Strengthening of Reinforced Concrete Structures: Using Externally-Bonded FRP Composites in Structural and Civil Engineering

The in situ rehabilitation or upgrading of reinforced concrete members using bonded steel plates is an effective, convenient, and economic method of improving structural performance. However, disadvantages inherent in the use of steel have stimulated research into using fiber reinforced polymer (FRP) material in its place, with the goal of providing a non-corrosive, more versatile strengthening system. Strengthening of Reinforced Concrete Structures presents a detailed study of the flexural strengthening of reinforced and prestressed concrete members using FRP composite plates. This book covers short and long term performance through model and full-scale experimental testing plus theoretical and numerical considerations. It discusses previous investigative and site work undertaken to strengthen concrete beams using steel bonded pates and the pros and cons of using the steel and composite plate materials. It also presents case histories of construction members upgraded or strengthened using carbon fibre/polymer matrix composite materials bonded to the structural unit. A consortium of academic and industrial researchers provided much of the data and contributed the chapters to this volume. The research and trial tests were undertaken as part of the United Kingdom's ROBUST project. Strengthening of Reinforced Concrete Structures serves to disseminate the large amount of information that resulted from these studies. As detailed in this book, their results will serve to help generate and formulate design specifications as engineers continue to apply these important techniques to an ever-widening range of applications.

Role of Bonded Fiber-Reinforced Composites in Strengthening of Structures, J.J. Darby
Introduction
What is "Strengthening with Bounded Fibre Reinforced Polymer Composite Plates"?
The Market for Strengthening
Strengthening Techniques
Advantages and Disadvantages of FRP Composite Plate Bonding
Client Concerns when Introducing New Techniques
Risk to Clients when Adopting FRP Composite Plate Bonding
Conclusions
Review of Materials and Techniques for Plate Bonding, L.C. Holloway and M.B. Leeming
Introduction
Structural Adhesive Bonding
External Strengthening Using Steel Plates
External Strengthening Using Composite Materials
Strengthening of Reinforced Concrete Members in Shear
Applications of FRP Strengthening
Summary and Conclusions of Literature Review
References
Materials, A.R. Hutchinson and J. Quinn
Adhesive Bonded Connections
Composite Materials
Adhesive Materials
Adhesion and Surface Preparation
The Bonding Operation
Durability and Fire
Painting
Summary
References
Structural Strengthening of Concrete Beams Using Unstressed Composite Plates, L.C. Hollaway and G.C. Mays
Introduction
General Form and Behavior of Loaded Beams
Geometric Parameters
Discussion
Testing Programme for 18m Beam
Observations
Concluding Remarks
References
Structural Strengthening of Concrete Beams Using Prestressed Plates, H.N. Garden and G.C. Mays
Introduction
Review of Previous Prestressing Studies Using Composite Plates
Prestressing Technique Employed in the Laboratory
Results of Laboratory Tests for Concrete Beams Strengthened with Prestressed Plates in the ROBUST Programme
Results of Field Investigations for Concrete Beams Strengthened with Prestressed Plates in the ROBUST Programme
Observations
Concluding Remarks
References
Environmental Durability, A.R. Hutchinson and L.C. Hollaway
Introduction
Environmental and Service Conditions
Factors Affecting Joint Durability
Environmental Durability of Adhesive Bonded Joints
Procedures for Assessing Environmental Effects on materials and on Bonded Joints
Effect of Environment on the Component Materials Used in the ROBUST System
Influence of Surface Treatment and Effects of Environment on Joints and Interfaces
Other Factors Affecting Service Performance
Summary
References
Time-Dependent Behavior and Fatigue, R.A. Barnes and H.N. Garden
Introduction
PART A: Time Dependent Behavior
Introduction
Time-Dependent Characteristics of Concrete
Time-Dependent Characteristics of Steel
Time-Dependent Characteristics of Adhesives
Time-Dependent Characteristics of Plated Beams Using Steel Plates
Time-Dependent Characteristics of FRP Component Materials and FRP Composites
Time-Dependent Characteristics of Plated Beams Using Polymer Composite Plates
Creep Tests Conducted During the ROBUST Project
PART B: Fatigue Behavior
Introduction
Fatigue of Unplated Beams
Fatigue of Adhesives
Fatigue of FRP Materials
Fatigue of Plated Beams Using Steel Plates
Fatigue of Short Span Plated Beams Using FRP Plates
Fatigue of Long Span Plated 2.3m Beams Using FRP Plates
Concluding Summary
References
Analytical and Numerical Solutions to Structural Strengthening of Beams by Plate Bonding. P.S. Luke
Introduction
Classical Analysis
Finite Element Analysis
Effect of Adhesive Material
Prestressed 18.0m Concrete Beams
Beams with Unstressed Plates
Beams with Stressed Plates
Concluding Remarks
References
Bibliography
Design and Specifications for FRP Plate Bonding of Beams, M.B. Leeming and J.J. Darby
Introduction
Practical Design Rules and Guidelines
Application of the Technique
Materials
Workmanship
Quality Control
In-Service Inspection and Maintenance
References
Bibliography
Site Construction Techniques, A.P. Rimoldi
Introduction
Steel Plate Bonding
Adhesive Bonding of Carbon Fibre Composite Plates-Site Requirements
Economics
Conclusion
References
Case Studies of Carbon Fiber Bonding Worldwide, M.A. Shaw and J.P. Drewett
Introduction
System Properties
Case Histories
References
Index