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FIB FIBBUL-0089-2018-E

Acceptance of stay cable systems using prestressing steels
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Cable-stayed structures have become increasingly popular over the last 30 years andhave been used in all parts of the world. Modern cable-stayed bridges have a history of over 50-years and have been constructed with span lengths ranging from 15 m to over 1000 m. Many long span cable-stayed bridges have been built for railway and highway traffic applications.

Stay cables have also been used on pedestrian structures, many ofwhich are architecturally striking and have become landmark structures. There is growing use in building structures, particularly for cable-supported roofs.Most of the cable supported structures have been in the form of cable-stayed bridges;but in recent years, extradosed bridges have seen increased popularity among the designers. Led by the experience in Japan, more than 200 extradosed bridges have been constructed worldwide in the past 15 years.The first edition of these fibrecommendations was published asfibBulletin 30 in 2005 and was the first specification published by fibfor stay cable systems.

This new bulletinhas been updated based on Bulletin 30 with the aim to reflect the current state of the art and encompass the latest knowledge in cable systems. In addition, it has been the aspiration of Commission 5 and Task Group 5.5 to harmonize the guidance in this updated bulletin with other stay cable recommendations from around the world, including those from Europe, Japan and the USA.This new bulletin is intended to supersede and replacefibBulletin 30. It is recommended that it be used in lieu offibBulletin 30 for all future cable supported applications.The updated bulletin introduces several significant enhancements to the specifications:These recommendations are applicable to both stay cable and extradosed cable applications.

In the past, there has been some debate over the boundary between cable-stayed and extradosed bridges. This bulletin presents a new continuous approach valid for both.A completely new testing requirement to assess the performance of cable systems under bending fatigue, including both anchorages and saddles, if applicable, hasbeen added.Testing requirements for saddle systems have been reformulated. In addition tothe bending fatigue test noted above, new testing procedures for stay cable saddles with isolated tensile elements are introduced.

This includes tests for saddle axial fatigue, friction and tensile testing, and determination of the effective saddle friction coefficient.Expanded system qualification, including requirements for both stay cable and extradosed applications. Includes new provisions for MTE qualification and additional load transferring connection devices. Minimum number of tests isspecified for each.A new in-situ damping measurement test has been added to verify the actualdamping ratio of the damping devices installed.

By testing on site, selected cables may be excited to vibrate without and with the damping devices so that the observedvibration behaviour can be compared to the specified value.Other revisions have been made to reflect the current state of practice:Expanded quality control testing requirementsInclusion of epoxy-coated prestressing steel as a protection layer. Previous recommendations only considered zinc coatings. Specifications for epoxy coating material are given.Requirements for stainless steel components such as pipes, caps and platesUpdated guidance for designing lightning protection systemsDetailed recommendations for different levels of inspection of cable systems, including: initial, routine, detailed and exceptional inspectionsAn updated list of references, relevant standards, and extended literatureI would like to express my sincere thanks to Dr.

Antonio Caballero and Professor Hiroshi Mutsuyoshi, co-convenors of Task Group TG5.5, and to Werner Brand, TG5.5 secretary, for their leadership in this effort. I would also like to acknowledge the contributions of all the members of Task Group 5.5 whose dedication and hard work made this importantstandard possible. I also express my appreciation to the several experts who have dedicated significant time to review and improve these recommendations, in particular Dr.

Hans-Rudolf Ganz and Mr. Gordon Clark.Theodore L. Neff - Chairman of Commission 5 "Reinforcements".

SDO FIB: The International Federation for Structural Concrete
Document Number FIBBUL-0089
Publication Date March 1, 2019
Language en - English
Page Count 126
Revision Level
Supercedes
Committee
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