简介:基于数值分析方法对不同长度的FRP管-混凝土-钢管组合柱的正截面受压性能进行了分析.对影响该组合柱的长短柱界限长细比(简称界限长细比)的因素进行了参数分析,包括组合柱两端的偏心距比值、偏心距绝对值,截面空心率,钢管的径厚比、屈服强度,FRP管的径厚比、轴向-环向弹性模量比、环向断裂应变比,混凝土纯弯-轴压极限应变比,约束混凝土强度比,提出了可用于计算组合柱界限长细比的设计公式.与分析程序的结果相比,设计公式具有足够精度且趋于保守.
简介:Currently,thedesignpracticeofhighwaybridgesaroundtheworldaremovingtowardslimitstatesdesign,areliability-baseddesignprocedure.CanadianHighwayBridgeDesignCode(CHBDC)isthefirstdesigncodeentirelydevelopedbasedonlimitstatesdesignphilosophy,includingfoundationsandFRPcomponents.However,reliabilityofastructuredecreasesinserviceduetoenvironmentalattacksandmaterialdeteriorationsuchasfatigue,corrosionandmanyotherreasons.Therefore,thestructureshouldbeinspectedperiodically,andthereliabilityofthestructureshouldbeevaluatedaccordingtoitsageandfielddata.Ifitsreliabilityisreducedtoacertainlevel,arepairshouldbescheduledaswellassomepreventivemaintenancemeasuresshouldbeimplementedtopreventfurtherdeterioration.Recently,manyresearchworkshavebeenconductedtoinvestigatereliability-deteriorationmechanismsforeachtypeofinfrastructureanditscomponents,optimizetheinspectionandmaintenancestrategy,predictremainingservicelife,estimateitslifecyclecost.Thispaperisfocusedonthestudyofreliability-deteriorationmechanismsofslabonsteelgirderbridgesduetofatigueandcorrosionofsteelgirdersaswellascorrosionofreinforcementinthedeckslab.Exampleswillalsobegiventoillustratetheproposedlifecyclemanagementstrategyforcompositeslabonsteelgirderbridges.