大跨度懸索橋在非一致地震作用下的車—橋系統(tǒng)動(dòng)力分析.pdf

1、北京交通大學(xué)碩士學(xué)位論文大跨度懸索橋在非一致地震作用下的車橋系統(tǒng)動(dòng)力分析姓名：王小元申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：橋梁工程指導(dǎo)教師：張楠201206ABSTRACTABSTRACT：Earthquakeisakind“ofseriousnaturaldisasters，whichcausegreatdamagetohumanbeing，includingthesafetyoflifeandpropertysuchastheTangshanEa

2、rthquake，happenedin1976WiththedevelopmentofhighwaymoreandmorelongspansuspensionrailroadbridgeshavebuiltThus，theprobabilityofatrainrunningacrossabridgehasincreasedsignificantlywhichwouldcausederailmentduringtheearthquakeI

3、tcallsformoreattentiontOthesafetyofvehiclebridgesystemsunderseismicexcitationBystudyingtheresponseofvehicle—bridgesystemsunderseismicexcitation，wecantrvourbesttoavoidtheeventsoftrainderail】11ent111Before，wemostlyfocusont

4、hedynamicresponsesofbridgesubjectedtouniformseismicexcitationInthismethod，unidenticalaccelerationhistorieshavetobeincorporatedforallthebridgenodes，while，inpractice，thephaseanglesofseismicwavesdifferfordifferentfoundation

5、s，especiallyinthecaseoflong—spanbridgesSowehavetoconsiderthecaseofmulti—supportseismicexcitationInthisthesis，wemainlyconsiderthefollowingthreeaspectsinearthquakeanalysis：theincorporationofearthquakewave，thebridge’Snatura

6、lcharacteristics，andthedynamicresponsesofvehicle—bridgesystemundernon—uniformseismicexcitationOnthebasisofthestudyachievementsathomeandabroad，thecas—eofOujiangBridgewasstudiedInthecase，thedynamicresponsesweresimulatedfor

7、ahigh—speedtraintraversingtheOujiangsuspensionbridgewithdifferenttrainspeeds，andthetrainsafetywasevaluatedThestudyincludesthefollowingaspects：(1)Wecomparedtheadvantagesanddisadvantagesoftimehistoryapproach，randomvibratio

8、napproach121，theresponsespectrumapproachAndwestudiedtheresponsesofvehicle—bridgesystemsubjectedtomultisupportseismicexcitation(2)WebuiltthefinitemodelusingANSYSprogramandstudiedthebridge’Snaturaldynamicproperties(3)Byinp