Strengthening of Concrete Structures with Adhesively Bonded Reinforcement: Design and Dimensioning of CFRP Laminates and Steel Plates

Strengthening of Concrete Structures with Adhesively Bonded Reinforcement: Design and Dimensioning of CFRP Laminates and Steel Plates

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Overview

Design and construction in existing contexts is becoming increasingly important, and often the structures - sometimes of historical interest - can be preserved easily and at minimum cost by employing strengthening measures. Existing concrete members can be strengthened by using adhesives to bond additional reinforcing elements onto or into those members. This book explains the design rules, together with their background, and uses examples to illustrate their use, specifically for slabs, beams and columns. Concrete member strengthening measures can take the form of, for example, flexural strengthening with externally bonded (surface-mounted) CFRP strips, CF sheets and steel plates, flexural strengthening with CFRP strips bonded in slits (near-surface-mounted reinforcement), shear strengthening with externally bonded CF sheets and steel plates, and column strengthening with CF sheets as confining reinforcement.
The explanations and background information provided are mainly based on the new German guideline "Strengthening of Concrete Members with Adhesively Bonded Reinforcement" by the German Committee for Structural Concrete (DAfStb). This is the first European guideline to regulate this topic in the form of a supplement to the Eurocode. As it is planned to produce a document in a future Eurocode 2, the DAfStb guideline serves as a starting point.
The authors are extensively involved in the planning, design, operation and inspection of buildings for preservation and reconstruction, and in the updating of European Technical Approval Guidelines (ETAGs) and design rules.

Selected chapters from the German concrete yearbook are now being published in the new English "Beton-Kalender Series" for the benefit of an international audience.
Since it was founded in 1906, the Ernst & Sohn "Beton-Kalender" has been supporting developments in reinforced and prestressed concrete. The aim was to publish a yearbook to reflect progress in "ferro-concrete" structures until - as the book's first editor, Fritz von Emperger (1862-1942), expressed it - the "tempestuous development" in this form of construction came to an end. However, the "Beton-Kalender" quickly became the chosen work of reference for civil and structural engineers, and apart from the years 1945-1950 has been published annually ever since.

Product Details

ISBN-13: 9783433030868
Publisher: Wiley
Publication date: 04/27/2015
Pages: 158
Product dimensions: 6.60(w) x 9.40(h) x 0.40(d)

About the Author

Prof. em. Dr.-Ing. habil. Dr.-Ing. E. h. Konrad Zilch studied civil engineering and gained his doctorate at TU Darmstadt in 1976. Following research posts at the University of California, Berkley, and the University of Western Ontario, Canada, he worked in the construction industry for many years. From 1988 to 1993 he was professor for structural analysis at RWTH Aachen University, and from 1993 to 2009 professor for concrete structures at TU Munich.
PD Dr.-Ing. habil. Roland Niedermeier studied civil engineering and gained his doctorate at TU Munich in 2001. Since 1993 he has been involved in research at TU Munich and MPA BAU, the accredited authority for testing construction materials and products, where he has been the head of the Structural Engineering Laboratory since 2001.
Dr.-Ing. Wolfgang Finckh studied civil engineering and gained his doctorate at TU Munich in 2012. He has been a chief design engineer at Wayss & Freytag Ingenieurbau AG (w&f) since 2012.

