LAUSR

Abstract The main objective of this study is providing comparative results of cable stayed bridges under non-uniform and uniform excitations and identifying the key parameters and elements for seismic design purposes. For this purpose, three cable stayed bridges were modeled in SAP2000 software and imposed to uniform and non-uniform displacement time series. Four different soil types were considered for generating sixteen different load cases. Twenty displacement time series, generated using spectral representation method, were considered in each load case for obtaining the statistical characteristics of responses. Bridge responses were obtained in terms of girder, pylon and the cable's internal forces. Results of this research indicate that depending on the soil type beneath each support, the response of bridge may vary significantly. Deck and pylon stiffness are important parameters for describing the amount of girder moment or cable's axial force amplification. Girder moment, cables axial force, pylons shear and pylons drifts are amplified up to 1.8, 1.4, 1.48 and 3.1 respectively in the worst load case.