Contents

Advantages and disadvantages of FRP composite ... 2.6. Applications of FRP strengthening. 36. 2.7 ... Fatigue of long span plated 2.3m beams using FRP plates.
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Contents

v

Contents

Preface List of contributors 1

Role of bonded fibre-reinforced composites in strengthening of structures

ix xiii 1

J J DARBY

1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 2

Introduction What is ‘strengthening with bonded 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

1

8 10

Review of materials and techniques for plate bonding

11

1 2 3 4 8

L C HOLLAWAY AND M B LEEMING

2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8

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

11 11 17 21 34 36 38 39

3

Materials

46

A R HUTCHINSON AND J QUINN

v

vi

Contents

3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9

Adhesive bonded connections Composite materials Adhesive materials Adhesion and surface preparation The bonding operation Durability and fire Painting Summary References

46 47 57 68 75 80 80 80 81

4

Structural strengthening of concrete beams using unstressed composite plates

83

L C HOLLAWAY AND G C MAYS

4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 5

Introduction Part A Laboratory tests General form and behaviour of loaded beams Geometric parameters Discussion Part B Field investigation Testing programme for 18m beam Observations Concluding remarks References

83 84 84 91 107 109 109 131 132 132

Structural strengthening of concrete beams using prestressed plates

135

H N GARDEN AND G C MAYS

5.1 5.2

135

5.6 5.7 5.8

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 of concrete beams strengthened with prestressed plates in the ROBUST programme Observations Concluding remarks References

6

Environmental durability

156

5.3 5.4

5.5

A R HUTCHINSON AND L C HOLLAWAY

137 138

140

146 149 154 154

Contents

vii 156 157 158 160

6.8 6.9 6.10

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

7

Time-dependent behaviour and fatigue

183

6.1 6.2 6.3 6.4 6.5 6.6 6.7

163 166 173 179 181 181

R A BARNES AND H N GARDEN

7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 7.10 7.11 7.12 7.13 7.14 7.15 7.16 7.17 7.18 8

Introduction PART A Time-dependent behaviour 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 behaviour 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 2.3 m beams using FRP plates Concluding summary References Analytical and numerical solutions to structural strengthening of beams by plate bonding P S LUKE

183 183 183 184 184 184 192 194 196 197 200 200 201 203 206 208 211 213 217 218 222

viii

Contents

8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 8.9 8.10

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

222 223 223 231 231 234 237 240 241 241

9

Design and specifications for FRP plate bonding of beams

242

M B LEEMING AND J J DARBY

9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 9.9 10

Introduction Practical design rules and guidelines Application of the technique Materials Workmanship Quality control In-service inspection and maintenance References Bibliography

242 242 257 258 260 261 266 267 268

Site construction techniques

270

A P RIMOLDI

10.1 10.2 10.3 10.4 10.5 10.6 11

Introduction Steel plate bonding Adhesive bonding of carbon fibre composite plates – site requirements Economics Conclusion References

270 270

Case studies of carbon fibre bonding worldwide

288

272 286 287 287

M A SHAW AND J F DREWETT

11.1 11.2 11.3 11.4

Introduction System properties Case histories References

288 289 290 324

Index

325