Analysis Of Temperature Field And Temperature Effect Of PC Partial Cable Stayed Bridge

The PC Partial Cable-stayed Bridge has the characteristics of large stiffness,small deformation,strong spanning ability,beautiful shape,simple maintenance.It is very suitable to be a city landmark and become a beautiful card of the city.Because of the high requirements for the stiffness of the PC Partial Cable-stayed Bridge,the main girder forms are mostly complex,the cross section is generally large,and the top and bottom plate are generally thick.Under the sunlight,the temperature difference of the concrete box girder is obvious,and the temperature effect is significant.Moreover,The Partial Cable-stayed Bridge is affected by the temperature difference between the cable and the beam,and also has a significant effect on the structural stress.Therefore,it is very necessary to study the temperature effect of The PC Partial Cable-stayed Bridge under the sunlight.The thesis analyses the main temperature problems of The Railway PC Cable-stayed Bridge,including the temperature field distribution,the temperature stress of the box girder and the temperature gradient effect of the box girder.The main works are as follows:(1)According to the theory of Astrophysics and heat transfer and considering the influence of astronomical parameters such as temperature,atmospheric transparency,solar altitude angle and Bridge azimuth angle on solar radiation,the Python programming software is used to establish the transient boundary condition array of the temperature field.(2)Based on the testing data,the temperature field distribution of the main girder is obtained,and the most unfavorable temperature gradient function of the main girder is obtained by the least square method.(3)The two-dimensional thermal analysis model of the main beam is established by ANSYS.The temperature distribution of the main beam is obtained by the comprehensive temperature array of air medium.The temperature distribution of the main beam is obtained,and the most unfavorable temperature difference along the height and width direction is obtained according to the calculation results of the temperature field.(4)The two-dimensional model of box girder is established by ANSYS and The full bridge model is established by MIDAS/CIVIL.And the transverse temperature stress and longitudinal temperature stress are calculated by the models.(5)The influence of temperature gradient on The Partial Cable-stayed Bridge is studied and compared in the temperature gradient of different national norms.