臺灣博碩士論文加值系統

This study is conducted to investigate the shear strength of FRP-Wrapped Spiral Corrugated Tube (FWSCT) confined circular concrete columns. In order to study the shear strength of the Spiral Corrugated Tube and the FRP jacket, two shear strength models (UCSD shear model and residual shear model) are adopted in this analytical procedure.
In this experimental program, two FRP-Wrapped Spiral Corrugated Tube (FWSCT) Circular Concrete Columns with different amount of FRP confinement were tested under cyclic lateral loading with a constant axial load level. The main variable was the confinement ratio of the FRP jacket, which can be controlled by wrapping different number of FRP sheets around the Spiral Corrugated Tube. Two columns, FWSCT-1 and FWSCT-3 were designed based on a reference column, FWSCT-0 (Wu 2015), which confined by only a spiral corrugated tube with 0.4 mm thick and 1940 mm tube length. FWSCT-1 and FWSCT-3 were wrapped by additional one-layer and three-layer of Glass Fiber-Reinforced Polymer (GFRP) jackets around a spiral corrugated tube, respectively. Test results showed that the brittle shear failure in specimen FWSCT-0 is improved by wrapping one-layer of the GFRP jacket as seen in the test of specimen FWSCT-1. Specimen FWSCT-1 failed at 4% story drift, resulting in flexural-shear failure of column, while specimen FWSCT-3 failed at 7% story drift, resulting in flexural failure of longitudinal bars.

TABLE OF CONTENTS
SIGNATURE PAGE i
ACKNOWLEDGMENTS ii
ABSTRACT iii
TABLE OF CONTENTS iv
List of Tables viii
List of Figures ix
List of Photos xii
Chapter 1 Introduction 1
1.1 General 1
1.2 Background 1
1.3 Problem Statement 2
1.4 Research Objective 3
Chapter 2 Literature Review 4
2.1 Constitutive Relationships of Confined Concrete 4
2.1.1 Concrete with Steel-confinement 5
2.1.2 Concrete with FRP-confinement 5
2.1.3 Concrete with FRP Wrapped Spiral Corrugated Tube (FWSCT)-Confinement 7
2.2 Seismic Tests on Confined Concrete Columns 8
2.2.1 Columns with Steel-Confinement 8
2.2.2 Columns with FRP-confinement 9
2.3 Code Provisions and Analytical Models for Shear Strength Design 13
2.3.1 Nominal Shear Capacity for Normal Reinforced Concrete Column 13
2.3.2 FRP Jacket Shear Strength Contribution, 16
2.4 Shear Strength Analysis of FWSCT columns 19
Chapter 3 Experimental Program 21
3.1 General 21
3.2 Design of Specimens 21
3.2.1 Analysis Program 22
3.2.2 Confined-Concrete Model 22
3.2.3 Moment-Curvature Analysis 24
3.2.4 Load-Displacement Analysis 27
3.2.5 Flexural and Shear Strength Prediction 29
3.2.6 Plastic Hinge Length 29
3.2.7 Shear Strength Prediction 30
3.3 Details of Column Specimens 31
3.3.1 Concrete 32
3.3.2 Steel Reinforcement 32
3.3.3 Spiral Corrugated Tube 33
3.3.4 Fiber-Reinforced Polymer 33
3.4 Construction of Specimens 34
3.4.1 FRP Wrapping 34
3.4.2 Reinforcing Cages 36
3.4.3 Formwork 37
3.4.4 Casting of Concrete 37
3.5 Instrumentation 38
3.5.1 Strain Gauges 38
3.5.2 Linear variable differential transformers (LVDT) and Dial Gauge 40
3.5.3 Motion Capture System (NDI) 40
3.6 Testing 41
3.6.1 Test Setup 41
3.6.2 Testing Procedure 42
Chapter 4 Experimental and Analytical Results 43
4.1 Test Results 43
4.1.1 Material Test Results 43
4.1.2 Test Observations 45
4.1.3 General Behavior and Lateral Force-Displacement Response 50
4.1.4 Curvature Distribution 53
4.1.5 Hoop Strains in Potential Crack Patterns 54
4.2 Comprehensive Comparison 56
4.2.1 Initial Stiffness, Ductility and Normalized Hysteresis Loop 56
4.2.2 Energy Dissipation and Equivalent Viscous Damping Ratio 57
4.3 Analytical Results 58
4.3.1 Shear Strength Envelope and P-delta Effect 59
4.3.2 Comparison of Revised Shear Strength Prediction and Test Results 59
4.3.3 Shear Strength Contribution of Each Component: Vc ,Vp ,Vf and Vsct 62
Chapter 5 Conclusions 67
5.1 General 67
5.2 Conclusions 67
5.3 Future Works 69
References 70

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