CALCULATING TIME-DEPENDENT EFFECTS IN COMPOSITE GIRDERS

HET BEREKENEN VAN TIJDSAFHANKELIJKE EFFECTEN IN SAMENGESTELDE LIGGERS

A numerical solution method based on the interval method has been developed for calculating time dependent effects in composite, pre-stressed girder structures. A characteristic of this method is that the use of differential equations is avoided and that several random shrink and creep functions and other time dependent relationships can be used effectively. This method is explained in the article, and a computer program, named COMPO, suitable for calculations for pre-fabricated concrete girders with a compression layer cast in situ is described. A representative sample calculation for a bridge girder shows that the strength of the compression layer cast in situ has a relevant effect on the development of the stress lines in the girder and on the eventual deformation behaviour. In practice, deformation behaviour at variance with the predictions is often found in the phase during and shortly after the manufacture of prefab girders, in the sense that the bending is usually greater than expected. The calculation model described here already allows for this (operationally) by introducing an extra plastic-flow factor in accordance with the CEB-FIP Model Code 1978. Further research into this, both theoretical and practical, is desirable. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00088811
• Corporate Authors:

  Vereniging Nederlandse Cementindustrie

  Sint Teunislaan 1, Postbus 3011
  S-Hertogenbosch,   Netherlands 
• Authors:
  • Niemantsverdriet, J
  • DE WIT, JCWM
• Publication Date: 1989-1

Language

• Dutch

Media Info

• Features: References;
• Pagination: p. 42-46
• Serial:
  • Cement
  • Volume: 41
  • Issue Number: 1
  • Publisher: Vereniging Nederlandse Cementindustrie
  • ISSN: 0008-8811

Subject/Index Terms

• TRT Terms: Bridges; Composite materials; Computer programs; Deformation; Forecasting; Girders; Prestressing; Time dependence
• Old TRIS Terms: Composite girders
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00617480
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Nov 30 1991 12:00AM