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論文中文名稱:以有限元素及理論分析進行FRP人行橋力學行為之研究 [以論文名稱查詢館藏系統]
論文英文名稱:Finite Element Analysis and Theoretical Analysis of All-FRP Composite Pedestrian Bridge [以論文名稱查詢館藏系統]
院校名稱:臺北科技大學
學院名稱:工程學院
系所名稱:土木與環境工程國際學生研究所專班
畢業學年度:102
出版年度:103
中文姓名:Sainey
英文姓名:Sainey Badjie
研究生學號:101a98007
學位類別:碩士
語文別:英文
口試日期:2014-06-16
論文頁數:91
指導教授中文名:李有豐
口試委員中文名:陳清泉;徐增興;邱佑宗
中文關鍵詞:all-FRP compositepedestrian bridgefinite element analysisANSYS
英文關鍵詞:all-FRP compositepedestrian bridgefinite element analysisANSYS
論文中文摘要:This thesis presents the finite element analysis (FEA) and theoretical analysis of the first all-FRP-composite pedestrian bridge in Taiwan. The bridge was constructed in Taijiang National Park, Tainan, where salt damage is causing severe structural degradation. Fiber Reinforced Polymer (FRP) composite material was used to build the bridge as a countermeasure to chloride attack. The superstructure of the bridge consists of four FRP I-girders as the bridge stringers, the deck and diaphragms. Diaphragms and FRP rods placed between the girders helped dissipate the loading to the other girders and prevent torsion respectively. This design enhanced the stiffness of the FRP composite bridge super-structure as well as allowed for the best performance of each component.
A 6-m girder was tested by using three-point bending test. Timoshenko Beam Theory (TBT), Euler Bernoulli Beam Theory (EBT) and the FEA were also used to analyze and compare the test results. In the meantime, the TBT, EBT and FEA (using ANSYS) were used to analyze an 8-m girder of the pedestrian bridge for validation of the finite element model. A detailed finite element model was then created to predict the static flexural behavior of the bridge superstructure under service live loads and also possible failure initiation points on the superstructure.
The theoretical results show a good correlation with the finite element results in predicting the static behavior of the pedestrian bridge under the designed live load. The pedestrian bridge met deflection criteria of a maximum deflection less than L/500. From the finite element results, the stress concentrated points were identified on the pedestrian bridge superstructure. These points, also known as the critical points, were found to be located at midspan the top and bottom of the girders; at the support points; slightly on the deck bottom at midspan; and around the support and diaphragm connection on the girders.
論文英文摘要:This thesis presents the finite element analysis (FEA) and theoretical analysis of the first all-FRP-composite pedestrian bridge in Taiwan. The bridge was constructed in Taijiang National Park, Tainan, where salt damage is causing severe structural degradation. Fiber Reinforced Polymer (FRP) composite material was used to build the bridge as a countermeasure to chloride attack. The superstructure of the bridge consists of four FRP I-girders as the bridge stringers, the deck and diaphragms. Diaphragms and FRP rods placed between the girders helped dissipate the loading to the other girders and prevent torsion respectively. This design enhanced the stiffness of the FRP composite bridge super-structure as well as allowed for the best performance of each component.
A 6-m girder was tested by using three-point bending test. Timoshenko Beam Theory (TBT), Euler Bernoulli Beam Theory (EBT) and the FEA were also used to analyze and compare the test results. In the meantime, the TBT, EBT and FEA (using ANSYS) were used to analyze an 8-m girder of the pedestrian bridge for validation of the finite element model. A detailed finite element model was then created to predict the static flexural behavior of the bridge superstructure under service live loads and also possible failure initiation points on the superstructure.
The theoretical results show a good correlation with the finite element results in predicting the static behavior of the pedestrian bridge under the designed live load. The pedestrian bridge met deflection criteria of a maximum deflection less than L/500. From the finite element results, the stress concentrated points were identified on the pedestrian bridge superstructure. These points, also known as the critical points, were found to be located at midspan the top and bottom of the girders; at the support points; slightly on the deck bottom at midspan; and around the support and diaphragm connection on the girders.
論文目次:ABSTRACT i
ACKNOWLEDGEMENTS iii
TABLE OF CONTENTS iv
LIST OF TABLES vii
LIST OF FIGURES viii
CHAPTER 1 INTRODUCTION 1
1.1 Background and Problem Statement 1
1.2 Objective 4
1.3 Scope 5
1.4 Significance 5
CHAPTER 2 LITERATURE REVIEW 7
2.1 Related Review 7
2.2 Case Studies of FRP Bridges 11
2.2.1 Case Studies in U.S. 11
2.2.2 Case Studies in Europe 15
2.2.3 Case Studies in Asia and Australia 23
CHAPTER 3 FRP COMPOSITE MATERIAL 27
3.1 Overview of FRP Composite 27
3.2 Importance of FRP Composite 28
3.3 Material Composition 29
3.3.1 Matrix 30
3.3.2 Fibers 31
3.4 Manufacturing Process (Pultrusion) 32
3.5 Material Properties 33
CHAPTER 4 DESIGN OF THE PEDESTRIAN BRIDGE 36
4.1 Aesthetic Design 36
4.1.1 Bridge Type 36
4.1.2 Girders 37
4.1.3 Handrails 38
4.1.4 Finishing and Overlay 38
4.1.5 Information Board 38
4.1.6 Abutment 39
4.1.7 Assembly and Installation 39
4.2 Structural Design 40
4.2.1 Pedestrian Live Load 40
4.2.2 Deflection Requirement 40
4.2.3 Connections 42
CHAPTER 5 THEORETICAL ANALYSIS 44
5.1 Timoshenko Beam Theory 44
5.2 Euler Bernoulli Beam Theory 46
CHAPTER 6 NUMERICAL ANALYSIS 47
6.1 Material Constitutive Model 47
6.2 Failure Theory 49
6.2.1 Combined Stress 49
6.2.2 Tsai Wu Failure Criteria 50
6.2.3 Maximum Stress Failure Criteria 51
6.3 Finite Element Analysis 52
6.3.1 Element Types 52
6.3.2 Model 52
6.3.3 Loads 54
6.4 The 8-m Girder 54
6.5 Girder-deck system 56
CHAPTER 7 RESULTS AND DISCUSSION 59
7.1 Results of 8-m girder 60
7.2 Results of girder-deck system 62
7.3 Failure Prediction 64
7.3.1 Full Surface Loading Condition 65
7.3.2 Torsional Loading Condition 70
CHAPTER 8 CONCLUSIONS 75
REFERENCES 76
APPENDIX – ANSYS Code 81
List of Symbols 88
List of Notations 90
VITA 91
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論文全文使用權限:同意授權於2014-08-07起公開