Analysis Of Mechanical Characteristics Of Concrete Filled Steel Tubular Arch Bridge With Inverse Bending Arch

Concrete filled steel tubular arch bridge with inverse bending arch is first emerge in china.This bridge style is very graceful and reasonable in structure.With the increase of our national power,people have more and more requirements in bridge aesthetics, concrete filled steel tubular arch bridge with inverse bending arch will get widely applied in engineering field.The lineartype of main rib is different from sub rib which is reverse bending curve nearby the position corresponding to main rib skewback. The side span of the arch bridge can use the form of half arch or rigid frame.In view of this bridge style is first emerge in china, it is necessary to have depth analysis on mechanical characteristics. The paper combining with Gao Yang brigde which has been designed, establishes its spatial finite calculated model with finite element program. /Finite element method is adopted for checking computations of the structure behavior during construction and after completion. / At the same time ,the paper combining the existing design standards of concrete filled steel tubular structure,calculates deformation of modulus of concrete filled steel tubular and its bearing capacity of the singal string. In addition, the paper discuss the application of the standards when engineer design the concrete filled steel tubular arch bridge. By calculating, conclude that this type of arch brigde first appear instability out of plane, the relative rigidity is lower and belongs to flexible sructural system.In order to understand the mechanical characteristics of this bridge style more deeply.we have a common parallel arch to calculation comparison with concrete filled steel tubular arch bridge with inverse bending arch.to investigate the difference of internal force on across section of arch ring ,the thrust at springer, the stability of two bridge style. Engineering advice is given,the present results can provide a practical reference for design and construction of the concrete field steel tubular arch bridge.