摘要
Toevaluatetheimportanceofthecanyontopographyeffectsonlargestructures,basedonarigidframebridgeacrossa137-m-deepand600-m-widecanyon,theseismicresponseofthecanyonsiteisanalyzedusingatwo-dimensionalfiniteelementmodelunderdifferentseismicSVwaveswiththeassumptionsofverticalincidenceandobliqueincidencetoobtainthegroundmotions,whichareusedastheexcitationinputonthepierfoundationsofthebridgewithimprovedlargemassmethod.Theresultsindicatethatcanyontopographyhassignificantinfluencesonthegroundmotionsintermsofincidentangle.Thepeakgroundaccelerationvaluesvarygreatlyfromthebottomofthecanyontotheuppercorners.UnderverticalincidentSVwaves,attheuppercornersofcanyonthepeakgroundaccelerationsgreatlyincrease;whereasthepeakgroundaccelerationsdiminishatthebottomcornersofcanyon.UnderobliqueincidentSVwaves,theshakingofthecanyonslopeperpendiculartotheincidencedirectionismuchmoreseverethanthatoftheoppositesideofcanyon.Andthegroundsurfacehasbeencharacterizedbylargerdeformationsinthecaseofobliqueincidentwaves.Itisalsoconcludedthatthelowpiersandframeofthecontinuousrigidframebridgearemoresensitivetothemulti-supportseismicexcitationsthantheflexiblehighpiers.Thecanyontopographyaswellastheobliqueincidenceofthewavesbringsthecontinuousrigidframebridgesevereresponses,whichshouldbetakenintoaccountinbridgedesign.
出版日期
2010年01月11日（中国期刊网平台首次上网日期，不代表论文的发表时间）
