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ID:14369291
大小:191.00 KB
页数:78页
时间:2018-07-28
《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》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
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
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