高桩码头在地震作用下的单模型谱方法位移扩大系数研究

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1、高桩码头在地震作用下的单模型谱方法位移扩大系数研究//.paper.edu.cn-1-ParametricStudyonDisplacementAmplificationFactortoEquivalentSingleModeSpectralMethodforSeismicAnalysisofPile-SupportedWharvesPhamNgocThach1,LuZiai21.FacultyofConstructionEngineeringUniversityofTransportinHochiminhHochiminh,V

2、ietnam2.CollegeofTrafficandOceanHohaiUniversityNanjing,China(210098)AbstractForcode-baseddesignprocedureofpile-supportedwharves,theEquivalentSinglemodeSpectralMethod(ESSM)isanapproachoftenpreferredbydesignersbecausetheanalysisisonlyperformedonasimplifiedtwodimensiona

3、lmodelinsteadofathreedimensionalmodel.However,thevalidityofthemethodisstronglydependentontheaccuracyofDisplacementAmplificationFactor(Fa)whichaccountfortorsionalcomponentsofresponseandmulti-directionaleffectsofseismicexcitation.ThispaperpresentsaparametricstudyonFaus

4、ing2520wharfsampleswithdifferentconditionsofsoilandstructure.TheproposedapproximatecurvesofFafromthisstudyareusefulfortheapplicationofESSMtowharfdesign.Keywords:pile,wharf,seismicanalysis,amplificationfactor1.IntroductionWharvesconsideredinthisstudyaresinglewharfsegm

5、entswhicharecomposedofadecksupportedbyverticalpiles(fig.1).Thefreelengths(un-supportedlength)ofpilesinatransverselineofpilesvaryfromlandwardtoseawardbecauseoftheslopingdikeasshowninfig.1bandthatinalongitudinallineofpilesareuniform.Awharftendstobehaveasasimpleone-degr

6、ee-of-freedomstructureundertransverse(perpendiculartotheshoreline)componentofseismicexcitation.Themaincomplexityarisesfromthesignificanttorsionalbehaviorunderlongitudinal(paralleltotheshoreline)componentofseismicexcitation.Theobjectiveofdynamicanalysisistoestimatetar

7、getdisplacementatcriticalpiles,circledinfig.1a,undertransverseandlongitudinalcomponentsofseismicexcitationappliedsimultaneouslywhichisknownasthemulti-directionaleffectsofseismicexcitation.Thereareseveralproceduresavailableintheliteratureforseismicanalysisofwharfsucha

8、sthosegivenin[1],[2],[3]and[4].Ingeneral,theycanbedividedintotwocategories:Timehistoryanalysis(dynamicanalysisusinggroundaccelerati