Arch Stability Study

The arch bridges span is so large and the long-thin is so great that the questions of arch bridge stability come out increasingly Depending on the cause that modem arches are parabolic and catenary mostly and they always bear with the vertical loading, so the conclusion that the coefficient of stability of circular arches in radial loading do not replace all arches is pointed out0 This text puts forward the concept of the equal loading for In-plane buckling of arch bridges, the buckling of circular arches can assimilate parabolic and catenary arches using the transforming of loading form even if the arrow- stride ratio is large 0 The lateral buckling of arches bridges happens easily during construction0 This paper accurately calculates the vertical distortion function of catenary arches via the Thaler transformation, gives the trend and influence degree on the arch type~ the arrow-stride radio and the radio of the resisting- torsion stiffness of arches and cross resisting-twisting stiffness for lateral buckling of arches bridges, especially introduces the influence of the arch-axis coefficients for lateral buckling of arches bridges, and finally presents the practical calculating methods for the buckling of catenary arch bridges0 Using the formula in this paper can calculate the coefficient of stability on arch bridges easily and nicely, the error compared with FEM is so small that the formula can be applied exactly on engineering...