Analysis Of Temperature Effect Caused By Sunshine On High-speed Maglev Composite Guideway

Maglev transportation has many advantages,such as fast speed,comfort,low noise and so on.At present,there are no examples of high-speed maglev traffic with a speed of 600km/h in the world.And the existing guideway cannot meet the long-term development of high-speed maglev traffic.Based on the existing engineering examples,related patents and specification,the structural form of the composite guideway is proposed.Then,the temperature effect of composite guideway is explored,which provides a reference for practical engineering.The existing specifications for the temperature deformation control of guideway is based on Shanghai maglev system,and the existing specifications are too strict.The applicability of the specifications to composite guideway remains to be discussed.Based on the experimental data of existing papers,this paper uses ANSYS to simulate the temperature effect of the box girder to verify the correctness of the finite element method.Based on that,this paper analyzes the temperature effect of composite guideway in detail,and obtains the vertical and lateral temperature deformation control indicators of composite guideway.The results show that the vertical temperature deformation should consider the temperature effects of the upper guideway and the lower box girder at the same time,and the lateral temperature deformation should be mainly based on the temperature deformation of guideway.Geographical location,shielding,and wind speed have a great impact on the temperature effect of the lower box girder.This paper uses ANSYS to analyze the effect of different parameters on the temperature effect of box girder.The results show that the geographical location has a greater impact on the temperature extremes of the box girder,but the temperature gradient of the box girder can be expressed by the same formula.The temperature gradient of the box girder is different from the specification,and the main difference is that the temperature difference does not decrease in one direction,but the temperature deformation is basically the same.Shielding change the temperature distribution of top plate,and the vertical and horizontal temperature deformation of the box girder decreases.The occurrence time of the most unfavorable horizontal temperature deformation changes.As the wind speed increases,the vertical and horizontal temperature difference decreases,and the temperature deformation of the box beam is reduced.