Arch bridges constitute a major component in the long-span bridge category.Because of its high bearing capacity,efficient utilization,saving,low cost and aesthetics.However,arch bridges transmit the applied loads to axial force mainly,which makes arch bridges uniquely susceptible to buckling failure,especially with the slender arch ribs and stiffness decreased.A three dimensional finite element model of GuoHeⅢBridge(the concrete filled steel tube bow string arch bridge) built by using the analysis s...