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

Co-Convener
Matthias Ryser

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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
Hermann Weiher

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TG5.5 - Cables for cable-supported bridges

fib Bulletin 30, "Acceptance of stay cable systems using prestressing steels", was published in 2005. Since then, extradosed bridges, a bridge typology that is placed between cable-stayed bridges and ordinary girder bridges, became more and more popular. While extradosed bridges were already known at the time of publication of Bulletin 30, the knowledge was not enough to include this typology into the document.

Additionally, after more than seven years, there is a general request from system suppliers, designers and authorities to update the current document so new stay cable system/solutions, applications, acquired knowledge, installation methods, etc. are discussed and included in a new document version.

The goal of Task Group 5.5 (TG5.5) is to update the current recommendation document so extradosed bridges are fully included (e.g. loading over SLS design, loading over ULS design, design & detailing, construction, initial type testing, etc.).

Convener
Werner Brand

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TG5.8 - External tendons for bridges

As a result of durability issues with bonded internal tendons, external tendons in bridge construction have become more popular in several countries. External tendons are now widely used throughout the world. While many of the technological aspects of external tendons look similar to internal bonded tendons, there are significant differences between the two, e.g. in terms of corrosion protection, tendon deviation blocks, tendon curvature and lay out, tendon replaceability, tendon force transfer to the structure, and ultimate strength. These differences merit the amendment of existing specifications, or the preparation of new specifications for external tendon design, testing, installation, duct durability, corrosion protection, maintenance and eventual replacement.

The goal of Task Group 5.8 (TG5.8) is to prepare a technical report on the applications of external tendons in bridges from different countries and focusing on system related topics with minor implementation of design aspects of the structure using external tendons.

Convener
Christian Gläser

Convener
Teddy S. Theryo

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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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