Effects of Solar Temperature Gradient on Long-Span Concrete Box Girder during Cantilever Construction
Publication: Journal of Bridge Engineering
Volume 21, Issue 3
Abstract
Three-dimensional (3D) finite-element analysis of a 106 × 200 × 106-m concrete box girder was conducted to study the effect of solar temperature gradients on long-span bridges during construction. Segments over the internal piers and at midspan were investigated to obtain temperature distributions and thermal stresses during critical times of the day. On the basis of results of the thermal analysis, temperature gradients were developed for 0600 and 1500 hrs. to be used on the entire bridge. The maximum longitudinal tensile stress in the girder was 2.67 MPa, whereas lateral tensile stress could reach 4.41 MPa. Therefore, appropriate measures must be taken during construction to avoid cracking of the box girder. A 3D model of half the entire bridge was analyzed to obtain the effects of thermal loads on the bridge in its longest cantilever construction stage. The maximum vertical deflection at the cantilever end reached 46.0 mm at 1500 hrs., when the effect of temperature was highest. It was concluded that the deflection as a result of temperature gradients should be accounted for when determining the formwork elevations in the segmental cantilever construction process.
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References
ANSYS 12 [Computer software]. ANSYS, Canonsburg, PA.
Barr, P. J., Stanton, J. F., and Eberhard, M. O. (2005). “Effects of temperature variations on precast, prestressed concrete bridge girders.” J. Bridge Eng., 186–194.
Branco, F., and Mendes, P. (1993). “Thermal actions for concrete bridge design.” J. Struct. Eng., 2313–2331.
Chen, H. X., Liu, W. W., and Liu, F. Z. (2005). “Numerical calculation of steel-concrete composite beam specimen in its temperature dropping and rising process.” J. Central South Univ., 36(2), 335–339.
Elbadry, M. M., and Ghali, A. (1983). “Temperature variations in concrete bridge.” J. Struct. Eng., 2355–2374.
Elbadry, M., and Ghali, A. (1995). “Control of thermal cracking of concrete structures.” ACI Struct. J., 92(4), 435–450.
Fu, H. C., Ng, S. F., and Cheung, M. S. (1990). “Thermal behavior of composite bridges.” J. Struct. Eng., 3302–3323.
Guo, J. (2005). “Analysis of unsteady temperature gradient and thermal stress field for concrete girder of cable-stayed bridge.” China J. Highw. Transp., 18(2), 65–68.
Kehlbeck, F. (1981). Effect of solar radiation on bridge structure. Trans. F. X. Liu. China Railway Publishing House, Beijing.
Laosiriphong, K., GangaRao, H. V. S., Prachasaree, W., and Shekar, V. (2006). “Theoretical and experimental analysis of GFRP bridge deck under temperature gradient.” J. Bridge Eng., 507–512.
Li, S. S. (1996). Solar physics, Capital Normal University Press, Beijing.
Liu, D. S., Li, J. Z., and Feng, Z. R. (2007). “Spatial analysis of temperature gradient effect in process of cantilever construction of continuous box girder bridge.” World Bridges, 2007(3), 45–47.
MIDAS Civil [Computer software]. MIDAS Engineering Software, Gyeonggi-do, Korea.
Peng, Y. S. (2007). Studies on theory of solar radiation thermal effects on concrete bridges with application, Southwest Jiaotong Univ., Sichuan, China.
Roberts-Wollman, C., Breen, J., and Cawrse, J. (2002). “Measurements of thermal gradients and their effects on segmental concrete bridge.” J. Bridge Eng., 166–174.
Saetta, A., Scotta, R., and Vitaliani, R. (1995). “Stress analysis of concrete structures subjected to variable thermal loads.” J. Struct. Eng., 446–457.
Wang, Y., and Ye, J. S. (2009). “Analysis and control of temperature gradient’s influence on formwork erection elevation during balanced cantilever cast-in-place segmental construction of concrete girder.” J. Highw. Transp. Res. Dev., 26(8), 89–93.
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Information
Published In
Journal of Bridge Engineering
Volume 21 • Issue 3 • March 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Feb 17, 2015
Accepted: Aug 13, 2015
Published online: Jan 5, 2016
Published in print: Mar 1, 2016
Discussion open until: Jun 5, 2016
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