Stability Analysis Of Continual Rigid Frame Bridge With High Piers In Construction

Years ago, the stability is the word only talked about the skew bridge, the ancon bridge and the arch bridge. As to the continual rigid frame bridge, the stability is usually not taken into account. But with the development of engineering construction technology in recent years, the continual rigid frame bridge is developing towards the high pier and long span, and tending to use high strength materials and thin wall structure in construction, so the stability problem is becoming more and more prominent day after day. And the literature of considering about the second type stability analysis of double nonlinear about bridge is rarely.Taking the Longtanhe Bridge on the Yichang to Enshi section of Hurong Speedway as the engineering background, this thesis carries out the eigenvalue stability analysis to the two T structure of the high pier of 178m and of 130m. Considering the second type stability analysis of geometrical nonlinear and of double nonlinear, it also makes the stability analysis to the wind-load effect here.The software used in this thesis is the Large Finite Element Analyze Software ANSYS. When building up the finite element analyze model, considering the hardware condition of current microkit and the request of analyze precision to the full, the writer mix-uses SOLID65, BEAM44 and LINK8 to fulfill the calculation on the general microkit, which needs not very much time on the machine.The thesis analyzes the effect of the temporary underprop in pier construction to the stability with the eigenvalue analyze method, and gets the conclusion that the horizontal temporary underprop dose not have much influence on the lengtheways sideslip stability, while the inclined temporary underprop and the transverse girder have obvious influence on it. The result of nonlinear analysis shows that the imbalance loads windward on the main girder of the transverse bridge effect little to the structure stability; the comparison of the second type of geometrical nonlinear and of double nonlinear shows that the material is nonlinear or not effects a lot to the result. So it is suggested that the material nonlinear influence should be taken into consideration when analyzing the stability of the high-pier and long-span bridge.The double nonlinear stability of the largest cantilever constructing moment of high pier with the wind-load effect is also discussed in this thesis and the conclusion is supposed to have some practical consulting significance to the engineering design...