Analysis Of Wind-Resistant Behavior Of Xinjia Bridge In Yingtan

As well as constructs the new technical appearance along with the bridge structure theory's consummation, The great span bridge as well as the new bridge receive the designers' affection more and more. The bridge elegance vibration is the noticeable important attribute in the bridge design.Because span enlargement with style change, The bridge rigidity and the distortion can increase correspondingly, Conducting the wind resistant performance analytical study appears especially important.Taking the project of Xingjiang Bridge in Jiangxi Province for example,the main girder section of Xingjiang Bridge were analysised by means of CFD method,and got coefficients of tri-component.This paper calculated the dynamic behavior of both most single and double cantilever as well as the whole bridge by a general finite element program ANSYS, analyzed its flutter stability and static wind stability. Some suggestions for the wind-proof design of this cable-stayed bridge were proposed, which offer reference to the design and construction of similar bridges.The work of this thesis mainly ineludes the several Parts asfollows:(1) Reviewed and sum up the current wind resistant performance's study comprehensively.(2) Collected wind environmental data of this bridge, determined this bridge's basic wind speed and the design wind speed according to the statistics and the standard;(3) Is unable limited to the wind tunnel test to implement, In synthesizes the predecessor research results in the foundation. chosen the reasonable computation territory,modeled by CAD,carried on the reasonable grid division and so on, Finally used the FLUENT computation to obtain coefficients of tri-component. Provided the data for the static wind stability checking calculation.(4) Calculated the dynamic behavior of both most single and double cantilever as well as the whole bridge by a general finite element program ANSYS, analyzed its flutter stability and static wind stability. Analyzed the dynamic characteristics, In addition, analyzed auxiliary pillar's establishment regarding bridge wind resistant performance influence.(5) Analyzed the flutter stability and static wind stability of Xingjiang Bridge.The computed result indicated:The reverse mode of vibration appears late, twist frequency is quite big. Not only being in the bridge stage,but also in the construction stage, flutter critical wind speed higher than the flutter examination wind speed, the flutter instability will disappear.Girder appears crosswise swinging easily in the finished bridge state. Needs to carry on the temporary reinforcement measure in the wind speed great season to the girder. The auxiliary pillar's establishment improved this bridge's mechanical properties, however actually reduced the bridge wind resistant stability. Not only being in the bridge stage,but also in the construction stage,critical wind of static torsional divergence is very high,the static stability is good.