影像量測系統(Digital Image Correlation)對各梁試體表面之應變分布情形進行觀察。
試驗結果顯示水平施工縫對於梁試體之延展性及勁度分別有7.4%以及18%之折減,但並未顯著影響梁試體之強度。而垂直施工縫對於梁試體之強度及勁度分別有7.5%以及15%之折減,但延展性則獲得54.5%之提升。
Construction joints occur when structures are constructed in multiple pours. The effects on the structural behavior of reinforced concrete beam caused by construction joint are researched widely, but there are a lack of published studies on reinforced ultra-high performance concrete (UHPC) beams, especially UHPC beams with vertical construction joints. Thus, three reinforced UHPC beam are fabricated and test under four-point bending test for the investigation of the effects on structural behavior that caused by different type of construction joints. Three beam specimens include one monolithic reinforced UHPC beam as control specimen, one reinforced UHPC beam specimen with horizontal construction joint at mid-height and one reinforced UHPC beam specimen with vertical construction joint at mid-span. Strength, stiffness, deflection, crack behavior, slippage and joint opening are observed and discussed in this study. Also, digital image correlation (DIC) is used to analysis the strain distribution of all specimens, and a displacement based analysis approach is applied to predict the structural behavior.
The results show specimen with horizontal construction joint has a 7.4% reduction in ductility and a 18% reduction in stiffness but no significant reduction in strength, and specimen with vertical construction joint has a 7.5% reduction in strength and 15% in stiffness but a 54.5% increase in ductility.
TABLE OF CONTENTS iv
LIST OF TABLES vi
LIST OF FIGURES vii
CHAPTER 1 1
INTRODUCTION 1
CHPATER 2 3
LITERATURE REVIEW 3
2.1 Ultra-High Performance Concrete 4
2.2 Ultra-High Performance Reinforced Concrete Beams 6
2.3 UHPC Beam with Vertical construction joint 9
2.4 RC Beam with horizontal construction joint 11
2.5 Digital image correlation in concrete members 13
2.6 Analysis approaches 14
CHAPTER 3 15
MATERIAL PROPERTIES AND SPECIMEN DESIGN 15
3.1 Material Properties 16
3.2 Specimen Design 22
CHAPTER 4 30
TEST SETUP 30
CHAPTER 5 38
TEST RESULTS 38
5.1 Test Results of Specimen WCJ 38
5.2 Test Results of Specimen HCJ 48
5.3 Test Results of Specimen VCJ 56
CHAPTER 6 66
DIC ANALYSIS 66
6.1 DIC Analysis of Specimen WCJ 66
6.2 DIC Analysis of Specimen HCJ 71
6.3 DIC Analysis of Specimen VCJ 76
CHAPTER 7 81
DISCUSSION 81
CHAPTER 8 94
ANALYSIS 94
8.1 Method 94
8.2 Material Properties Applied in Analysis Approach 103
8.3 Results 105
CHAPTER 9 108
CONCLUSION 108
REFERENCES 110
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