Study On The Influence Of Supporting System On Temperature Effect Of Concrete Curved Box Girder Bridge

With the rapid development of social science and technology,the civil engineering industry in our country has been developing rapidly.There are more and more forms of bridge in recent years.Curved Girder Bridge is widely used for its advantages,such as good driving safety and comfort,in accordance with the bridge aesthetics,saving the cost of construction and reducing the difficulty of construction.However,structures of curved girder bridge will appear varying degree of damage due to the long-term effects of various factors.Because of the complexity of space force,the significant characteristics of curved box girder bridge is the bending moment and torque would appear in the same time and interact when the vertical loads act on curved box girder bridge,which is called bending-torsion coupling effect.On the basis of reading a large number of relevant literatures,it was found that the temperature load had a great influence on the displacement,the support reaction and the stress of the curved girder bridge;Moreover,it was also found that the arrangement of different supporting systems has great influence on the performance of curved girder bridges.However,most of the literature was only to study the influence of temperature load on the curved girder bridge or the influence of the supporting mode on the performance of curved beam bridge.In other words,the literature about the effect of the supporting system on the temperature effect of curved girder bridge was not much.Therefore,in this paper,two factors were combined to study the effect of different support systems on the temperature effect of curved girder bridges.The main research contents of the thesis are listed as follows:(1)The force characteristics of the curved beam bridge and the arrangement mode of the support were introduced in detail.In addition,the temperature load of curved girder bridge was also analyzed in detail;According to the theory about the thermal stress of prestressed concrete structure,the theory of the temperature stress was discussed and analyzed;various countries on the relevant specifications of the temperature load were introduced and compared with each other.(2)Finite element analysis software was used to establish the finite element model of curved beam bridge.Under the conditions of vertical temperature gradient load and system temperature load,the influence of five different kinds of support systems on the displacement,the support reaction and the stress of the curved girder bridge were studied and analyzed.(3)Under the conditions of temperature gradient load and the system temperature load,the influences of five kinds of supporting systems on the curved girder bridge were compared and analyzed.In view of this,a more reasonable supporting layout was given.Moreover,we had put forward the corresponding suggestion on the design and the structure construction.We hope that this study can provide a certain reference for the actual project.