The Wind Response Analysis Of The Continuous Long-Span Rigid Frame Bridge With High Piers

With the increase of the span ,the stiffness and damping of the bridge is incessantly declining due to its slenderness trend,and it makes the sensitivity of the structure to wind increasing. Wind-resistant becomes an important part which cannot be neglected in the design of the long-span bridge. The wind speed in the top of the pier and the deck of the long-span continuous rigid frame bridge which is along the river and sea or in the mountainous area is often very high,making that the wind load which acts on the bridge is very heavy. This kind bridge is sensitve to wind because of its long span,lightness in weight and inhernet flexibility,so to do the wind response analysis of this kind bridge has important significance.Firstly, this paper begin with the thoery of Shinozuka,the wind turbulence time histories are generated by using the harmonic wave method which is presented by George Deodatis,and the Fast Fourier Transform technique is imposed into the algorithm.The spectrum and the correlation are also be verified.Secondly, the longest twin-cantilever stage and the post-construction stage finite element model of Xi aoshawan Yellow River Bridge are established by using finite element analysis software ANSYS and the dynamic characteristic of the two models are analyzed.Finally, the static gust response of the two models are calculated.The galloping and flutter stability of this bridge are judged.The author analyzes the buffet response of this bridge and compare the result with the static gust response. From the result,the autor finds that the force and the stress of the static gust response are larger than those of the buffet response.It illustrates that the gust factor in"Wind-resistent Design specification for Highway Bridges"is reasonable. In addition,the turbulence augment factor of the longest twin-cantilever stage is bigger than that of the post-construction stage,this illustrates that the longest twin-cantilever stage of this bridge is more sensitive to wind and it should be pay attentioned in the construction.Above all, the present results can provide a practical reference for the wind response analysis of the same kind bridge.