分组集聚式斜拉桥索塔锚固区传力机制

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1、分组集聚式斜拉桥索塔锚固区传力机制王萌孙新阳李茜张强李法雄北京交通大学土木建筑工程学院交通运输部公路科学研宄院中铁大桥勘测设计院集团有限公司摘要：为研宄新型分组集聚式斜拉桥锚固形式应力安全及钢-混传剪机理，以某公路大桥为背景，选取分组集聚索塔锚固节段为分析对象，运用有限元软件ABAQUS建立锚岡区精细的数值模型.根据桥塔等效杆系模型的分析结果确定节段模型准确的荷载及边界条件，分别计算分析了3种工况下锚固区混凝土及钢横梁应力分布;通过对钢-混界面的各向应力及位移分布研宄，探讨在不同程度预应力损失和钢-混界面摩

2、擦系数影响下钢横梁与混凝土桥塔的传剪受力机理.研究结果表明：设计荷载工况下，钢横梁梁端剪力主要由界而静摩擦力承担，塔柱与钢横梁未发生相对滑动，具有足够安全储备；当锚杆预应力损失达到60%或接触面摩擦系数减小为0.2时，钢-混界面处于临界摩擦状态，相对滑移增大，结构处于相对不安全状态.关键词：斜拉桥;分组集聚;索塔锚冏区;剪力钉;等效杆系模型;作者简介：王萌(1985—)，女，博士，副教授作者简介：李茜,qian.li@rioh.cn收稿日期：2017-04-14基金:国家自然科学基金(51408031,51

3、778042)Mechanicalbehaviorforanchoragezoneofcable-stayedbridgewithgroupaggregationanchorsystemWANGMengSUNXinyangLIQianZHANGQiangLIFaxiongSchoolofCivilEngineering，BeijingJiaotongUniversity;ResearchInstituteofHighwayMinistryofTransport;ChinaZhongtieMajorBridg

4、eReconnaissance&DesignInstituteCo.，Ltd.;Abstract：Toanalyzethestresssafetyandshearforce-transferringmechanismbetweensteelandconcreteincable-stayedbridgewithgroupaggregationanchorsystem,whichisanewarchitectureofthecable-stayedbridge,afiniteelementmodelofanch

5、oragezonewasestablishedbyABAQUSsoftwarebasedonanactualbridgeproject.Thcloadingandboundaryconditionsofthesectionalmodelweredeterminedaccordingtotheequivalentbeamelementmodel.Thestressdistributionsoftheconcretepylonandsteelboxgirderunderthreeloadcaseswerestu

6、died.Accordingtotheanalysisofstressanddisplacementoftheinterfacebetweenconcretepylonandsteelboxgirder,theforce-transferringmechanicalperformanceswithdifferentlevelsofpre-tensionlossandfrictioncoefficientswereinvestigateddeeply.Theanalysisresultsshowthatthe

7、shearforceattheendofthesteelgirderismainlyundertakenbyfrictionindesignloadcase,indicatingthereisnorelativeslidingbetweentheconcretepylonandsteelboxgirderwithenoughsafetymargin.Whenthepre-tensionlossreaches60%orthefrictioncoefficientofinterfacereducestoO.2,

8、thecriticalfrictionstateisachievedandrelativeslidingisincreased,whichmakesthestructureunsafe.Keyword：cable-stayedbridge;groupaggregation;cable-pylonanchoragezone;shearstuds;equivalentbeamelementmodel;Received