The Research For Temperature Field And Thermal Stress Of The Reinforced Concrete Box Girder Bridge On The Effect Of Paving Asphalt

After the main structure of the bridge project is completed, the surface is intact beforeit was paved with Asphalt Concrete, however, after that, the main structure of some bridgehad cracks. The causes of these cracks are not yet been identified, it may be caused by thequality of the construction or the high temperature stress comes from asphalt concretepavement. This paper mainly aims to research and analysis temperature field of the boxgirder and thermal stress when pave asphalt concrete.Actual bridge test takes a lot of effort and time, this paper mainly uses the finiteelement model to make simulations and theoretical calculations on the box girder. Thispaper mainly includes two parts: analysis of the thermal conductivity and coupled thermalstress analysis.In the analysis process of heat conduction, the temperature field of the box girder wascalculated according the first boundary condition and the third type of boundary conditionrespectively. The boundary conditions were discussed in detail in the asphalt paving. InAsphalt paving, concrete box girder temperature field were analyzed in the factors (ambienttemperature, the temperature of the paving layer, the intensity of solar radiation, wind speed,etc.) The conclusion is that the finite element program for solving concrete box girdertemperature field is consistent with the requirements of practical engineering under thepremise of the conditions of the accurate definition of the boundary, the initial temperatureand material thermal parameters.In the process of thermal stress coupling analysis, analysis of the temperature load andthe weight of the concrete box girder stress. Derived temperature load on the box girder cannot be ignored.