TG5.1 - FRP Reinforcement for concrete structures

The main objectives of TG5.1 are:

• The elaboration of design guidelines in accordance with the design format of the fib Model Code for Concrete Structures 2010 (“fib MC2010”) and Eurocode 2.
• Link with other initiatives regarding material testing and characterisation & development of standard test methods.
• Participation in the international forum in the field of advanced composite reinforcement, stimulating the use of FRP for concrete structures.
• Guidance on practical execution of concrete structures reinforced/prestressed/strengthened by FRP.

Convener
Stijn Matthys

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TG5.2 - Reinforcing steels and systems

fib Task Group 5.2 (TG5.2) will consider all aspects related to reinforcing steels and systems from design to manufacturing, testing and final installation, use and maintenance. It will initially address several topics considered high priority. TG5.2 will create sub-groups to work on particular subjects.

Areas of interest:

• review of the reinforcing steel grades available on the market (strength, ductility, bond, fatigue, durability properties) and relevant concrete structure design codes;
• manual for reinforcing materials and systems;
• technical report on fabrication of reinforcement;
• state of the knowledge on the bond properties of reinforcing steels;
• state of the knowledge on the fatigue resistance properties of reinforcing steels.

Convener
Ladin Camci

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TG5.3 - Prestressing materials and systems

Since Eugène Freyssinet’s first of use high-strength steel wire for prestressing concrete in the late 1920s, there have been many changes in prestressing systems used around the world. Current systems bear little resemblance to many of the older methods used in the past. Designers and contractors need information regarding these historical practices and materials to evaluate existing prestressed concrete in need of repair and to determine effective strategies to extend service life and enhance performance. Further, as new technologies are developed, they are often used in some countries but not in others.

Task Group 5.3 (TG5.3) has established two goals: 1) to develop a state-of-the-art report describing the evolution and development of prestressing systems and to identify recent innovations and advances, and 2) to develop a new bulletin that provides recommendations for the installation of post-tensioning systems.

Convener
Tommaso Ciccone

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TG5.4 - Recommendations for ground anchor systems

The overall motivation of Task Group 5.4 (TG5.4) is to establish a modern recommendation for the qualification of ground anchor systems.

The main objective of TG5.4 is to prepare a bulletin entitled “Recommendation for ground anchor systems” based on and updating earlier documents such as the “Recommendations for the design and construction of ground anchors”, 1996. The recommendations will include significant content for qualification of ground anchor systems covering prestressed permanent and temporary anchors.

Convener
Matthias Ryser

Co-Convener
Xiaomeng Wang

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TG5.5 - Cables for cable-supported bridges

fib Bulletin 89, Acceptance of cable systems using prestressing steels, as an update of the previous fib Bulletin 30 was published in 2019.

The goal of Task Group 5.5 (TG5.5) is to work on selected individual topics related to cable systems for a further future update of Bulletin 89. The topics will be addressed one after the other and published in a few individual technical reports before they will be included in a full revision of Bulletin 89.

Workflow and Timeline:

• Fire protection and fire testing of cables: 2020 - 2023
• Damper/damping requirements: 2022 - 2024
• Icing / ice mitigation of cables: 2024 - 2025
• Update on inspection technologies of cables
• SHMS for cable stayed bridges with post-data processing
• Illumination of stay cables
• Terrorism protection of cables

A new technical report on fire protection of stay cables is expected to be published in 2023.

Convener
Werner Brand

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TG5.10 - Inspection and monitoring of reinforced/prestressed concrete structures

Maintenance of aging infrastructure (buildings, bridges, tunnels, etc.) is a significant part of both public, and private-entities’ budgets. The worldwide infrastructure and property maintenance costs are estimated to be EUR 180 billion per year. These costs depend on industry sector, age of the assets and governmental regulations. They highly affect the financial situation of public bodies and the profitability of enterprises.

There is a need to develop a guideline document to cover state-of-the-art inspection method statements, available sensor technologies including emerging digital solutions and remote sensing (e.g. drone inspection).

The required time for the development of this guideline is estimated between two to three years. The rough and high-level schedule is suggested as follows:

• First 6 to 9 months focused on building up the team and finalize the definition of the scope and content. Both are interlinked;
• Next 12 to 18 months working on developing the content of the different chapters;
• Final 6 to 9 months to finalize the first draft, including editorial review, before its submission to the TG 5.10 and C5;
• Finally, some time is expected to engage the peer reviewers and answer questions/comments received from the TG 5.10 and C5.

Convener
Antonio Caballero

Convener
Jan Winkler

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TG5.11 - Polymer-duct systems for internal bonded post-tensioning

Re-activate the earlier Task Group for polymer duct systems.

It should be the objective to limit changes to a minimum only where needed. It is also suggested to limit the number of drafting members to a relatively small group to facilitate web-meetings, and subsequently circulate draft changes to a wider group. Since fib Bulletin 75 is referenced in approval procedures in Europe and Florida DOT, it is imperative to have representatives of approval bodies and FDOT actively involved into the review.

Convener
Adrian Knägi

Co-Convener
Hans Rudolf Ganz

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TG5.12 - Ultra-high strength prestressing steels for post-tensioning kits and stay systems

The goal of sustainability involves a consensus among economic, environmental and social factors. Due to climate change, environmental concerns have increased in society. The construction sector is among the most active high environmental impact sectors. Emissions from building and infrastructure construction are expected to form the single largest category of consumption-based emissions for C40 cities between 2017 and 2050, producing 21% of consumption emissions. As this period is critical for reducing greenhouse gas (GHG) emissions in line with keeping global temperature rise to within 1.5ºC above pre-industrial averages, serious action is needed in this area.

Ultra-High Strength Prestressing (UHSP) strands, namely strands with tensile strength of 2060 to 2360 MPa, has the potential to greatly reduce the quantity of steel necessary in concrete structures.

The goal of new proposed Task Group is the development of a guideline where the key aspects of introducing ultra-high strength strands at different prestressing applications (along with post-tensioning and stay cable systems) i.e. crucial material properties and risk of hydrogen induced stress corrosion failure, design recommendation, system and material testing, quality control, etc. are covered.

Convener
Behzad Manshadi

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TG5.13 - Grouting of tendons in prestressed concrete

Prestressed Concrete is a very efficient form of construction; it takes advantage of the strength of concrete in compression. Developed mainly over the second part of the 20th century, it has proven to be reliable and durable. However, in the 1990's some cause for concern was discovered, first in the UK and followed by many other countries of the world. It appeared that the grout, an important means of protection of the steel against corrosion for internally ducted tendons, was in some cases inadequate.

The goal of new proposed Task Group is the development of a Guide to good practice. As the first proposal, the document will cover the same topics as the original bulletin 20.

Convener
Guillermo Ramírez

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