Monitoring and methods of ensuring the safety of long-span post-tensioned slabs
Authors:
- Rafał Szydłowski,
- Barbara Łabuzek
Abstract
Post-tensioned concrete slabs have been used in building construction since several decades in many countries. Due to the presence of active reinforcement, this kind of concrete slabs can be constructed with larger span and higher slenderness than one with ordinary reinforcement. Most commonly,unbonded tendons are used to prestress the slabs. In this prestressing system the steel is separated from concrete by the plastics casings and grease. As a result of lack of friction, the steel has the possibility of sliding in the structure. Thus, the force from the steel tendon is transmitted on the concrete element by anchorage only. Accidental cut of the tendon or damage of anchorage causes tendon slip on the duct and its total elimination from work. For this reason, the need to ensure safety has led to withdrawing this type of prestressing from use in some countries. However, it is still commonly used in many countries as a cheap and useful construction solution. The authors of this work have designed several slabs with the span and slenderness significantly higher than those recommended as maximum values. Due to the unique sizes of these slabs and controversial type of prestressing used, the contractual security levels have been defined and a monitoring system has been developed. This paper presents the adopted assumptions, critical thresholds to appropriate security levels as well as the results of several-year monitoring showing that the relevant safety levels have been met.
- Record ID
- CUTc9c27812cc7d4940999488e1e6cb25ad
- Publication categories
- ; ;
- Author
- Pages
- 1452-1460
- Other elements of collation
- fot.; rys.; tab.; wykr.; Bibliografia (na s.) - 1460; Bibliografia (liczba pozycji) - [6]; Oznaczenie streszczenia - Abstr.
- Substantive notes
- Nazwa wydawcy wg cop.
- Book
- Derkowski W., W. Derkowski Gwoździewicz P., P. Gwoździewicz Hojdys Ł. Ł. Hojdys [et al.] (eds.): Concrete – innovations in materials, design and structures : proceedings of the fib Symposium 2019 held in Kraków, Poland 27-29 May 2019, fib Symposium Proceedings, 2019, [Kraków], International Federation for Structural Concrete, 2319 p., ISBN 978-2-940643-00-4
- Keywords in English
- post-tensioned slab, unbonded tendons, monitoring
- URL
- https://www.fib-international.org/publications/fib-proceedings/fib-symposium-in-krakow,-poland-2019-proceedings-detail.html Opening in a new tab
- Language
- eng (en) English
- Score (nominal)
- 5
- Additional fields
- Indeksowana w: Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUTc9c27812cc7d4940999488e1e6cb25ad/
- URN
urn:pkr-prod:CUTc9c27812cc7d4940999488e1e6cb25ad
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.