Research on lateral stability influenced by inclined angle of through X-type double ribs arch bridge

With spatial finite element method (FEM) analysis, the relationship between optimum arch ribs inclined angle and other structure parameters of through X-type double ribs arch bridge is analyzed. By the regression methods, optimum arch rib inclined angle approximate expression of through X-type double ribs arch bridge is gained. The results indicate that if the inclination of rib can improve the lateral stability of arch depends on some parameters, such as the width-span ratio of arch, the flexural rigidity of crossbeams in arch rib tangential plane, and the number of crossbeams. With the reasonable inclined angle, the lateral stability of arch can be improved efficiently, and the economic benefits can be achieved.