大跨高墩连续刚构桥延性抗震分析

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1、华中科技大学硕士学位论文大跨高墩连续刚构桥延性抗震分析姓名：刘小林申请学位级别：硕士专业：桥梁与隧道工程指导教师：张海龙20061030华中科技大学硕士学位论文AbstractTheprocessofmodernizationismoreandmoredependentoncommunicationandtransportationwiththerapiddevelopmentofcitiesinthepresentday.Meanwhile,theearthquake-induceddestru

2、ctiontobridgesintransportationnetworkswillleadtomoreandmoreenormousdamagetopeople’slifeandpropertyaswellassomeotherindirectpecuniaryloss.Theestablishmentofanti-seismicdesignmethodandtheusageofefficientanti-seismicmeasuresstandrightontheearthquake-indu

3、ceddamageanditsmechanism.Long-spancontinuousrigidbridgebecomeoneofthemostpopularstructureformsduetotheperfectionofthepre-stressedconcretetechniqueandthecantileverconstructionmethod.Bridgeswithgreatheightarecommonlyneededtobebuiltinmountainousarea,whic

4、hrequeststhebridgestohavehighandevenhollowpiers.Althoughthecontinuousrigidbridgeownsmeritsofitsanti-seismicperformanceasitspierandgirderarefixedtogether,theearthquake-induceddisplacementofthepiers’topwillremarkablyinfluencetheinnerforcedistribution,wh

5、ichmaypossiblycausepartialdamagetothebridgestructure.Intherecentdecadeyears,piercolumns’breakingdownispresentedasanewcharacteristicofearthquake-induceddamagetobridgestructures.Thedamagearisesfirstofallfrombridges’piercolumns,whichmayresultinthecollaps

6、eofthewholebridgestructure.Therefore,theanalysisofseismicresponseofthebridges’pieriscriticaltotherelatedresearchonthewholebridgestructure.Atpresent,theseismicperformanceofthin-wallpieranditsductilitypropertyarerarelyresearchedandthestatementaboutthisf

7、ieldismentionedscarcelyinthecodesforseismicdesign.Itisaworkofgreatsignificancetomakeresearchontheseismicperformanceofthin-wallpier,asitwillsupplementthecodesforbridgeseismicdesignofourcountry.Takingaccountofthesituationoftheresearchontheseismicrespons

8、eoflargespanbridgestructures,makingtheuseoftheXiaoshawanYellowRiverBridgeoftheNeiMongolAutonomousRegionasanexampleforanalysis,accordingtotheprincipleofmultileveldesignmethod,ductilitydesignmethodforbridgessubjectedtofierceearthquakeisintroduce