外包钢板加固钢筋混凝土桥墩锈蚀后的力学性能-研究

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1、上海交通大学硕士学位论文锈蚀位置、厚度方向锈蚀深度以及锈蚀影响范围等密切相关，而翼缘底部宽度方向局部锈蚀时桥墩水平承载力的退化程度仅与厚度方向锈蚀深度以及锈蚀影响范围相关，与锈蚀位置无关；随着钢板与混凝土界面粘结性能的不断退化，两者协同工作能力不断下降，桥墩的水平承载力也逐渐降低。（3）建立以底部钢板锈蚀程度、钢板与混凝土界面粘结性能为变化参数的三维弹塑性有限元分析模型，从骨架曲线、延性系数、刚度退化系数、等效粘滞阻尼系数等四个方面研究上述变化参数对桥墩抗震性能的影响。计算结果表明，随着钢板底部锈蚀情况越严重，其抗震性能越差；钢板与

2、混凝土间粘结性能越好，则其抗震性能越佳。以上研究成果有望为现役桥墩的维护管理与加固提供参考依据。关键词：外包钢板加固、钢筋混凝土桥墩、锈蚀模式、粘结性能、水平承载力、破坏模式、滞回性能II万方数据上海交通大学硕士学位论文STUDYONMECHANICALBEHAVIORDEGRADATIONOFREINFORCEDCONCRETEBRIDGEPIERSWRAPPEDWITHSTEELPLATESDUETOCORROSIONABSTRACTConsideringviaductsasanimportantpartoftransporta

3、tionnetwork,itwilldetermineifthereliefsuppliescanbesmoothlytransportedintothestrickenareaandtheinjuredpeoplecanreceivetreatmentintimeduringsevereearthquake.Therefore,thesecurityofviaductsplaysanimportantroleinseismicdesign.Manysurveysshowthatseriousdamageorevencollapse

4、ofbridgeduringanearthquakeismainlyduetothedestructionofthepiers.Becausereinforcedconcretebridgepiersareliabletodamagenearthepierbaseduringtheearthquake,bondingsteelplatesoutsidethereinforcedconcretepiersiswidelyusedasaretrofittingmethod.However,corrosionphenomenonofste

5、elplatesisoftenobservedduetowaterloggingorcorrosionenvironments.Towhatextentthecorrosionaffectingthepiersneedstobecarefullystudiedthroughexperimentsandnumericalanalyticalmethod.Theobjectofthisstudyisthereinforcedconcretebridgepierswrappedwithsteelplates.Two-dimensional

6、andthree-dimensionalelasto-plasticfiniteelementformulationareemployedtoinvestigatetheeffectofcorrosionmodeandsteelplate-concretebondingbehavioronthelateralbearingcapacityandhystereticbehaviorofthepiers,whichcorrodeatthepierbase.Themaincontentsandconclusionsofthisthesis

7、areasfollows:(1)Two-dimensionalelasto-plasticfiniteelementformulationisemployedtoinvestigatetheeffectsofsteelplates’corrosionrateandcorrosionmodeonthelateralbearingcapacityofthepier.Itisobservedthatlateralbearingcapacitydecreaseswiththeincreaseofsteelplates’corrosionra

8、te.Thedegradationofthelateralbearingcapacityresultedfromtheweb’sIII万方数据上海交通大学硕士学位论文localcorrosionmodeismoreserioustha