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Temperature gradients in concrete box girder bridge under effect of cold wave
引用本文:顾斌,陈志坚,陈欣迪. Temperature gradients in concrete box girder bridge under effect of cold wave[J]. 中南工业大学学报(英文版), 2014, 0(3): 1227-1241
作者姓名:顾斌  陈志坚  陈欣迪
基金项目:Project(08Y60) supported by the Traffic Science's Research Planning of Jiangsu Province, China
摘    要: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.

关 键 词:预应力混凝土箱梁桥  温度梯度  寒潮过程  温度预测模型  梯度模型  敏感性分析  温度分布  辐射冷却

Temperature gradients in concrete box girder bridge under effect of cold wave
GU Bin,CHEN Zhi-jian,CHEN Xin-di. Temperature gradients in concrete box girder bridge under effect of cold wave[J]. Journal of Central South University of Technology, 2014, 0(3): 1227-1241
Authors:GU Bin  CHEN Zhi-jian  CHEN Xin-di
Affiliation:[1]College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China [2]School of Earth Sciences and Engineering, Hohai University, Nanjing 210098, China [3]College of Harbour, Costal and Offshore Engineering, Hohai University, Nanjing 210098, China
Abstract:concrete box girder temperature field temperature gradient cold wave
Keywords:concrete box girder  temperature field  temperature gradient  cold wave
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