Static And Dynamic Analysis Of Continuous Steel Truss With Flexible Arch In The Main Span Of Nanfeihe Bridge Of Hefei South Ring Railway

The steel truss flexible arch has the advantages of strong vertical stiffness, long span, and small weight with a sense of beauty. As a structure, it can be simply constructed and save materials with high material utilization. With perfect driving performance than other structures, it is widely used in the high-speed railway construction. In this thesis, on the background of the design proposal of Nanfeihe Bridge which is a (150+230+150)m main span through-type steel truss flexible arch bridge, the FEM software MIDAS/CIVIL is introduced to establish the spatial finite model of bridge with the elementary beam theory and to simulate the loading capacity and dynamic characteristics analysis. The spatial behavior of the entire structure is researched.Firstly, this thesis briefly introduces the status development and structural features of railway arch bridge at home and abroad. Then it tells the engineering background and the specific structure design proposal of Nanfeihe Bridge and describes the details in modeling. After that, the structure behavior and the deformation during operation stage which is under the load combination of dead load, live load, braking force, nosing force, system temperature, sunshine and wind load etc. are calculated with MIDAS FEM model. In the dynamic analysis, the natural period of bridge vibration and mode of vibration are calculated by subspace iteration method. And the seismic response analysis is also made with response spectrum method and the structural earthquake resistant behavior is verified. Based on the seismic checking calculation, some reasonable advises are proposed for anti-seismic design of structures.