Table of Contents

Editorial ix

1 Introduction 1

1.1 The reason behind this book 1

1.2 Strengthening with adhesively bonded reinforcement 1

2 DAfStb guideline 3

2.1 The reasons for drawing up a guideline 3

2.2 Preparatory work 3

2.3 Work on the guideline 4

2.4 The structure and content of the guideline 4

2.4.1 General 4

2.4.2 Design and detailing 4

2.4.3 Products and systems 4

2.4.4 Execution 5

2.4.5 Planning 5

2.5 Safety concept 5

2.6 Applications 6

2.6.1 Member to be strengthened 6

2.6.2 Strengthening systems 7

2.6.3 Ambient conditions 7

2.6.4 Fire protection 8

2.7 Relationship with other regulations 9

2.8 Documents and assistance for practical applications 10

3 Design of strengthening measures with externally bonded CFRP strips 11

3.1 Principles 11

3.2 Verification of flexural strength 13

3.3 Bond analysis 15

3.3.1 Principles 15

3.3.2 Simplified method 16

3.3.3 More accurate method 17

3.3.3.1 General 17

3.3.3.2 Determining the crack spacing 19

3.3.3.3 Accurate analysis of concrete element between cracks 20

3.3.3.4 Simplified analysis of element between cracks 23

3.3.4 End anchorage analysis 24

3.3.4.1 General 24

3.3.4.2 End anchorage analysis at flexural crack nearest to point of contraflexure 24

3.3.4.3 Anchorage analysis at an arbitrary concrete element between cracks 26

3.3.4.4 End anchorage analysis with shear wrapping 27

3.4 Shear force analyses 29

3.4.1 Shear strength 29

3.4.2 Shear strengthening 30

3.4.2.1 Full wrapping in steel 31

3.4.2.2 Full wrapping in fibre-reinforced material 32

3.4.2.3 U-wrapping 32

3.4.3 End strap to prevent concrete cover separation failure 33

3.5 Fatigue analysis 35

3.6 Analyses for the serviceability limit state 36

3.7 Detailing 36

3.7.1 Strip spacing 36

3.7.2 Provision of shear straps 37

3.7.3 Steel shear straps 37

4 Example 1: Strengthening a slab with externally bonded CFRP strips 39

44 System 39

4.1.1 General 39

4.1.2 Loading 39

4.1.3 Construction materials 40

4.1.3.1 Near-surface tensile strength 40

4.1.3.2 Concrete compressive strength 41

4.1.3.3 Type and quantity of existing reinforcement 41

4.1.3.4 Position of existing reinforcement 41

4.1.3.5 Strengthening system 41

4.2 Internal forces 42

4.3 Determining the prestrain 42

4.4 Simplified analysis 44

4.5 Accurate analysis 46

4.5.1 General 46

4.5.2 Verification of flexural strength 46

4.5.3 Determining the crack spacing 48

4.5.4 Accurate analysis of concrete element between cracks 48

4.5.4.1 Determining the strip forces 49

4.5.4.2 Determining the bond strength 52

4.5.5 End anchorage analysis 55

4.6 Analysis of shear capacity 58

4.7 Serviceability limit state 59

5 Design of strengthening with near-surface-mounted CFRP strips 61

5.1 Principles 61

5.2 Verification of flexural strength 61

5.3 Bond analysis 63

54 Shear Force Analyses 65

5.5 Fatigue analysis 66

5.6 Analyses for the serviceability limit state 67

5.7 Detailing 67

6 Example 2: Strengthening a beam with near-surface-mounted CFRP strips 69

6 J System 69

6.1.1 General 69

6.1.2 Loading 69

6.1.3 Construction materials 71

6.1.3.1 Concrete compressive strength 71

6.1.3.2 Type and quantity of existing reinforcement 71

6.1.3.3 Position of existing reinforcement 71

6.1.3.4 Strengthening system 71

6.2 Internal forces 72

6.3 Determining the prestrain 72

6.4 Verification of flexural strength 74

6.5 Bond analysis 76

6.5.1 Analysis point 76

6.5.2 Acting strip force 78

6.5.3 Bond resistance 79

6.5.4 Bond analysis 80

6.6 Shear analyses 80

6.6.1 Shear capacity 80

6.6.2 Shear strengthening 81

6.6.3 Check for concrete cover separation failure 82

6.7 Analyses for the serviceability limit state 84

7 Design of column strengthening with CF sheets 87

7.1 Principles 87

7.2 Properties of CF sheets relevant to design 91

7.3 Load-carrying capacity of cross-section 93

7.4 Load-carrying capacity of member 98

7.5 Creep 102

7.6 Analysis at ultimate limit state 105

7.7 Analysis at serviceability limit state 111

8 Example 3: Column strengthening 115

8.1 System 115

8.1.1 General 115

8.1.2 Loading 115

8.1.3 Construction materials 116

8.1.3.1 Concrete 116

8.1.3.2 Type and quantity of existing reinforcement 116

8.1.3.3 Strengthening system 117

8.2 Internal forces 118

8.3 Determining the cross-sectional values 118

8.4 Boundary conditions 119

8.5 Verification of column load-carrying capacity 120

8.5.1 Creep of confined concrete 120

8.5.2 Properties of the CF sheet 121

8.5.3 Distribution of transverse compression 122

8.5.4 Multi-axial stress state in concrete 122

8.5.5 Calculation of column load-carrying capacity 123

8.6 Serviceability limit state 127

9 Summary and outlook 129

References 131

Index 145

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