TEMPERATURE DIFFERENCES IN CONCRETE BRIDGES DUE TO THE INFLUENCE OF WEATHER AND HEATING

TEMPERATURUNTERSCHIED INFOLGE WITTERUNGSEINFLUSS UND BEHEIZUNG VON MASSIVEN BRUECKEN

The aim of this work is to determine to what extent damage in prestressed concrete bridges can be attributed to thermal stresses and whether the stresses arising from deck heating are greater than those due to climatic influences. The temperature field was computed using the finite difference version of Fourier's differential equation for heatflow, and then the stress distribution was obtained on the basis of assuming that the stresses due to the non-stationary temperature field in the various directions are mutually independent and that the cross sections of the deformed structure remain plane. A total of 13 existing bridges (7 with box girder section and 6 of tee-beam section) were analysed with this method and the temperature field and stresses due to climatic causes in the summer and to deck heating in the winter respectively were computed. The results show that the stresses due to deck heating are well within the range of stresses due to climatic influences. For the examples cited the calculated values in the longitudinal direction of temperature differences are of the order delta theta = +5 deg C, the tensile stresses about sigma = 10 kp/cm 2 and compressive stresses can reach 20-30 kp/cm 2. For box girder sections the temperature differences in transverse direction obtained for the uncracked section are delta theta = 3 to 14 deg C depending on the radiation. /TRRL/

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  • Corporate Authors:

    Bundesminister fuer Verkehr

    Kennedy Allee Number 72
    5300 Bonn,   Germany 
  • Authors:
    • ZICHNER, T
  • Publication Date: 1976

Language

  • German

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Filing Info

  • Accession Number: 00195041
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: Aug 15 1979 12:00AM