Abstract: The structural dynamical characteristic is the foundation to research the structural dynamical performance such as vibration-resistance,and it is greatly important to calculate correctly the structural dynamical characteristic of new structures for long-span concrete filled steel tubular arch bridges.In the paper,seismic analysis methods are summarized,and through establishing the spatial calculating model and seismic wave,utilizing ANSYS program,making use of response-spectrum methods and time-analysis methods,and considering ground movement and wave effects,the seismic response of Ya Ji Sha Bridge regarded as the research object is calculated.The result is compared with one carried out by Natural Lab Preventing Tragedy in Civil Engineering of Tongji University and some outcome is obtained.It provides a basic reference for the future research work for seismic ansysis of concrete filled steel tubular arch bridges.

Key words: concrete-filled-steel-tube； arch bridge； seismic response； ANSYS program； structural dynamical characteristic；