Effects of Arch Rib Crossbars on Dynamic and Stabilization Characteristics of Concrete Filled Steel Tubular Arch Bridge

Abstract

Considering the influence of crossbars of arch rib of CFST arch bridge on vertical bending rigidity and torsional rigidity of the whole bridge system, the space finite element calculating model for a CFST arch bridge with span of 400 m was set up by using common software ANSYS. Based on 8 operating mode, the dynamic performance and steady safety factor were calculated, and the effects of location, formation and quantity of crossbars on dynamic and stabilization characteristics were compared and analyzed. The results show that (1) transverse affiliations must be setup for arch springing and crown of large-span CFST arch bridge; (2) arch springing crossbar have less effects on in-plane basic-frequency than that on out-of-plane basic-frequency and structural stability; (3) arch crown crossbar have less influence on out-of-plane basic frequency, in-plane vertical basic frequency and stability than that on torsional basic frequency. When the quantity of crossbars is hardly changed, it is suggested to use “K” crossbar which has more obvious influence on the dynamic and stabilization characteristics.