差动激励下海床-桩-墩-桥体系的地震弹塑性(ii)：工程应用

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1、第卷第期工程力学Vol.No.年月ENGINEERINGMECHANICSMarch2013差动激励下海床-桩-墩-桥体系的地震弹塑性（II）：工程应用与参数敏感性分析柳国环1，2，等（1.天津大学，建筑工程学院，天津，300072；2.清华大学，土木水利学院，北京，100084）摘要：首先，建立大跨海床地基-桩-墩-桥结构体系空间数值模型，包括粘弹性人工边界、悬索找形几何非线性、桩-土接触非线性以及钢筋混凝土材料非线性。其次，计算和对比考虑地基和人工边界条件与否的三种结构体系模态。同时，生成地基输入位置的多点地震动。然后，重点在性质考察构件进入塑性对地震输入空间变异性，人工边界条

2、件和接触非线性的敏感性；进而，量化给出拟静力与动力反应贡献比例，认识体系塑性铰出现时间、位置及其分布规律。结果表明：（1）结构体系的水动质量与人工边界条件影响不容忽视；（2）塑性铰对于一致与差动输入敏感，影响分布规律和破坏模式；（3）拟静力影响源于不均匀输入导致的反应不一致性，动力作用影响源于频谱；（4）随地震强度加大，塑性反应对接触非线性的敏感性加强，破坏为严重。关键词：跨海大桥；粘弹性人工边界；多点地震动；塑性铰；破坏模式；拟静力Elasto-plasticityAnalysisofBridgeAccountingforSpatialVariabilityofEarthquak

3、eMotionandSeabed-pile-piers-bridgeInteractionPart(II):ApplicationandParameterSensitivityAnalysisLiuGuohuan1,2，etc(1.SchoolofCivilEngineering,TianjinUniversity,Tianjin,300072;2.DepartmentofCivilEngineering,TsinghuaUniversity,Beijing,100084）Abstract:Athree-dimensionalfiniteelementmodeloflarge-sp

4、anseabed-pile-piers-bridgeisestablished.Inthemodel,thevisco-elasticartificialboundarycondition,form-findingofsuspension-cableforthegeometricnonlinearity,pile-soilcontactandmaterialnonlinearityareconsidered.Themodalanalysisofthebridgesystemconsideringsoilandartificialboundaryconditionornotareco

5、nductedandcompared.Themultiple-pointearthquakemotionsatundergroundlocationaregeneratedandverified.Then,thesensitivityanalysisabouttheplastichingesoccurrenceanddistributiontothevariabilityofspatialearthquakemotions,artificialboundaryconditionandcontactnonlinearityareanalyzedindetail.While,relat

6、ivecontributionofpseudo-staticanddynamictothetotalresponseareanalyzedandgiven.Further,locationanddistributionregularityincludingtheoccurrencetimeofplastichingesarefullyrecognized.Resultsshowthat(1)Theeffectofsoilandartificialboundaryonstructuralresponseissignificantandnotbeignored;(2)Theplasti

7、chingesdistributionregulationandfailuremodeareverysensitivetouniformandmultiple-pointearthquakemotionsinput;(3)Theinfluenceofpseudo-staticanddynamicactionisrespectivelyduetotheuniformityandfrequency-spectrumcharacterofearthquakemotionsa