简介:Theobjectiveofthisworkistoanalysefatiguereliabilityofdeckstructuressubjectedtocorrelatedcrackgrowth.Thestressintensityfactorsofthecorrelatedcracksareobtainedbyfiniteelementanalysisandbasedonwhichthegeometrycorrectionfunctionsarederived.TheMonteCarlosimulationsareappliedtopredictthestatisticaldescriptorsofcorrelatedcracksbasedontheParis-Erdoganequation.Aprobabilisticmodelofcrackgrowthasafunctionoftimeisusedtoanalysethefatiguereliabilityofdeckstructuresaccountingforthecrackpropagationcorrelation.Adeckstructureismodelledasaseriessystemofstiffenedpanels,whereastiffenedpanelisregardedasaparallelsystemcomposedofplatesandarelongitudinal.Ithasbeenproventhatthemethoddevelopedherecanbeconvenientlyappliedtoperformthefatiguereliabilityassessmentofstructuressubjectedtocorrelatedcrackgrowth.
简介:1工程概况北京地铁15号线顺义站—石门站区间为盾构隧道.线路从顺义站引出沿府前西街向西至石门站,区间左线以85.5°、右线以87.9°斜度向下分别穿越京承铁路框架桥(埋深约14m),平面为直线,竖曲线为5.7‰的下坡.下穿京承铁路框架桥距离约44m.根据地质勘察报告,顺义站—石门站区间地层自上而下依次为:①1杂填土、②1粉质黏土、②3细中砂、⑥粉质黏土、⑦2粉西砂.区间线路赋存3层地下水,地下水类型分为上层滞水(一)、潜水(二)和层间水(三).上层滞水(一)水头埋深2.1~6.5m,含水层为粉质黏土②1层;潜水(二)水头埋深11.5~19.5m,含水层为细中砂②3;层间水(三)水头埋深23.5~27.0m,含水层为粉细砂⑦2层.盾构主要穿越地层为②1粉质黏土层和②3细中砂层,位于上层滞水(一)和潜水层(二)之间.