简介:Itiswellknownthattherearesometorsionaldamagesinearthquakes.InTaibaipark,Jiangyoucity,Sichuanprovince,mostofthestonestatues,whichwereplaceduponthebanistersofonezigzagbridge,exhibiteddifferenttorsionalphenomenain2008Wenchuanearthquake.Thispaperintroducesthetorsionalphenomenaofallthestatuesonthezigzagbridgefirstly.Thenoneeccentricitymodelisestablishedandtheequivalentrotationalaccelerationsarecalculatedinordertoanalyzethecausesofthetorsionaldamage.Inaddition,thetorsionalcomponentsaresynthesizedbyusingtranslationaccelerationsrecordedatJiangyoustationintheWenchuanearthquake.Theresultsshowthattheequivalentrotationalaccelerationislargerthanthesynthesizedrotationalcomponents,whichsuggeststhatthetorsionalphenomenaofthestatuesonthezigzagbridgemightmainlycomefromitseccentricity.ThecomparisonbetweentheestimatedtorsionalcomponentatJiangyouandthatpresentedbyTrifunacshowsthattheyareinthesameorder.Theresearchim-pliesthatthetorsionalphenomenainearthquakesareverycomplicated,andnotonlycausedbytorsionalmotions.