Abstract
The temperature distributions of a prestressed concrete box girder bridge under the effect of cold wave processes were analyzed. The distributions were found different from those under the effect of solar radiation or nighttime radiation cooling and should not be simplified as one dimensional. A temperature predicting model that can accurately predict temperatures over the cross section of the concrete box girder was developed. On the basis of the analytical model, a two-dimensional temperature gradient model was proposed and a parametric study that considered meteorological factors was performed. The results of sensitivity analysis show that the cold wave with shorter duration and more severe temperature drop may cause more unfavorable influences on the concrete box girder bridge. Finally, the unrestrained linear curvatures, self-equilibrating stresses and bending stresses when considering the frame action of the cross section, were derived from the proposed temperature gradient model and current code provisions, respectively. Then, a comparison was made between the value calculated against proposed model and several current specifications. The results show that the cold wave may cause more unfavorable effect on the concrete box girder bridge, especially on the large concrete box girder bridge. Therefore, it is necessary to consider the thermal effect caused by cold wave during the design stage.
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Foundation item: Project(08Y60) supported by the Traffic Science’s Research Planning of Jiangsu Province, China
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Gu, B., Chen, Zj. & Chen, Xd. Temperature gradients in concrete box girder bridge under effect of cold wave. J. Cent. South Univ. 21, 1227–1241 (2014). https://doi.org/10.1007/s11771-014-2057-6
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DOI: https://doi.org/10.1007/s11771-014-2057-6