| As a new type of bridge,the extradosed cable-stayed bridge has been increasingly used in practical projects.Thanks to the characteristics of the shorter tower,the characteristics of relatively rigid beam and the advantages of good economic indicators and elegant modeling,it has gained the favor of engineers.The following works are carried out for the background of Dujinggang jialing river bridge.Firstly,this thesis introduces the derivation and the development trend of extradosed cable-stayed bridge at home and abroad.It is a bridge between the continuous rigid structure and the traditional cable-stayed bridge,and some theories about the definition have been collected at home and abroad in this article.Secondly,the model of a bridge has been built.The sensitivity of the overall structural parameters and the local structural parameters were research respectively.The study of the overall structure parameters,which have some impacts on structural stress,is considered by the designers,including the Length of non-stayed cable segment?the Tower height and the Ratio of main span to side span.On the contrary,the local structural parameters are applied to the construction process.The main purpose is to determine the main structural parameters of structural stress and deformation during construction,so that we can pay more attention in the actual monitoring process.Thirdly,the least square method is used to identify the main structural parameters in this article.It can identify multiple parameters just one time.Through modifying the theoretical parameters of the original model,We can achieve the closer for better application later.In the end,the Hydrothermal analysis is over.The temperature field and stress field are compared on whether the cooling tube is used.By reasonable arrangement of cooling tube,the temperature difference between inside and outside of the concrete can decrease below 25 ? and the structure temperature stress is less than the allowable stress. |
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