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研究生：	德銘理 Mpendulo Ntando Dlamini
論文名稱：	高強度鋼筋之搭接握裹強度於超高性能混凝土梁 Bond Strength of Spliced High Strength Steel Reinforcing Bars in Ultra-High Performance Concrete (UHPC) Beams
指導教授：	洪崇展 Hung, Chung-Chan
共同指導教授:	Remy Lequesne Remy Lequesne
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：	2021
畢業學年度：	109
語文別：	英文
論文頁數：	128
中文關鍵詞：	高強度鋼、高性能混凝土梁、搭接握裹強度
外文關鍵詞：	Ultra-high performance concrete(UHPC), high strength steel(HSS), splice length, bond strength
相關次數：	點閱：178 下載：22
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Several studies on tension lap splices have proved that using Ultra-high performance concrete (UHPC) improves the bond between reinforcement and the concrete. The high bond strength of UHPC is an effective solution to reduce the required development length or splice length for steel reinforcing bars. The bond strength and development length of reinforcing bars in UHPC have been commonly assessed using direct pullout tests. Such methods however may not completely reproduce the stress field experienced by the flexural reinforcement in beams and hence should not be used as a sole basis for determining the bond strength. The current study investigated the bond strength of high strength steel (HSS) bars in Ultra-high performance concrete (UHPC) using four point loading tests on lap splice UHPC beams. The experimental variables included the bar size, type of concrete, steel fiber volume content, and splice length. Fourteen tension-spliced beams were constructed and tested. Two different types of concrete mix was used, high strength concrete (HSC) and Ultra-high performance concrete with 2% and 0.75% fiber volume content. #8(D25)-SD685 and #5(D16)-SD785 high strength tension spliced bars with 1.5d_b concrete cover was used for this study. Crack pattern, crack propagation, ultimate load, midspan span deflection and reinforcement strain was recorded and analyzed to study the mentioned parameters effect.

TABLE OF CONTENTS	II
LIST OF FIGURES	VI
LIST OF TABLES	IX
ABSTRACT	X
CHAPTER 1	1
INTRODUCTION	1
1	Research Motivation	1
2	Research Objectives	1
3	Research Method	2
CHAPTER 2	3
LITERATURE REVIEW	3
1	Ultra-high performance concrete (UHPC)	3
2	Bond Interaction between steel and concrete	4
3	Bond influencing factors	5
3.1	Bar geometry	5
3.2	Concrete properties	7
3.3	Presence of confinement	9
3.4	The volume of concrete around rebars	10
4	Test Methods	11
5	Bond strength	12
5.1	UHPC beams bond strength estimation	15
5.2	High Strength Concrete Bond Estimation	18
6	Introduction of Bond Strength Models	20
6.1	ACI 318-19	20
6.2	Orangun, Jirsa, and Breen [11, 39]	23
6.3	Zuo and Darwin (1998) [23, 40]	23
6.4	fib Model Code (2010) [25, 41]	25
6.5	ACI 408R-03 [42]	26
CHAPTER 3	27
EXPERIMENTAL METHODS	27
1	Introduction	27
2	Design of Beam Specimens	27
3	Beam Notation	30
4	Beam Strength Design	33
4.1	Nominal Strength	33
4.2	Shear Strength	34
5	Fabrication of Reinforcement Cage	36
6	Proportioning and Mixing of UHPC and HSC	41
7	Instrumentation and Testing	44
7.1	Digital Image Correlation (DIC)	47
8	Material Testing and Properties	49
8.1	Reinforcing bars	49
8.2	UHPC Compressive Strength	52
8.3	UHPC direct tensile strength	52
CHAPTER 4	54
RESULTS	54
1	Introduction	54
2	Material Properties Testing	54
2.1	UHPC Compressive Strength	54
2.2	UHPC Tensile Strength	58
3	Beam Test Results	63
3.1	#8(D25) Lap-spliced Beams Experimental Results	65
3.1.1	Beam B8-F200-120	65
3.1.2	Beam B8-F200-90	67
3.1.3	Beam B8-F200-60	69
3.1.4	Beam B8-F75-120	71
3.1.5	Beam B8-F75-90	73
3.1.6	Beam B8-F75-60	75
3.1.7	Beam B8 –HSC-120	77
3.2	#5(D16) Lap-spliced Beams	80
3.2.1	Beam B5-F200-70	80
3.2.2	Beam B5-F200-50	82
3.2.3	Beam B5-F200-30	84
3.2.4	Beam B5-F75-70	87
3.2.5	Beam B5-F75-50	89
3.2.6	Beam B5-F75-30	91
3.2.7	Beam B5-HSC-70	93
CHAPTER 5	97
DISCUSSIONS	97
1	Introduction	97
2	Beams Failure Mode and Crack Pattern	97
3	Beam Deflection	100
4	Flexural Strength	102
5	Maximum Bar Stress	105
6	Bond Strength	106
6.1	Effect of Splice Length	108
6.2	Effect of Fiber Content	109
6.3	Effect of Bar Size	110
6.4	Effect of Concrete Type	111
7	Comparison with Models	112
8	Bond strength calculation methods comparison	116
9	Beam Ductility	118
9.1	Displacement Ductility	118
9.2	Section Ductility	119
CHAPTER 6	122
SUGGESTIONS	122
CHAPTER 7	123
CONCLUSIONS	123
REFERENCES	125
                                    

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