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NKKNo.179(2002.11)–104–NewTechnologiesonSteelStructuresforSocialInfrastructuresShigeruOgayaTakashiIshiiRyuichiKawamuraTakashiOkamotoKoojiYamadaNKKhasproducedeffectiveproductsandservicesinsteelstructuresdivisionsuchasbridges,coastalcivilworks,steelpipes,watergates,andsteelframesinresponsetothecurrentsocialdemands.Thispapersum-marizesthetrendsandneedsonimprovementofsocialcapitalsurroundingthedomainofsteelstructuresandreportsthenewtechnologiesandproductstorespondtoemergingneedsoftomorrow.1.2.8019282550t19392869t19551162t5280301964401963119731975401979–105–NKKNo.179(2002.11)5P5400t3P5600t2P16000t402134t19731981Photo1404m319284800t1946520t301965Photo2,L506020Fig.1Fig.1Hybridcaisson198713.1m5020L2Photo3Photo1SuezCanalBridgeinEgypt(2001)3-spancontinuouscable-stayedbridge(Totallength:730m,mainspanlength:404m)Photo2HattabaraDamselectivewaterintakefacilities(1994)TelescopiccylindergatetoselectwarmorcleanwaterNKKNo.179(2002.11)–106–1975A11900t19801319871408t11755t2560t19731935B291946782t19501186tPhoto4CAD/CAM40301/33.2211)Alex-Fraser2)2I223.1Fig.2400m180m0.453H22IA2B23.22m3m21/501.59mTable1400mPhoto3Seawallcaisson,Ukishima(2000)(Hybridcaissonwithaslitwall)Photo4RoppongiHillsHighriseBuilding(2002)NKKprovide18000tsteelframesforRoppongiHills–107–NKKNo.179(2002.11)Table1Propertiesofbridgesectionmodel3Fig.32I2PaXUXLFig.3Conceptofnewcountermeasure(1)2I(2)22I15%3.3Table2Fig.40.013m2ATable2PropertiesofanalyticalmodelShape2-edgeI-shapedgirderWidth22mMass23t/mMomentofInetia2400tm2Area1.05m2Vertical0.8m4Horizontal160m4Bending-Torsional85m6Out-Plane1120m4In-Plane68m4Torsional1521m4Out-Plane6m4U,11m4L*1)In-Plane5m4U,7m4LTorsional8m4U,15m4L(Remarks)*1)U:UpperMemberL:LowerMemberHorizontalMemberMassStiffnessGirderStiffnessOutlineTower(b)2-edgebox-shapedgirder(a)2-edgeI-shapedgirder1000PaXUXL285unit:mm250PropertyPrototypeassumedModel(Scale1:50)Width22.0m0.44mDepth2.0m0.04mMass25.23t/m16.05kg/ModelInertia1548tm2/m0.394kgm2/ModelDamping()0.020Bendingfreq.0.27Hz2.10HzTorsionalfreq.0.54Hz4.20HzFig.2Cable-stayedbridgeforinvestigation(d)GirderB(box-shaped)(b)Tower25000142500400000180000180000(a)GeneralView(c)GirderA(I-shaped)800220001700800010008000800800170020001000Stringer(h=500)200022000170080001000800080080017001000unit:mmNKKNo.179(2002.11)–108–16%Fig.4Conceptofstructuralcountermeasures3.422200600m0.45GirderAB2APa=80cm2BXU=30cmXL=45cmFig.5032I300m400m2600m600mFig.5Mainspanlengthvsflutteronsetwindvelocity4.24.13)4.1.12Fig.6Fig.6Crosssectionsoftestmodels19681170Gal3510GalFig.7(1)TowercableMiddlepierLsX(a)InstallationofmiddlePier(b)Towercablesystem(c)AddinghorizontalmemberHorizontalmemberatthetopofthetower350085025030075(unit:mm)4252503500850250300250020406080100120200300400500600Mainspan,mFlutteronsetvelocity,m/sBox-shaped(Improved)Box-shaped(Basic)I-shaped(Improved)I-shaped(Basic)HorizontalmemberStandardcriteriainJapan–109–NKKNo.179(2002.11)KeKcKe=/g(200Gal),Ke=1/3(/g)1/3(200Gal)(1)GalgGalKe/Kc11Fig.7Residualdisplacementatthetopofthecaisson4.1.2()1999Fig.8Fig.8Crosssectionofquaywall,Shin-Okitsu4.24)4.2.1Fig.9Fig.9Flowpatternofseawaterexchange4.2.2Fig.1010m20m11.9m24m1200mm4.35)4.3.1Fig.11Fig.11Slopingtopcaissonwithaslitwall13.0m4.3m6.0m-15.0m+3.5mH.W.L.+1.6L.W.L.0.0-16.0m4.0m30.0m1.01.21.41.61.80.00.51.01.52.02.53.03.54.00.04.58.913.417.922.426.831.335.8(cm)(mm)Disp.(Prototype)Disp.(Model)Ke/KcFig.10Crosssectionofabreakwaterhavingafunctionofseawaterexchange,MisakifishingportNKKNo.179(2002.11)–110–4.3.215mFig.1230%Fig.1310m4Fig.12Crosssectionsoftestmodels5.100m500m1215Fig.14Fig.15Fig.14Waterintrusionpreventionfacilitiesforsubways(1)261/3(2)Fig.13Calculatedresultsofcaissonweight(waterdepthh=15.0m,waveperiodT=10.0s,14.5s)Fig.15Radialgatetypewaterintrusionpreventionfacilities(a)Verticalcaissonwithaslitwall(b)Slopingtopcaissonwithaslitwall–111–NKKNo.179(2002.11)(3)2001Table332Table3Basicdesigncriteria6.2121506.1Table46)Fig.16Fig.17Table4Technologyrelatedtoinspection,estimation,repair,reinforcement,replacementofsteelstructures(Fig.16,17)SOxNOx(Fig.18,19)(Fig.20)850mm900mm220NKKNo.179(2002.11)–112–Fig.17Thermographyoffaceplatemeasured6.27)Fig.18Fig.19mmFig.19AnappearanceofthesystemFig.2011Fig.20FatiguesensorsFig.16PrincipleofdefectdetectionmethodbyusinganinfraredradiationthermometerHeatingunitInfraredcameraLargethermaldiffusionSmallthermaldiffusion(b)Damage(a)NotdamageHightemp.Lowtemp.Damage/NotdamageFaceplateFig.18Principleofmagneticstressmeasurementusingmagneticanisotropysensor(a)Notdamage(b)Damage–113–NKKNo.179(2002.11)6.3Fig.21OPMOptimizedPlanningforMaintenance20307.1).“”..Vol.38A,pp.1153–1160(1992).2)Irwin,P.A.“WindTunnelTestsofLongSpanBridge!”.FinalRep.12thCongressIABSE,pp.689–696(1984).3).“”..50,4(2002).4).“”..42,4(2000).5).“”.16(2000).6).“”.NKK.No.178(2002).7).“”.546.pp.314–315(1999).8).“”.,(2001).9).“”..pp.58–61(2001-8).Fig.21Developmentofmaintenance-solutionbusinessinNKK
本文标题:社会资本整备不可欠新技术
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