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1、关于预应力混凝土连续梁桥中的若干问题Ingeneral,forthefulcrumnegativebendingmomentinthesidespanisbendingmomentandclosetotheprincipleofroughlytomakeaclothbeammorehastenisreasonable,simplestructure,sotheLI/L2二0.539、0.692isacommonboundary,thespanratioofmainspanrange,whentheLI/L20
2、.419orless,sidespanisweight,shouldbelongtotheirregularspecialprocessing;Most111/L2=0.540.58ismorereasonable,whichwillbepossibletosupportthebridgebysupportingthebridgeovertheendofthebridge・Second,thehighbeamMainspanboxgirdercrosssectioninthedepth-spanratioof
3、hOmaterial(1/46.2~1/86)L2,usuallyintheformofL2(1/54~1/60),inthedepth-spanratioofboxgirderroothlmaterial(1/15~1/20.6)L2,mostlyaroundL2(1/18).Currentlyintheworld,hadatendencytoreducethegirderdepth-spanratio,andRaftsundetbridgehasbeenbuiltinNorwaystolmabridge,
4、inthecrosssectionoflightweightconcreteisadopted,reduceweight,reducethegirderdepth-spanratio,itsspa.nhOmaterial1/86,1/85・1,L2,L2androotheightofhl=1/20.1,L2and1/20.6,respectivelyL2・Ingeneral,canbeusedtwiceparabolabeambottomhighcurve,buttendto1/4,1/8,L2,L2ands
5、labconcretestressstrain,andinthesectionnearthemaintensilestressmorenervous,also,therefore,canbetwicetheparabolaoftheparabolachangesfrom1.5to1.5powerofmorereasonable・Plainonnavigableriverinjiangsu,inordertomeettherequirementsofnavigableclearance,evenwhenthed
6、esignadoptinggreaterthan2parabolapowerseriessetbottomcurve,thatisworthverypayattentiontotheproblem,ithasbeenprovedthatmidspandeflectiongenerallylarger,easilyhappenedisbendingcrackandobliquecrack.Third,roofthicknessInthepast,theuseof28cmhastendedtobereducedt
7、o25cminrecentyears,whichisclearlyrelatedtothecaseofthecaseandconstructiontechniques・Fourth,floorthicknessUsuallyadopt32cm(cross),torootsthickenedgradually,afewbridgehasbegunthe28-25cm,thickcrossthanisoftentheL2(1/140、1/160),isalsousefulto1/200,L2.Norway，sst
8、olmabridgeandRaftsundetbridge,whichhaveamaximumthicknessof105cmand120cm,are1/286・7and1/248・3ofthespan,whichwillyieldsignificanteconomicbenefits・Five,thewebGenerally40~50cm,butshouldpayspecialattentiont
