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研究生:黃青龍
研究生(外文):Hoang Thanh Long
論文名稱:高強度I形部分預力混凝土梁之剪力強度研究
論文名稱(外文):Study on the Shear Strength of Partially Prestressed High Strength Concrete I Beams
指導教授:黃世建黃世建引用關係徐增全徐增全引用關係
指導教授(外文):Hwang, Shyh-JiannThomas T. C. Hsu
口試委員:歐昱辰
口試委員(外文):Yu-Chen Ou
口試日期:2015-06-29
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:土木工程學研究所
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:2015
畢業學年度:103
語文別:英文
論文頁數:227
中文關鍵詞:高強度分預力混凝土
外文關鍵詞:Shear strengthpartially prestressed concrete beamhigh strength concrete
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Partial prestressing, which fills the gap between fully prestressed concrete and reinforced concrete, has now been accepted and becomes common practice in many countries. Partial prestressing has now been recognized as an intermediate case between full prestressing and conventional (nonprestressed) reinforcing. Compared with fully prestressed concrete (FPC) structures, adoption of partial prestressing may result in increased ductility and energy absorption capacity, improved economy, as well as reduction of the camber and creep deformation due to prestress. This research aims to solve one of the most troublesome problems in partially prestressed concrete (PPC) beam, namely the shear problem. In fact, there is no rational model at present to predict the shear behavior of prestressed concrete structures and the strength of shear failures. Although there were a lot of studies and researches about shear strength in FPC beams but not much research about PPC beams in the world. Because of this deficiency, all the shear design provisions, such as those in the ACI 318-14 [1] and AASHTO LRFD Specification- 2012 [2], are empirical, complicated and have severe limitations. In this research, four full- scale prestressed high strength concrete I-beams were tested to study the effect of number of prestressing tendons and amounts of flexural nonprestressed steel. The cross section, web reinforcement, flexural ultimate moment, and shear span ratio (a/d) were held constants. The numbers of prestressing tendons and amounts of non-prestressed tensile were varied. The prestressing factor was defined by this equation: . Ap and As are the cross sectional areas of prestressed steel and non-prestressed tensile steel; and are the yield strength of prestressed steel and non-prestressed tensile steel. The results from these tests, together with those found in literature, were used to help the engineers have an overview about the behavior of shear strength in partially prestressed high strength concrete beam.

ACKNOWLEDGEMENTS i
ABSTRACT ii
TABLE OF CONTENTS iii
LIST OF TABLES vi
LIST OF FIGURES viii
LIST OF NOTATIONS xv
CHAPTER 1 INTRODUCTION 1
1.1 Overview 1
1.2 Research Objectives 2
1.3 Organization of Thesis 3
CHAPTER 2 LITERATURE REVIEW 5
2.1 Shear Strength Parameters 5
2.2 Shear Provisions of ACI 318-14 Building Code 6
2.3 Shear Provisions of AASHTO LRFD 2012 Specifications 7
2.4 UH shear strength equation 9
2.5 Test of Lyngberg 10
2.6 Test of Elzanaty 13
2.7 Test of Rangan 14
CHAPTER 3 TEST PROGRAM 15
3.1 Introduction 15
3.2 Design of Specimens 15
3.3 Material Properties 23
3.3.1 Concrete 23
3.3.2 Steel 26
3.3.3 Applying prestressing force 26
3.3.4 Material test results 28
3.4 Test set up and instrumentation 33
CHAPTER 4 TEST RESULTS 38
4.1 Ultimate shear capacity 38
4.2 Angle of failure crack 41
4.3 Prestressing force 41
4.4 Failure and detail crack of specimens 44
4.4.1 Crack of specimen IH0 44
4.4.2 Crack of specimen IH1 52
4.4.3 Crack of specimen IH2 56
4.4.4 Crack of specimen IH3 61
4.5 Measured strain in reinforcement 67
4.6 Measured shear strain in concrete 90
4.6.1 Measured shear strain in concrete using LVDTs 91
4.6.2 Measured shear strain in concrete using NDI 97
CHAPTER 5 COMPARISIONS AND PROPOSAL NEW EQUATION 101
5.1 ACI Building Code 318-14 101
5.1.1 ACI method using simplified equation 101
5.1.2 ACI method using detailed equations 103
5.2 UH shear strength equation 106
5.3 AASHTO LRFD 2012 Provisions 107
5.4 Summary 109
5.5 Proposal first equation 112
5.5.1 Shear Model 112
5.5.2 Contribution of Steel 113
5.5.3 Contribution of Concrete 114
5.5.4 Applying new equation 114
5.6 Proposal second equation 117
5.6.1 Contribution of Steel 117
5.6.2 Contribution of Concrete 119
5.6.3 Applying new equation 119
CHAPTER 6 CONCLUSIONS 123
REFERENCES 124
APPENDIX CRACK GROWTH PHOTO 127


