Analysis on load distribution of beam-arch combination system bridge

Abstract

Abstract Many prestressed concrete beam-arch combination system bridges have been built in China, but the research on the mechanical characteristics of beam-arch combination system bridges is insufficient. By adopting the structural mechanics and taking the three-span continuous beam-arch combination bridge as the research object, a theoretical formula for calculating the load distribution of the beam, arch and boom of the beam-arch combination system is put forward. By comparing the theoretical calculation with the finite element calculation, the theoretical calculation formula is verified, and the factors affecting the load sharing ratio and the bending moment distribution ratio are analysed. The results show that the load sharing ratio is less affected by the beam-arch bending stiffness ratio, and more affected by beam-to-boom equivalent stiffness ratio. The load sharing ratio increases with the increase of rise-span ratio and the decrease of side-to-span ratio. The beam-arch bending moment distribution ratio is related to the beam-arch bending stiffness ratio, the side-to-span ratio and the rise-span ratio, and beam-to-boom equivalent stiffness ratio.