Infulence of mechanical behavior of variational arch rib section on rigid tied arch bridge analysis

Based on a 96-meter-span rigid tied arch bridge,variational arch bridge models are established in this paper.The influences of variation arch rib section on the mechanical behavior of this system bridge are studied.Analytical results show that the variational arch rib section would have greatest impact on its deformation and stress.It also have large impact on bridge dynamic characteristic and stability but there is slight influence on tied bar.The results show that for the sequential variational arch rib section on about 100-meter-span rigid tied arch bridge when the area ratio of vault and the foot of arch is 5/6,the mechanical behavior of overall bridge is the best.