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时间:2018-05-17
《差动激励下海床-桩-墩-桥体系的地震弹塑性(ii):工程应用》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
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
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