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

ISBN: 978-3-433-03086-8
158 pages
April 2015
Strengthening of Concrete Structures with Adhesive Bonded Reinforcement: Design and Dimensioning of CFRP Laminates and Steel Plates (3433030863) cover image


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.
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Table of Contents

1 Introduction
2 DAfStb guideline
2.1 The reasons for drawing up a guideline
2.2 Preparatory work
2.3 Work on the guideline
2.4 The structure and content of the guideline
2.5 Safety concept
2.6 Applications (Member to be strengthened, Strengthening systems, Ambient conditions, Fire protection)
2.7 Relationship with other regulations
2.8 Documents and assistance for practical applications
3 Design of strengthening measures with externally bonded CFRP strips
3.1 Principles
3.2 Verification of flexural strength
3.3 Bond analysis (Simplified method, More accurate method, Determining the crack spacing, Simplified analysis of element between cracks, End anchorage analysis)
3.4 Shear force analyses
3.5 Fatigue analysis
3.6 Analyses for the serviceability limit state
3.7 Detailing
4 Example 1: Strengthening a slab with externally bonded CFRP strips
5 Design of strengthening with near-surface-mounted CFRP strips
5.1 Principles
5.2 Verification of flexural strength
5.3 Bond analysis
5.4 Shear force analyses
5.5 Fatigue analysis
5.6 Analyses for the serviceability limit state
5.7 Detailing
6 Example 2: Strengthening a beam with near-surface-mounted CFRP strips
7 Design of column strengthening with CF sheets
7.1 Principles
7.2 Properties of CF sheets relevant to design
7.3 Load-carrying capacity of cross-section
7.4 Load-carrying capacity of member
7.5 Creep
7.6 Analysis at ultimate limit state
7.7 Analysis at serviceability limit state
8 Example 3: Column strengthening
9 Summary and outlook
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Author Information

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.
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