Experimental Behavior And Finite Analysis Research On CFST

Though construction of CFST bridge in China started relatively late, with advantage of excellent mechanical properties, artistic appearance and a convenient construction, the CFST Arch Bridge has rapidly developed. CFST members’mechanical behavior. The stress of CFST Arch ribs are mainly axial compression and eccentric compression. Based on the mechanical characters of CFST Arch rib, this Paper lay emphasis on experimental and theoretical analysis, numerical simulation, the work and the conclusions as follow:(1) By designing and completing nine CFST columns compressional test, investigated its working mechanism and failure mode as well as analyzed eccentricity ratio, concrete strength, length to tube diameter ratio that three experimental factors affect the capacity and durability of CFST stub columns, indicate that eccentricity ratio is a main factor influencing the CFST columns’ capacity and different eccentricity ratio has a significant affluence in confinement effect.(2) After adapted the coordination that used by Deformation of performance of steel beams and concrete, tested the core concrete section stress, has disclosed the development procession of axial suppression members, and the conclusion released that eccentric suppression of concrete is well applied to the Plane-section assumption.(3) Properly choose the constitutive relations and failure criterion of reinforced concrete (RC). Introduced an infinite element analysis software ANSYS to do the numerical simulation about the members under axial and eccentric load. The result show in coincidence with the experimental result and disclose the compressional mechanism of the CFTS stub columns. Based on the correct verified model and change the Parameter of length to tube diameter ratio, conduct the reduction factor equation of CFTS slender high columns.(4) Based on the limit equilibrium theory, conduct bearing capacity equation of CFTS axial compressional column. As for concentric compressional members, introduce Concept of equivalent confining force as well as combine the limit equilibrium theory, here came the equation of eccentric member capacity related to CTFS stub column, and then compare the result of the calculation and experimental result, find that the two has a fine coincidence.