Modified spectral format based on probability level using site-specific uniform hazard spectrum

Abstract Deficiencies of the four spectral formats i.e., 2%/50-yr, 5%/50-yr, 10%/50-yr and AASHTO (American Association State Highway Officials) 2009 demand modification for bridge design application in Canada. Among them spectrum is dropped from current investigation as its difference with Canadian Bridge Design Code (CHBDC) 2006 too large to modify. This study introduces an approach calibrating on values elastic seismic response coefficient provide a new shape based modified 5%/50-yr formats. A Digital Visual Fortran program was prepared determine optimum factors incorporated into three calibrated data 389 cities Thus, here it developed strategies modifying best probability level CHBDC using site-specific Uniform Hazard Spectrum (UHS). Finally, select most suitable format apply base shear calculations bridges