钢管混凝土拱桥吊杆张拉方案比选

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1、学兔兔www.xuetutu.com桥梁建设2015年第45卷第1期(总第230期)114BridgeConstruction，Vo1．45，No．1，2015(TotallyNo．230)文章编号：1003—4722(2015)01—0114—06钢管混凝土拱桥吊杆张拉方案比选韩保勤0(1．河北瑞志交通技术咨询有限公司，河北石家庄050091；2．河北省道路结构与材料工程技术研究中心，河北石家庄050091)摘要：邢汾高速公路沙河特大桥主桥为主跨146m的下承式钢管混凝土拱桥，吊杆采用无应力状态法施工。为确定该桥吊杆张拉顺序，保证张

2、拉过程安全，提出了4种吊杆张拉方案(①由两端拱脚向拱顶对称张拉；②由拱顶向两端拱脚对称张拉；③由1／4拱肋和3／4拱肋处向拱脚和跨中对称张拉；④吊杆分3批张拉)，采用有限元分析软件MIDASCivil建立全桥有限元模型进行仿真计算，分析4种方案的吊杆成桥拉力、拱肋位移、拱肋核心混凝土应力、拱脚水平推力。结果表明，方案4的成桥拉力与设计成桥拉力最为接近，拱肋线性良好，拱肋截面处的混凝土压应力变化均匀，未出现较大的压应力，对拱脚水平推力影响较小。因此，选择方案4施工，在实际施工中，桥梁无需二次调索，加快了施工进度，节约了施工成本。关键词：

3、拱桥；钢管拱；吊杆；拉力；有限元法；无应力状态法；方案比选中图分类号：U448．22；U443．38文献标志码：AComparisonandSelectionofTensioningSchemeforHangersofConcrete。FilledSteelTubeArchBridgeHANBao—qin，(1．HebeiRuizhiTransportationTechnologyConsultingCo．，Ltd．，Shijiazhuang050091。China；2．HebeiProvincialResearchCenterofR

4、oadStructuresandMaterialEngineeringTechnologies，Shijiazhuang050091，China)Abstract：ThemainbridgeoftheShaheRiverBridgeonXingtai～FenyangExpresswayisacon～crete～filledsteeltubethrougharchbridgewithamainspanof146m．Thehangersofthebridgeweretobeconstructedbytheunstressedstateme

5、thod．TodeterminethetensioningsequencesandtOensurethesafetyofthetensioningprocessofthehangersintheconstruction，4typesofthehangertensioningschemeswereproposed，i．e．①thehangersweretObesymmetricallytensionedfromthearchspringsatbothendsofthebridgetowardsthearchcrown；②thehange

6、rstObesym～metricallytensionedfromthearchcrowntowardsthearchsprings；③thehangerstobesymmetri～callytensionedfromthe1／4or3／4archribstowardsthearchspringsandmidspanand④thehangerstObetensionedin3batches．ThesoftwareMIDASCivilwasusedtOsetupthefiniteele～mentmodelforthewholebridg

7、eofthebridge．thesimulationcalculationwasconductedandthetensileforcesofthehangers，displacementofthearchribs，coreconcretestressofthearchribsandhorizontalthrustofthearchspringsofthecompletedbridgeofthe4tensioningschemeswereanalyzed．Theresultsoftheanalysisshowthatforthesche

8、me4，thetensileforcesofthehangersofthecompletedbridgeareclosesttOthedesignedtensileforces，thegeometricshapesoft