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Presentation
Accounting for steel relaxation in prestressed concrete by finite element packages
21st Australasian Conference on the Mechanics of Structures and Materials, ACMSM21: Incorporating sustainable practice in mechanics of structures and materials
  • H L Yip, University of Hong Kong
  • Francis TK Au, University of Hong Kong
  • Scott T Smith, University of Hong Kong
Document Type
Conference publication
Publication Date
1-1-2010
Abstract

The stresses and strains in a prestressed concrete structure are subject to changes over a long period of time, during which creep and shrinkage of concrete and relaxation of the steel prestressing tendons develop gradually. If these time-dependent deformations are not considered properly during design with suitable measures taken during construction, cracking or other problems may occur afterwards. Although some commercial finite element packages can model creep and shrinkage of concrete, seldom can they model steel relaxation accurately. This paper presents a practical method to model steel relaxation in commercially available packages that are mostly competent at modelling complicated geometry. The accuracy and reliability of the methods are examined by comparing the results with available solutions. Good agreement with numerical solutions obtained from the same assumptions is observed. Reasonable agreement with available experimental results is observed and possible reasons leading to the discrepancies observed are discussed.

Citation Information

Yip, HL, Au, FTK & Smith, ST 2010, 'Accounting for steel relaxation in prestressed concrete by finite element packages', 21st Australasian Conference on the Mechanics of Structures and Materials, ACMSM21: Incorporating sustainable practice in mechanics of structures and materials, Melbourne, Vic., 7-10 December, ACMSM, pp. 155-160. ISBN: 9780415616577