Analysis and Design of Partially Prestressed Concrete Bridges Under Thermal Loading

摘要

>Theory is developed for the inelastic thermal analysis of partially prestressed concrete bridge superstructures, including the effects of cracking and nonlinearity of material properties. An experimental  investigation involving the thermal loading of T-beam and box-girder beam partially prestressed models of about one-sixth scale is described. Forces, deflections, and crack widths predicted by the  theoretical analysis are compared with experimental results. From the study several design recommendations are made. >References>1. Leonhardt, F., Kolbe, G., and Peter, J., "Temperature Differences Endanger Prestressed Concrete Bridges," Betonund Stahlbetonbau, No. 7, July 1965, pp. 157-163. >2. Leonhardt, F., and Lippoth, W., "Lessons From Damage to Prestressed Concrete B ridges," Beton-und Stahlbetonbau, No. 10, October 1970, pp. 231-244. >3. Priestley, M. J. N., "Thermal Gradients in Bridges-Some Design Considerations," New Zealand Engineering, V. 27, No. 7, July 1972, pp. 228-233- >4. Lanigan, A. G., "The Temperature Response of Concrete Box-Girder Bridges," PhD Thesis, University of Auckland, New Zealand, 1973. >5. Priestley, M. J. N., "Model Study of a Prestressed Concrete Box-Girder Bridge Under Thermal Loading," Proceedings, International Association of Bridge and Structural Engineering, 9th Congress, Amsterdam, 1972, pp. 737-746. >6. Priestley, M. J. N., and Wood, J. II., "Comparison Between Theory and In Situ Tests for a Complex Box-Girder Bridge," Proceedings, RILEM International Symposium on Testing In Situ of Concrete  tructures, V. 1, Budapest, 1977, pp. 140-153. >7. Priestley, M. J. N., "href="http://dx.doi.org/10.14359/10934 " title="Design of Concrete Bridges for Temperature Gradients" target="_blank">Design of Concrete Bridges for Temperature Gradients," ACI Journal, V. 75, No. 5, May 1978, pp. 209-216. >8. "Highway Bridge Design Brief," Ministry of Works and Development, New Zealand, October 1978. >9. Thurston, S. J., "Thermal Stresses in Concrete Structures," PhD Thesis and Research Report 78-21, University of Canterbury, New Zealand, 1978. >10. Beeby, A. W., Keyder, E., and Taylor, H. P. J., "Cracking and Deformation of Partially Prestressed Concrete Beams," Technical Report No. 42-465, Cement and Concrete Association, London, England, January 1972. >11. Gergely, P., and Lutz, L. A-, "Maximum Crack Widths in Reinforced Flexural Members," Paper No. 6, Causes, Mechanism, and Control of Cracking in Concrete, Special Publication SP-20,  American Concrete Institute, Detroit, Michigan, 1968. >12. Bennett, E. W., and Chandrasekhar, C. S., href="http://dx.doi.org/10.1680/iicep.1971.6231 " title=""Calculation of the Width of Cracks in Class 3 Beams,"" target="_blank">"Calculation of the Width of Cracks in Class 3 Beams," Proceedings, Institution of Civil Engineers,  V. 49, 1971, pp. 333-346. (See also Discussion of  Paper, V. 51, February 1972.) >13. Beeby, A. W., "An Investigation of Cracking in Slabs Spanning One Way," Technical Report No. 42-433, Cement and Concrete Association, London, England, April 1970. >14. Broms, B. D., href="http://dx.doi.org/10.14359/7740 " title=""Stress Distribution in Reinforced Concrete Members With Tension Cracks,"" target="_blank">"Stress Distribution in Reinforced Concrete Members With Tension Cracks," ACI Journal, Proceedings V. 62, No. 9, September 1965, pp. 1095-1108.