Webbläsaren som du använder stöds inte av denna webbplats. Alla versioner av Internet Explorer stöds inte längre, av oss eller Microsoft (läs mer här: * https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Var god och använd en modern webbläsare för att ta del av denna webbplats, som t.ex. nyaste versioner av Edge, Chrome, Firefox eller Safari osv.

Reliability-based evaluation of the prestress level in concrete containments with unbonded tendons

In English

Författare

Summary, in English

It has been a common practice both in Sweden and worldwide to enclose nuclear reactors with prestressed concrete structures. The prestress level decreases with time from its initial value due to various degradation mechanisms. To ensure that the prestress level is sufficient the tendon force is measured at regular in-service inspections. The intention with this paper is to present a reliability-based procedure to evaluate the prestress level on the basis of data from in-service inspections. Existing approaches to evaluate the prestress level do not take into account the variability in the measured prestress. It is not possible to achieve a complete assurance concerning the prestress level. However, by using a probabilistic model, involving the variability in the measuring result and the structural behaviour, the prestress level could be confirmed in a more stringent way. Both the time dependent loss of prestress and the possibility of tendons being broken (due to defects as corrosion) are considered. To avoid through-wall cracks in the concrete it is required that the prestress shall counterbalances the tensile stresses expected at an internal accident. The factor of interest is the prestress level in the concrete and not the force in individual tendons. Several tendons influence the prestress level in a specific part of the containment. The required prestress level shall be fulfilled in all parts of the containment where each part is influenced by a number of individual tendons. It is suggested in this paper that this problem can be analysed as a structural reliability problem idealized as a series of correlated parallel subsystems. (C) 2006 Elsevier Ltd. All rights reserved.

Publiceringsår

2008

Språk

Engelska

Sidor

78-89

Publikation/Tidskrift/Serie

Structural Safety

Volym

30

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Building Technologies

Nyckelord

  • series system
  • parallel system
  • tendon
  • nuclear
  • loss of prestress
  • resistance deterioration

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0167-4730