INVESTIGATION OF THE BRIDGEʹS DESIGN CODES THROUGH NEAR FAULTʹSEARTHQUAKES

viewpoints of various design codes about vertical component of ground motions is reviewed. Design codes that have been reviewed in this study are: Iranian codes for seismic design of roads and railwayʹs bridges, Caltrans, Euro Code8, AASHTO , AASHTO Seismic Isolation Guide Specifications , AASHTO LRFD Bridge Design Specifications, ASCE ,IBC2012 and UBC97. Then a database consists of 31 near fault earthquake records is gathered and individual and mean and mean +/- standard deviation response spectra plotted for selected 31 earthquakes and by comparison with standard spectraʹs is showed that usual assumption that vertical component spectrum equal to 2/3 horizontal spectrum isnʹt correct in short period regions