Study On Design Parameters Of Tied-Arch Bridge Structure In High Speed Railway

In this thesis, the finite element program is used to investigate the structural design parameters of a steel tied-arch bridge engineering in high-speed railway. The main work is as follows.First, the influence of ratio of rise to span, ratio of beam-arch stiffness, suspender type on the structural static characteristics is studied in detail. Simultaneously, the influence of leaning angle inside of arch rib and suspende type on the natural frequency is investigated. The structural scheme which has the better dynamic characteristic is pointed out.Second, the formula of lateral stability of tied-arch bridge considering the flexural rigidity of rigid hangers is deduced using the principle of the minimum potential energy. The FEM is used to validate the formula's accuracy. The influence of horizontal joint type, hanger type, leaning angle of arch rib, section characteristic of rigid hanger on the lateral stability of the bridge is also researched. Some suggestions on those parameters are provide.The research results in this thesis are useful for the design of tied-arch bridges in high-speed railway.