高墩大跨连续刚构桥地震反应分析

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1、西南交通大学硕士学位论文高墩大跨连续刚构桥地震反应分析姓名：胡步毛申请学位级别：硕士专业：桥梁与隧道工程指导教师：魏建东20080501西南交通大学硕士研究生学位论文第lI页AbstractWi也thedevelopmentoftransportation，continuousrigid—framedbridgeswereextendedandappliedinbridgeengineering．Thesebridges剐孵lifelineengineering，oncedestroyed，itwill嘶nggreateconomiclosses．It

2、isnecessarytomakeananalysistotheseismicresponseofcontinuousrigid-framedbridges．Inthisthesis，takingYujiangbridgeastheresearchobject，basedonthebasictheoryoftheseismicresponseanalysis，twomethodsincludingresponsespectrumandtime-historyanalysisofearthquakeareappliedtoacontinuousrigid

3、—framedbridge．Themaincontentinthisthesisincludes：1．Establishingfourcalculationmodelsofthebridge；consideringtheinfluenceofthepile—soilinteractionanddifferentsubstructure；analyzingthedynamiccharacteristicsofthefourmodelsrespectively．2．Theseismicresponseofthefourmodelswereanalyzedb

4、yresponsespectrumanddynamictime-historyanalysismethods．Bychangingthespeedoftheearthquakewave，thetraveling-waveeffectwereanalyzed．3．Theinfluencesoftheverticalseismiceffect，pile—soilinteractionandtraveling—waveeffectofearthquakewavewerediscussed．Theresultsofseismicresponsebetweent

5、hesinglethin—wallpiersmodelandthedoublethin-wallpiersmodelwerecompared．111emainconclusionsfromaboveinclude：(1)Settingdoublethin-wallpierschangesthesequenceofthevibrationmodeofthebridge，reducesthenaRffalfrequencyofthebridge，decreasestheshearandmomentofthebridgeandincreasestheaxia

6、lforceofthepiers．(2)Thepile-soilinteractionreducesthenaturalfrequencyandincreasesthedisplacementresponseofthebridge．(3)Comparedwiththeresultsofseismicresponseobtainedbyresponsespectrum，theresultsobtainedbytime—historyanalysismethodincreasesordecreases，weshouldadoptthelargerresul

7、twhendesign．(4)Theinternalforceandthedisplacementofthebridgeincreasesordecreases谢tIlthedifferenceofthespeedoftheearthquakewave，weshouldchoice。西南交通大学硕士研究生学位论文第1lI页thecorrespondingspeedoftheearthquakewaveaccordingtotheactualgroundsoilwhendesign．Itisexpectedtogivesomereferencesforp

8、racticalseismicdesignofsimilarbridges．Keywords：