Impacts of sunshine on thermal distribution of box aqueduct in high altitude areas

The impacts of sunshine on thermal distribution of box-type aqueducts in high-altitude areas provide guidance for the design and construction of box-type aqueduct structures.The ANSYS is used in this study for a high-altitude box-type aqueduct,based on the heat conduction theory and the temperature boundary conditions of hydraulic aqueducts.The simulations of thermal distributions of the solar radiation show that the temperature of each wall is higher outside and lower inside with a quadratic distribution.The temperature stress of the wall is under expansion for the inner surface and under compression for the outer surface.The vertical maximum tensile stress appears on the inside of the top plate and the inside of the web.The maximum temperature compressive stress appears on the outside of the top plate and the web.The temperature stress on both inner and outer surfaces of each wall increases firstly and then decreases.Therefore,installation of temperature steel bars,lateral pre-stressing or surface heat insulation measures should be provided to improve the stress state of the aqueduct under the action of sunlight,and to make sure the safe operation of the structure,in the design and construction of the box aqueduct structure.

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