Analysis of Reaction Spectrum REsponse of Cable-stayed Bridge under Combination Soism at Sifangtai

By example of some cable-stayed bridge project,applying the large-scale analitic program ANSYS of finite element,selecting units of spaces BEAM4 and LINK8 to establish the model for 3D dynamic computation for cable-stayed bridge and the modality analysis is conducted.On this basis,with Europe Specification,the paper analyses the cable-stayed bridge for reaction spectrum under the action of 3-directional combination seism,and gives the internal forces,the replacement and the seismic response of the main beam and tower.