Study On Sunshine Temperature Field And Centrifugal Force Effect Of Curved Beam Bridge

In recent years,with the development of China's economy,curved girder bridges are becoming more and more widely used in Expressway and urban overpass.In the three aspects of highway design,curved girder bridge can not only achieve smooth and reasonable plane,but also meet people's aesthetic vision requirements,so curved girder bridge is widely applied in practical engineering.However,due to the lack of understanding of the mechanism of the curved girder bridge,in recent years,many kinds of diseases have been exposed,especially the plane displacement problem of curved girder bridge,which has a great negative impact on the society.The scholars at home and abroad have studied the causes of the plane displacement of the curved bridge extensively and deeply.The results show that the temperature change and the centrifugal force effect of the vehicle load are the main reasons for the plane displacement of the curved beam bridge.However,the influence of the temperature change and the centrifugal force effect on the plane displacement,such as the force mechanism and effect effect of the curved bridge,is not clear.Few scholars have discussed the centrifugal force caused by the vehicle load in detail.In order to further analyze the influence of both on the lateral displacement of curved girder bridge,this paper carries out a series of analysis and Research on two aspects of temperature change and centrifugal force effect.(1)For temperature change,this paper studies the influence of sunshine temperature on the plane displacement of curved girder bridge.Compared with sudden cooling and annual temperature change,the sunshine temperature is mainly influenced by the solar radiation,the time is short and rapid,the distribution is uneven,the local stress is large and the most complex.This paper discusses the relevant parameters of the calculation of the temperature field in the natural environment of the curved girder bridge box girder structure,compares the relevant regulations of the normal temperature gradient in the highway code and railway code in China,and takes a ramp bridge in the Western Coastal Expressway of S32 as the research object,and uses the general finite element software MIDAS/FEA to carry out the curved bridge.The temperature field distribution of the box girder structure is obtained by two dimensional temperature field analysis.The distribution law is applied to the full bridge analysis.Finally,the distribution law of the temperature field of the curved beam bridge and the change law of the plane displacement of the curved bridge under the effect of the temperature load are obtained.(2)For the effect of centrifugal force caused by vehicle load,this paper first introduces the domestic standard calculation method of centrifugal force value,and compares it with the British and American norms.Taking the ramp bridge of the Western Coastal Expressway of S32 as the research object,the effect of the centrifugal force on the lateral slip of the bearing is simulated by the finite element software MIDAS/Civil,and the lateral slip of the bridge bearing by the centrifugal force caused by different curvatures of different curvature radius curved bridges is compared and analyzed.The degree of influence.Through the above research work,the purpose of the study is to find out the main causes of the transverse slip of the curved beam bridge and the extent of its influence,and hope to have some reference significance for the study of the curved beam bridge.