简介：Todevelopuniformandseismicenvironment-dependentdesignspectrum,commonaccelerationresponsespectralcharacteristicsneedtobeidentified.Inthispaper,abi-normalizedresponsespectrum(BNRS)isproposed,whichisdefinedasaspectrumofpeakresponseaccelerationnormalizedwithrespecttopeakaccelerationoftheexcitationplottedvs.thenaturalperiodofthesystemnormalizedwithrespecttothespectrumpredominantperiod,Tp.Basedonastatisticalanalysisofrecordsfromthe1999Chi-Chiearthquake,theconventionallynormalizedresponsespectrum(NRS)andtheBNRSareexaminedtoaccountfortheeffectsofsoilconditions,epicentraldistance,hangingwallanddamping.ItisfoundthatcomparedtotheNRS,theBNRSismuchlessdependentonthesefactors.Finally,somesimplerelationshipsbetweentheBNRStoraspecifieddampingratioandthatforadampingratioof5%,andbetweenthespectrapredominantperiodandepicentraldistancefordifferentsoiltypesareprovided.