Analysis And Experimental Study On Three -Span Continuous Beam-Arch Composite Bridge

The prestressed continuous beam-arch composite bridges are a special structural system where the horizontal thrust of the arch rib is absorbed by a prestressed tie at deck level. In some cases,this type of structure is preferable because it doesn't have the large thrust at the spring hi traditional arch bridges and the somewhat large bending moment and shear force in traditional beam bridges. As a result,the performances of the prestressing reinforcement can be efficiently utilized. In this paper,the studied works are list as follows:1) The theory of elastically supported continuous beam method is brought forward to transfer spatial continuous beam-arch composite bridges into plane structure. The plane finite element method is used to calculate inner forces and deflections of each beam and arch. At the same time,spatial finite element model is created for contrast. All of the researches are carried out on the background of a spatial continuous beam-arch composite bridges,and the relative loading experimental results are compared with the calculated values. It indicates that the theory of elastically supported continuous beam method load lateral distribution is a kind of simple convenience and safe practical engineering calculation method.2) The suspender force and correlated modality is analyzed with the use of general calculation program ANSYS .During testing suspender force,the influence of the rigidity of suspender must be considered.3) The influences on the internal forces by some variable parameters such as the ratio of the rise to span and the stiffness ratio are compared .The optimal range of these parameters is pointed out and some advances are also given.4) The lateral elastic stability of the arch rib with 3-dimention FEM program is analyzed,some influence factors such as suspender,arch rib and wind brace etc. are comprehended. The results may ensure the construction and be useful to designers.