基于pushover分析的桥梁结构抗震评估方法的分析与应用

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1、ABSTRACTAsavitallifelineengineering，bridgeproject，oncedestroyedinthestrongearthquakes，therewillbegreatdifficultiesfortheemergencymanagementandbridgesrestoration．Sincetheperformancebasedseismicdesigntheorywasproposedduringtheearlyof1990’8，ithasbeenpaidmuchattention．Thisnewap

2、proachgivesaneconomicandrationalsolutionofearthquakeresistantstrctures．Itinvolveshowtodecidethenonlinearearthquakedemandinaconvenientandappropriateway．Thedynamictimehistoryanalysisisregardedasthemostrigorousone，whichcantracethecourseoffailureinstructures．Butitdoesn’tbeusedi

3、ndailyengineeringbroadlyinthattherearesomeinherentrestrictionsinit，suchas，thechoiceofearthquakewaves，hugecomputationeffort，etc．Soinalongperiodoftime，theresearchershavebeentryingtoseekaconvenientmethodforthesolvingofnonlinearearthquakedemand．Basedontheachievementofpreviousre

4、searches，thisdissertationfocusedonthepushoveranalysismethod，thecapacityspectrummethodandtheseismicdamageanalysis．Thepaperproposedseveralimprovedmethodsandverifiedthembysimulations．Thepaperalsodiscussedtheapplicationofpushoveranalysismethodontheseismicdamageperformancedesign

5、．Andanevaluationmethodofseismiccapacityofbridgestructuresisdevelopedbasedonthesimplifiedcapacitystectrummethod．Andtheeffectsofthehighermodesonresponseofhighpierbridgeindifferentearthquakelevelsanddifferentspacetypeswerediscussed．Themaincontentsofthisdissertationinclude：1．Th

6、ebasicprincipleandprocedureofpushoveranalysismethodwerestudied．Therecentapplicationsandthedevelopmentsofpushoveranalysiswereconciselyremarked．Severallevelloadingmethodsandappliedmethodsofpushoveranalysistothebridgeseismicperformanceevaluationanddesignweredicussedbyemphasis．

7、2．BasedonthesimplifiedN2methodandthesimplifiedcapacitystectrummethod，theimprovedmulti—modecapacitystectrummethodwasporposedinthispaper．Itwassuitablefortheirregularfirderbridgewithlongmaturalperiod．3．Seismicdamagemodelsarestudiedfrombothmemberlevelandsystemlevel．nTheprincipl

8、eisdiscussedfordeterminingthegradesofseismicdamageofstructures，andtherelationshipi