Analysis Of Urban Single-Column Pier Curved Girder Bridge Overturning Stability

With the rapid development of economy in our country, the city’s transportation system is facing tremendous pressure. Affected by urban space and the road surrounding terrain, topography and other factors, the city overpass and viaduct have become an effective measures to alleviate the current situation of heavy traffic road congestion. In the city bridge construction, single-column pier continuous beam bridge has a lightweight form, a good permeability under the bridge and wide vision.At the same time, this kind of bridge is easy to adapt to the terrain, which makes the overall structure and the surrounding environment in harmony. Thus it is widely used in the ramp section of city important transport hub overpass beam. Compared to the straighe line bridge, the stress of curve girder bridge is more complex. Lots of beam overturning accidents occurred under "bending and torsion" coupling effect in such structures bridges, which brought huge losses to people’s lives and property, and caused negative impact There is no specific guidance for calculation of overturning stability in superstructure of the bridge in the current highway bridge related specifications designers are mostly refer the experience of linear beam bridge to design the curve beam bridge, so there are security risks. In view of this, study on mechanical characteristics of curved bridge has important theoretical significance, engineering value and enormous social economic benefits, especially on overturning stability of single-column pier curve girder bridge. In this paper, according to the mechanical characteristics of urban single-column curved bridge, using Midas Civil finite element analysis, combined with the actual project, explore the specific analysis of factors that affect the superstructure stability against overturning in single-column pier curve beam bridge. The main contents are as follows:(1) The mechanical characteristics of curved bridge are analyzed and summaried. The theory of computation and finite element analysis methods are outlined. The research significance and research status of stability problems in curve beam bridge are expounded.(2) Reference to the related specification, the overturning stability coefficient and calculation method are introduced. Combined with the actual project, the lateral stability of curve beam bridge are particularly discussed and analyzed. Two kinds of lateral stability issues including warping and overturning are analyzed.(3) Combined with the actual project, the method of determining overturning axis in single-column pier continuous girder bridge is studied. And comparative analysis is carried on with draft for related specification.(4) The factors of overturn stability coefficient in single-column pier supported curved continuous beam bridge is studied. Using Midas Civil finite element analysis, combined with the actual project, including the radius of curvature, the span length, the bridge width, bearing arrangement, the pre-eccentricity and vehicle load, the factors that effect to overturning stability are esplored and analyzed.