Effective framework for seismic analysis of cable-stayed-bridges, Part 2: Analysis’ results

Referring to the article named “Effective framework for seismic analysis of cable-stayed bridges, part.1” in which the studied structure and its modeling are discussed, in this second part one present the study of the values of the monitored parameters in a statistic way. This in an important aspect in order to evaluate if the number of the considered seismic events may be enough to obtain reliable results. The spatial variability of the ground motion is modelled taking into account a time delay of the displacements imposed at the interaction points structure-terrain. The displacements have been obtained from the integration of artificial generated accelerograms, spectra-compatible with the ones suggested by the Eurocode 8. The time delay between the arrival of the seismic waves at the interaction points structure-terrain depends on the propagation velocity of the shear waves. It is been considered the structural response, with the imposition of the same seismic event, under 10 different velocities of the shear waves, from 200 m/s to 1000 m/s, with the purpose of studying eventual critical aspects of the structural response. The structural response of the bridge is evaluated studying the time histories of 10 monitored parameters, kinematical and tensional.