Shear and Flexural Strengths of Prestressed High-Performance Concrete Bridge Girders

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研究生：	Yang Qing Wei Mahendra - Denny Saputra
論文名稱：	Shear and Flexural Strengths of Prestressed High-Performance Concrete Bridge Girders Shear and Flexural Strengths of Prestressed High-Performance Concrete Bridge Girders
指導教授：	歐昱辰 Yu-Chen Ou
口試委員:	陳君弢 Chun-Tao Chen 林建宏 C.H. Lin
學位類別：	碩士 Master
系所名稱：	工程學院 - 營建工程系 Department of Civil and Construction Engineering
論文出版年：	2015
畢業學年度：	103
語文別：	英文
論文頁數：	243
中文關鍵詞：	prestressed beam 、newly developed materials 、HFHPC 、flexural strength 、shear strength
外文關鍵詞：	prestressed beam, newly developed materials, HFHPC, flexural strength, shear strength
相關次數：	點閱：243 下載：2
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The advancement of newly developed materials being utilized in several structures especially for SCC and HPC in bridge components is currently a trend. Many researchers conducted experiments to investigate either shear or flexural behavior of these materials. However the application of new development of HPC in bridge application is still seldom discussed. New development of HPC is HPC which is considered safe, durable, workable, economical and ecological. In this research new development of HPC is referred to HFHPC (High Flowability High Performance Concrete) because of its capability to flow freely filling the void between dense reinforcement.
This research is conducted to investigate the shear and flexural behavior of prestressed beam using newly developed material, especially focus on HFHPC. This research was conducted by two master’s degree students, therefore the data in this book is going to be same as another student (張艮瑋 / Zhang Gen Wei, Chinese version). However, this thesis focuses more on analytical study especially the applicability of current codes and equations for these newly developed materials (HFHPC, SCC, and HPLWC), verification of the test results is observed by collecting the database from previous experiments. The concrete compressive strengths of 6 ksi and 10 ksi are considered in this research to observe the effect of compressive concrete strength to the current design equations. The ultimate strength of the strands is 270 ksi. Longitudinal and transversal reinforcements with specified yield strengths of 40 ksi are used. This research observes: (1) the applicability of HFHPC in prestressed beam, (2) behavior of the beam with different kinds of materials, (3) the accuracy of the current codes and equations to predict the shear and flexural strength of the beam. The test results, they show that these newly developed materials are comparable to OPC in terms of ratio (V_(n,test)/V_(n,prediction)), even in some specimens exhibited a better performance than OPC. ACI and AASHTO are quite accurate to predict the flexural strength of prestressed beam with these materials. R2K shows the most accurate method to predict the shear strength based on these test results.

ABSTRACT	i
ACKNOWLEDGEMENT	ii
TABLE OF CONTENTS	iii
LIST OF TABLES	vi
LIST OF FIGURES	vii
NOTATION	xii
CHAPTER 1 INTRODUCTION	1
1.1 Background	1
1.2 Problem Statement	3
1.3 Research Significance	4
1.4 Objectives and Scopes	4
1.5 Outline	4
CHAPTER 2 LITERATURE REVIEW	6
2.1 High Performance Concrete (HPC)	6
2.1.1 Shear Behavior	6
2.1.2 Flexural Behavior	7
2.2 Self-Consolidating Concrete (SCC)	9
2.2.1 Shear Behavior	9
2.2.2 Flexural Behavior	11
2.3 Lightweight Concrete (LWC)	12
2.3.1 Shear Behavior	12
2.3.2 Flexural Behavior	13
2.4 Ordinary Portland Cement (OPC)	14
2.4.1 Shear Behavior	15
2.4.2 Flexural Behavior	17
2.5 Current Equations	18
2.5.1 Shear Strength	18
2.5.2 Flexural Strength	33
2.6 Development of HPC	34
CHAPTER 3 SPECIMEN DESIGN AND FABRICATION	37
3.1 Nomenclature	37
3.2 Cross Section	37
3.3 Mixture Proportions	40
3.4 Girder Fabrication	42
3.4.1 Mild Reinforcement	42
3.4.2 Concrete Pouring	45
3.4.3 Prestressing Steel	47
3.5 Test Setup	50
3.6 Instrumentation and Measurement of Load, Strain, and Displacement	53
CHAPTER 4 TEST RESULTS AND OBSERVATION	56
4.1 Material Strength	56
4.2 Test of The Specimens	58
4.2.1 Flexure Test	58
4.2.2 Shear Test	70
4.3 Test Results Comparison	82
4.3.1 Cracking Moment	82
4.3.2 Flexure Test	83
4.3.3 Shear Test	86
4.3.4 Database	93
4.3.4 Prestress Loss	100
4.3.5 Shear Strain, Curvature and Displacement	100
CHAPTER 5 CONCLUSIONS	106
REFFERENCES	109
APPENDIX A Specimen Design Drawing	113
APPENDIX B Sample Calculation	120
APPENDIX C Shear Strain and Curvature	124
APPENDIX D Database	129
APPENDIX E Strain Gauges Reading	145
APPENDIX F Crack Pattern	154
 

                                

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