大桥20098莫台风强降水量逾桥涵水文作业.pptx

桥涵水文作业洪水对桥梁结构的破坏：Shuang-YuanBridge储天1150901

事故背景August2009TyphoonMorakotMorethan2,500mmofheavyprecipitation704peopledeadand18missingApproximatelyNT$110billionindamageDamagetoapproximately130highwaybridges

事故背景

破坏过程

破坏过程August9,2009A460-m-longbridgesectionwascompletelysweptawayinthemainchannelAround12:45a.m.,PiersP5–P16collapsed(StageIcollapse)PiersP2–P4weresubsequentlysweptawayat4:00a.m.(StageIIcollapse)

桥梁结构信息ConsistedoftwoparallelI-typeprestressedconcreteTheolderbridgeontheupstreamsidewasconstructedin1974.Thenewerbridgeonthedownstreamside,anidenticalstructuraltypetotheoldsection,wasbuiltin1981inabidtomodateincreasingtrafficflows

桥梁结构信息In2003,astructuralretrofitproject30piers,mostlylocatedinthemainchannel(PiersP5–P14)Toincreasethebearingcapacityofthefoundations,four0.9-m-diameterdrilledshaftswithalengthof50mextendeda4.3-m-widepilecaponeachpierperpendiculartotheflowdirection

水文信息

水文信息

水文信息

水文信息

灾害调查(a)brokenrightupstreamembankment(b)remnantofbridge(c)depositionofraftedwood(d)remnantsofPierP1andAbutmentA1(e)ground-penetratingradarinspectionaroundPierP14(f)remnantPiersP14andP16(g)driftingwoodraftedonPiersP39andP40(h)brokenrightupstreamembankment(i)damageatKaopingWeir(j)sonarinspectionovermainchannel(k)constructionoftemporarybridge(l)RIPinspectionalongupstreamsideofbridgesite

灾害调查resistivityimageprofiling(RIP)

灾害调查UpstreamRiver-CrossingStructuralDamageThedamageinvestigationcoveredtheupstreamriver-crossingstructuresuptotheLi-LingBridge(No.71).TheWan-DanWeir(No.20)andtheKaopingWeir(No.50)hadlosttheirreservoirfunctionsofirrigationanddrinkingwatersupplybecauseofhighlevelsofsedimentation

灾害调查HydrologicalChangeThewidthofthemainchannelhadbeenexpandedto1,200mThefloodplainshadbeenretrogradedfromPiersP4thr