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1、學(xué)兔兔www.xuetutu.com橋梁建設(shè)2015年第45卷第1期(總第230期)114BridgeConstruction，Vo1．45，No．1，2015(TotallyNo．230)文章編號：1003—4722(2015)01—0114—06鋼管混凝土拱橋吊桿張拉方案比選韓保勤0(1．河北瑞志交通技術(shù)咨詢有限公司，河北石家莊050091；2．河北省道路結(jié)構(gòu)與材料工程技術(shù)研究中心，河北石家莊050091)摘要：邢汾高速公路沙河特大橋主橋為主跨146m的下承式鋼管混凝土拱橋，吊桿采用無應(yīng)力狀態(tài)法施工。為確定該橋吊桿張拉順序，保證張
2、拉過程安全，提出了4種吊桿張拉方案(①由兩端拱腳向拱頂對稱張拉；②由拱頂向兩端拱腳對稱張拉；③由1／4拱肋和3／4拱肋處向拱腳和跨中對稱張拉；④吊桿分3批張拉)，采用有限元分析軟件MIDASCivil建立全橋有限元模型進行仿真計算，分析4種方案的吊桿成橋拉力、拱肋位移、拱肋核心混凝土應(yīng)力、拱腳水平推力。結(jié)果表明，方案4的成橋拉力與設(shè)計成橋拉力最為接近，拱肋線性良好，拱肋截面處的混凝土壓應(yīng)力變化均勻，未出現(xiàn)較大的壓應(yīng)力，對拱腳水平推力影響較小。因此，選擇方案4施工，在實際施工中，橋梁無需二次調(diào)索，加快了施工進度，節(jié)約了施工成本。關(guān)鍵詞：
3、拱橋；鋼管拱；吊桿；拉力；有限元法；無應(yīng)力狀態(tài)法；方案比選中圖分類號：U448．22；U443．38文獻標志碼：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
