简介:Thelong-spanbridgeresponsetononstationarymultipleseismicrandomexcitationsisinvestigatedusingthePEM(pseudoexcitationmethod).Thismethodtransformsthenonstationaryrandomresponseanalysisintoordinarydirectdynamicanalysis,andtherefore,theanalysiscanbesolvedconvenientlyusingtheNewmark,Wilson-θschemesorthepreciseintegrationmethod.Numericalresultsoftheseismicresponseforanactuallong-spanbridgeusingtheproposedPEMaregivenandcomparedwiththeresultsbasedontheconventionalstationaryanalysis.Fromthenumericalcomparisons,itwasfoundthatboththeseismicspatialeffectandthenonstationaryeffectarequiteimportant,andthatbothstationaryandnonstationaryseismicanalysisshouldpayspecialattentiontothewavepassageeffect.