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Alternativesforbridgesurfacingswithorthotropicplateddeck:afatiguepointofview
9
RelativeStressRange
1,50
1,40
1,30
1,20
1,10
1,00
0,90
0,80
-5
0
5
10
15
20
25
30
35
40
Temperature(°C)
Fig.3.Variationofrelativestressrangeasafunctionoftemperatureforasphalt
Tomakethematerialmodelevenmoreaccurate,thecalculationsforthis
paperwereperformedusingabehaviorlawthatistemperaturedependent,to
allowthestudyoftheinfluenceoftheasphaltlayeratdifferenttemperatures.
Theinitialresults,asshowninFig.3,clearlypointatapositiveeffectforthe
asphaltlayer.Generalizing,asphaltclearlyallowsareductionofthestressrange
inthelongitudinalstiffenerconnection;howeverthesizeofthisreductionis
highlydependentontheasphalttemperature.Onlyatlowertemperaturescan
thisreductionbecalledsignificant.
3.FIELDTESTINGPROGRAM
3.1.TheAlbertChannelbridge
Duringthespringandsummermonthsof2004,anextensivenumberof
testswerecarriedoutatatiedarchbridgewithanorthotropicdeck.Thebridge,
whichisbeingbuiltasapartoftheHighSpeedRailwaylinkbetweenAntwerp
andtheNetherlands,crossestheAlbertChannel,oneofBelgium’smost
importantwaterways,alittlenorthofthecityofAntwerp.
Theorthotropicdeckismadeupofa15mmthickdeckplatewithawidth
of10mbetweenthemainsidebeams,longitudinallystiffenedby10trapezoidal
stiffenerspassingcontinuouslythrough1mhightransversecrossbeamswhich
aredistancedat3,9mfromeachother.Toreducethefatiguestressesatthe
longitudinalstiffenertocrossbeamintersection,largecopeholesarecutoutof
thecrossbeams.ThephotographinFig.4showsthetestbridgedaysbeforeits
installation,aswellasthecrossbeamsandtrapezoidalstiffenersofthe
orthotropicdeck.
