RECOMMENDATIONS FOR UPGADING OF CONCRETE STRUCTURES

WITH USE OF CONTINUOUS FIBER SHEETS

CONTENTS

CHAPTER 1: GENERAL
1.1 Scope	1
1.2 Definitions	3
CHAPTER 2: BASICS OF UPGRADING.
2.1 General	4
2.2 Upgrading process	6
CHAPTER 3: MATERIALS
3.1 General	9
3.2 Quality of Materials	9
3.2.1 Continuous fiber sheets and continuous fiber strands	9
3.2.2 Impregnation resin	10
3.2.3 Primer	11
3.2.4 Smoothing agent	12
3.2.5 Other materials	12
3.3 Characteristic Values and Design Values of Materials	13
3.3.1 General	13
3.3.2 Continuous fiber sheets	14
3.3.3 Continuous fiber strands	17
CHAPTER 4: LOADS AND ENVIRONMENTAL ACTIONS	20
CHAPTER 5: DETAILED INSPECTION OF EXISTING CONCRETE STRUCTURES
5.1 General	21
5.2 Detailed inspection USING DOCUMENT, RECORDS, ETC	21
5.3 Detailed inspection at the site	22
CHAPTER 6: PERFORMANCE VERIFICATION FOR UPGRADED CONCRETE STRUCTURES
6.1 General	24
6.2 Design strength of materials in existing structures	25
6.2.1 General	25
6.2.2 Concrete	27
6.2.3 Steel	29
6.3 Safety factor	30
6.4 Verification of Safety	31
6.4.1 Design flexural and axial load-carrying capacity	31
6.4.2 Design shear capacity for bar members	35
6.4.3 Design flexural fatigue resistance	46
6.4.4 Design punching shear fatigue resistance of planar members	47
6.4.5 Safety with respect to seismic action	48
6.4.5.1 Design ductility ratio of members	48
6.4.5.2 Member restoration force model	51
6.4.6 Fire safety	52
6.4.7 Collision safety	55
6.5 Verification of serviceability	57
6.5.1 Stress level	57
6.5.2 Crack width	58
6.5.3 Displacement/deformation	59
6.6 Restorability	60
6.6.1 Restorability after earthquake	60
6.7 Changes of performance of upgraded structures with the elapse of time	61
6.7.1 General	61
6.7.2 Verification of the effect of using continuous fiber sheets to prevent intrusion of chloride ions	62
6.8 Verification of structural details	65
6.8.1 General	65
6.8.2 Corner angles of members	66
6.8.3 Overlap splices of continuous fiber sheets	66
6.8.4 Anchoring of continuous fiber strands	67
6.8.5 Mechanical anchoring of continuous fiber sheets	68
CHAPTER 7: UPGRADING WORK
7.1 General	69
7.2 Work plan	70
7.3 Handling of materials	71
7.4 Surface preparation	72
7.5 Bonding and jacketing	74
7.6 Finishing work	76
7.7 Inspections	78
7.7.1 General	78
7.7.2 Receiving inspection for materials	78
7.7.3 Inspection of material storage condition	79
7.7.4 Inspection of surface preparation, primer coating and smoothing	79
7.7.5 Inspection of continuous fiber sheets and continuous fiber strands during and after construction	80
CHAPTER 8: WORK RECORDS	82
CHAPTER 9: MAINTENANCE OF UPGRADED CONCRETE STRUCTURES
9.1 General	83
9.2 Inspections and evaluation	84
9.3 Countermeasures	86
References	87