Studies on Temperature Field Boundary Conditions for Concrete Box-girder Bridges Under Solar Radiation

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China Journal of Highway and Transport ›› 2016, Vol. 29 ›› Issue (7) : 52-61.

ZHAO Ren-da, WANG Yong-bao

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In order to choose appropriate formulas to calculate the temperature field boundary conditions for concrete box-girder bridges under solar radiation, the existing formulas and values of direct solar radiation, diffusion radiation, ground reflection, convection coefficient, radiation coefficient, and comprehensive atmospheric temperature were compared and analyzed synthetically. Based on the temperature field experimental results of Qigan Nen River Bridge and the finite element program of temperature field analysis, the influences of different formulas of solar direct radiation intensity, diffusion radiation intensity and ground reflection radiation intensity on the roof, web and floor of box-girder were investigated. The reasonable range of radiation heat transfer coefficient which was suitable for engineering application was discussed. The heat convection coefficient which was affected by temperature difference between bridges and environment and wind speed was investigated. In addition, the influence laws of ambient atmospheric temperature values of different parts of box-girder on temperature field inside box-girder were researched. The results show that the solar direct radiation intensity has a great influence on the temperature distribution on the roof of box-girder, and the temperature distributions on the roof and web of box-girder are greatly influenced by the diffusion radiation intensity. The suitably selected formulas of direct radiation and diffusion radiation intensity can improve the calculation accuracy of temperature field on concrete box-girder. The effects of slant sky radiation in ground reflection and radiation heat transfer on the temperature distributions on the roof and floor of box-girder respectively are great, which cannot be ignored in design and calculation. The temperature field on concrete box-girder structure can be calculated accurately by comprehensively considering the convection coefficient which is calculated by temperature difference and wind speed. The value of radiation heat transfer coefficient is little affected by the external condition, so a value in a certain range can be taken. The ambient atmospheric temperatures in different parts of box-girder should be considered when calculating the corresponding comprehensive atmospheric temperatures.

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bridge engineering / concrete box-girder / comparative analysis / solar radiation / boundary condition / temperature field

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ZHAO Ren-da, WANG Yong-bao. Studies on Temperature Field Boundary Conditions for Concrete Box-girder Bridges Under Solar Radiation[J]. China Journal of Highway and Transport, 2016, 29(7): 52-61

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Received	Published
2015-09-04	2016-07-20
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2016-08-15

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