Asymmetric Continuous Rigid Frame Bridge Performance Study

With the vigorous development of transportation in our country, the highway mileage has been refreshed. Bridges, as an indispensable part of road engineering, also get continuously development. In southwest region of China, since it is moutainous in that area, the construction of bridge is more and more common. Also because of the restriction of geographical environment, construction of continuous rigid frame bridge, may cause damage to the local environment or dig a lot of mountain, so asymmetric continuous rigid frame bridge is applied to practical engineering gradually.Based on a symmetrical continuous rigid frame bridge, establish different length with cast-in-place cantilever construction of two T structure, its different asymmetry of long span continuous rigid frame model. Through the finite element software MIDAS/Civil into bridge after simulation and analysis, respectively asymmetric three span continuous rigid frame bridge is studied in the following questions:①. The formation of cantilever construction two T structure under the condition of the length is not the same, think is the ratio of the length range in a more reasonable.②. Two T structure with different beam height curve and curve of slab thickness, 2.0 T structure adopted in large parabola, small T structure using 1.5 parabola changes, its force and use the 2.0 parabola changes, were similar, the most important in the improvement of the beam end of bearing reaction force.③. Analysis of asymmetric continuous rigid frame bridge main pier, mainly study the asymmetry of continuous rigid frame bridge girder and the match problem between high and low piers, the analysis found big T structure section of the longitudinal displacement, so big T structure section of the pier height should higher than small T compose the height of the section of the pier.④. Taken with different pier cross-section form and double spacing between pier, found thin-walled double limb pier can effectively reduce the pier top bending moment, smaller than single column pier and stress level. Double limb spacing on the effects of a structure.