橋梁風致響應的數(shù)值模擬

1、天津大學碩士學位論文橋梁風致響應的數(shù)值模擬姓名：石九州申請學位級別：碩士專業(yè)：橋梁與隧道工程指導教師：岳澄20070601ABSTRACTThedevelopmentofmodemmaterials，constructionsmethodsanddesigntheorieshasresultedinanewgenerationstructureSuchstructuresaremoreflexible，lighterweightandl

2、owdamping，theyaremoresusceptibletotheactionofwindInthepast20or30years，manykindsofnewbridgeswithspecialstylehavebeenbuiltinourcountryTherearemanynewchangesinthestructureofthesebridgesexceptfortheirspanbecomeslongerThesech

3、angesmakethewindeffectonthebridgemoreremarkableWindloadeffectsonthebridgehavebecometoOurattentionInpursuitofeconomicalsafedesigns，windloadcannotbeignoredanditisoneofmostimportantfactorsofdesignsForthebridgesarebecomingmo

4、revulnerabletothewind，itiSessentialtodeveloprealisticanalysisproceduresforpredictingtheirbehaviorunderaerodynamicexcitationFirstlyinthispapertheauthorhastriedtooutlinethebackgroundofanalysisofwindresistantandthebasalrese

5、archmethodsaboutwindresponseofbridgeThecharacteristicsofwindhavebeenstudiedindetailsinthispaperSimulationofwindloadhavebeenstudiedtooBasedonfiniteelementsoftware，anumericalsolutiontoinvestigatethedynamicalresponseofthebr

6、idgeunderturbulentwindexcitationisdevelopedSecondlythispaperpresentsageneraldiscussionofthebasicwindcharacteristics，includingthecompositionofwind，thecharacteristicsofwindvelocityprofileandthecharacteristicsofturbulentwin

7、dvelocityThen，basedonthespectraldensityfunction，simulatingthebasicwindbythelinearfiltrationmethod(ARmodel)andtheharmonysuperpositionmethodrespectivelybasedOiltheplatformofMatlabthemultipointwindvelocityhistoriesprogramar

8、edevelopedInordertoconfirmtheprogramisright，spectralanalysisisusedforthesimulatedresultThirdlybasedOilnumericalsimulationandbridgebeltsuppose，theplanermodelofbridgesectionisestablishedbycomputationalfluiddynamiomethod，ge

9、ttingthelawaboutcoefficientoftricomponentforcealongwiththechangeofangleofattackunderthewindactionBasedonthemodifiedDavenport’Sbufferingforceequation，turningthewindloadonthebridgeintotheloadoneachpointinthetime—domainSimu