Stability Analysis Of Concrete Continuous Rigid Frame Railwaybridge With Tall Pier And Large Span

Because of high pier and large-span continuous rigid frame bridge has built, the structure and operation during the construction of the study of stability has become a hot topic.Once the world has a lot of bridges because of instability and loss of load-bearing capacity of the accident, Bridge the existing regulations did not specifically note this, so to do some research in this area is very necessary.Qing Hegou Bridge is located in Shanxi province, across the Qing Hegou and the Qingdao-Yinchuan Highway for long-span continuous rigid frame high pier straight railway bridge, the use of 78 +3×134 +78 m prestressed concrete box girder, beam body as a single box, changing the structure of highly variable cross-section. In the fulcrum of the high-9.3m, and in cross-beam high beam 4.8m, the highest pier is up to 103m, In addition to the starting point the use of dugging pile foundation, the other piers are 1.5m and 2.0m diameter pile foundation.Thesis set up two computing models, separately considered the pile - soil interaction as well as the consolidation pile connections of structural stability.Ordinary reinforced and prestressed steel beam affected the stability of the structure at such a thesis in this article are an innovation.Pre-stressed than those that do not take into consideration the role of the stability of pre-stressed, and about 7%, the general effects of reinforcement stiffness on the bridge is very small, the stability coefficient will remain basically unchanged.Thesis using a large finite software MIDAS/CIVIL calculated ndanalyzed separately after completion of the main pier at Pier weight, vertical wind and horizontal wind load of high pier autologous stability, minimum stability coefficient 349.7; maximum cantilever pouring on the main pier onstruction when the largest cantilever in the vertical wind, horizontal wind, vertical wind load, dead load and hanging basket error at the time of the largest cantilever stability analysis, the minimum stability coefficient 113.7; full-bridge completion After entering the stage at the use of self-respect, two dead load, temperature loading, in the live load, the stability of prestressed combined, minimum stability factor 125.3.Through the analysis: the structure at the largest cantilever status when considering the stability of hanging basket error drop the smallest coefficient.In order to more accurately imulate the actual structure, this paper consider the pile - soil inter-action at the argest state of the cantilever stability, obtained by comparing, in the same conditions, taking pile - soil interaction than the stability of small rigid foundation , small of about 17.0%.In addition, using a large-scale finite soft -ware ANSYS, with the establishment of BEAM188 unit finite element analysis model, the largest cantilever bridge in the state fall under hanging basket error when the geometric nonlinear stability analysis and geometry, material nonlinear stabilityof double analysis。The results show that: the structure with sufficient safety reserves.