Abstract
Based on the engineering background as which a box-girder bridge under construction in typical winter weather of Qinghai-Tibet plateau is chosen, a diffusion equation of temperature of the structure has been established, whose choices of initial and boundary conditions are discussed according to the field monitoring data and local weather information including solar radiation and air convection. Secondly, some tests of numerical simulation have been done by FEM software, and related parameters of the model are obtained. Finally, based on the determinate parameters, the temperature fields of another box-girder bridge are simulated, which agree with the measured data in the field. All these show that the investigation is not only providing basic parameters for temperature loading in the control of construction process of the bridge, but also providing significant reference for the design and construction of the same kind of bridges in typical winter weather of Qinghai-Tibet plateau.
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