[1] ACI Committee 318 (2014), “Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (ACI 318R-14),” American Concrete Institute, Farmington Hills, MI.
[2] AASHTO (2012), “AASHTO LRFD 2012 Bridge Design Specifications 6th Ed (US)” American Association of State Highway and Transportation Officials (AASHTO), Washington, D. C.
[3] Laskar, A.,“Shear Behavior and Design of Prestressed Concrete Members,”PhD dissertation Department of Civil and Environmental Engineering, University of Houston, Houston, TX,2009.
[4] Laskar, A.; Hsu T. T. C.; and Mo, Y. L.,“Shear Strengths of Prestressed Concrete Beams Part 1:Experiments and Shear Design Equations,”ACI Structural Journal, V. 107, No.3, May-June 2010, pp.330-339.
[5] Hsu, T. T. C.; Laskar, A.; and Mo, Y. L., “Shear Strengths of Prestressed Concrete Beams Part 2: Comparisons with ACI and AASHTO Provisions,”ACI Structural Journal, V. 107, No.3, May-June 2010, pp.340-345.
[6] Lyngberg, B. S.,“Ultimate Shear Resistance of Partially Prestressed Reinforced Concrete I-Beams,”ACI JOURNAL, Proceedings V. 73, No.4, Apr. 1976, pp. 214-222.
[7] Hsu, T. T. C.; and Mo, Y. L., Unified Theory of Concrete Structures, John Wiley & Sons, Ltd, United Kingdom., 2010, pp. 356-380.

[8] Kuo, W. W.; Hsu T. T. C.; and Hwang S. J.,“Shear Strength of Reinforced Concrete Beams,”ACI Structural Journal, V. 111, No.4, July-August 2014.
[9] XTRACT v3.0.5 Release Notes, Imbsen Software System, TRC Bridge Design Software, Sacramento, CA., January 2006.
[10] 陳憲宏,「高強度I形部分預力混凝土梁之剪力強度研究」,碩士論文,國立台灣大學土木工程學系,台北,民國104年。
[11] Hsu, T. T. C. and Zhang, L. X. (1997), “Nonlinear Analysis of Membrane Elements by Fixed-Angle Softened-Truss Model,” ACI Structural Journal, Vol. 94, No. 5, pp. 483-492.
[12] Bhide, B. S. and Collins, M. P. (1989), “Influence of Axial Tension on Shear Capacity of Reinforced Concrete Members,” ACI Structural Journal, Vol. 86, No. 5, pp. 570-580
[13] Vecchio, F. J. and Collins, M. P. (1986), “The Modified Compression Field Theory for Reinforced Concrete Elements Subjected to Shear,” ACI Journal, Vol. 83, No. 2, pp. 219-231.
[14] Hsu, T. T. C. (1993), Unified Theory of Reinforced Concrete, CRC Press Inc., Boca Raton, FL.
[15] Pang, X. B. and Hsu, T. T. C. (1996), “Fixed-Angle Softened-Truss Model for Reinforced Concrete,” ACI Structural Journal, Vol. 93, No. 2, pp. 197-207.
[16] Elzanaty, A. H., Nilson, A. H., and Slate, F. O. (1986), “Shear Capacity of Prestressed Concrete Beams Using High-Strength Concrete,” ACI Journal, Vol. 83, No. 3, pp. 359-368.
[17] Rangan, B. V. (1991), “Web Crushing Strength of Reinforced and Prestressed Concrete Beams,” ACI Journal, Vol. 88, No. 1, pp. 12-16.
[18] ACI Committee 318 (1963), “Building Code Requirements for Structural Concrete (ACI 318-63) and Commentary (ACI 318R-63),” American Concrete Institute, Farmington Hills, MI.
[19] AASHTO (2007), “AASHTO LRFD Bridge Design Specifications,” 3th Ed.,
212 American Association of State Highway and Transportation Officials (AASHTO), Washington, D. C.
[20] ACI Committee 318 (1983), “Building Code Requirements for Structural Concrete (ACI 318-83) and Commentary (ACI 318R-83),” American Concrete Institute, Farmington Hills, MI.
[21] Loov, R. E. (2002), “Shear Design of Uniformly Loaded Beams,” Presented at the Sixth International Conference on Short and Medium Span Bridges, Vancouver, Canada, July 31 – August 2, 2002.
[22] Chen, W.C., Experimental Responses of Steel Reduced Beam Section to Weak Panel Zone Moment Connections, Master Thesis, Department of Civil Engineering, national Taiwan University, Taiwan, 1999, 120 pp. (in Chinese).


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