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1、重慶交通學(xué)院碩士學(xué)位論文大跨徑斜拉橋的穩(wěn)定性分析與研究姓名:陳紅申請學(xué)位級別:碩士專業(yè):橋梁與隧道工程指導(dǎo)教師:顧安邦2003.3.1聒oa487摘要f\黼拉橋作為一種嗾梁、塔受壓、撤索受拯的綴合體系,奠粱、塔的穩(wěn)定。陵是裁拉褥跨經(jīng)不蟥發(fā)震戇關(guān)鍵翊題。隨蟄斜控橫跨經(jīng)的不叛增大,麟控捶的幾何a#線性秘材料非絨牲對穩(wěn)定性影響明顯增大,這艘不利因素導(dǎo)致斜拉婭的稔定問題更為突出。y零文溺透了勰楚轎瓣{}鶩掛疆逾及穩(wěn)定瓔諺,著翻瘸蠢雙元款黲(NASTR嬲和ANSYS)對兩座大跨度斜拉橋進行了詳細的穩(wěn)定分析,其主要內(nèi)容分為三部分:i.計算、分析,沈較了在圈種假定(
2、線彈往、僅考慮幾侮菲線往穗定、僅考慮孝毒料黲線牲、裴線毯)下結(jié)麴弱穩(wěn)定安全系數(shù),分輯了各類囂線瞧翊題對穩(wěn)定性的影響。2.討論了影響緒椅穩(wěn)窀性的因素,并計算、量化了材料彈性橫蹩、韌張力辯瓣楚撩穩(wěn)定性鶼影瞻。3。采用梁、板殼兩種不同的單元模式進行結(jié)構(gòu)計算,比較分年斤了兩種模式的特點,確定了兩種模式的適用范圍。遴過上述詩算勢凝,荑磷究裁栗鼴今愛瓣投耩的設(shè)詩、攘王、辯簪}等竅一定的參考價值。關(guān)鍵讖:籀拉≤穩(wěn)定淫,囂線經(jīng),穗定安基條≥,蠢≯毒,關(guān)鍵讖:籀拉轎,穩(wěn)定淫,囂線經(jīng),穗定安窿系數(shù),棗孵云母文ABSTRACTCable—stayedbriageisacom
3、positestructurewithcompressiongirders,compressiontowersandtensioncables,anditsgirdersandtowers’stabilityisthekeyfactortothespandevelopmentofcable—stayedbridge.Withtheincreaseofthespan,materialnonlinearityandgeometricnonlinearityofcable—stayedbriagealsohaveanincreasingeffect01"1i
4、tsstability,asaresult,thesedisadvantageousfactorsmakethestabilityanalysisofcable-stayedbridgeveryimportant.Thetheoriesofnonlinearityandstabilityofcable—stayedbridgearepresentedinthispaper.Theauthormakesadetailanalysisonthestabihtyofcable·stayedbridgesbymeansoffiniteelementprogra
5、ms(AnsysandNastran).Threemainanalyticpartsaleincludedinthispaperasfollowing:1.Theauthorcalculates,analyzesandcomparesthestmcture’ssafetycoefficientinfourcases(1inearity,geometricnonlinearityonly,materialnonlinearityonly,nonlinearity)andanalyzeshownonlinearfactoraffectstability.2
6、.Afewfactorswhichaffectthestructure’Sstabilityarediscussedandhowthematerial’Selasticmodulusaffectthestabilityofcable-stayedbridgeiscalculatedandquantified.3.Cable—stayedbriageiscalculatedbymeansofthegirder-elementmodelandtheplane—elementmodelrespectively.Aconclusiononhowtochoose
7、thereasonablemodelwillbedrawn.Aboveall,theresultsprovideapracticalreferencefordeNgn,constructionandscientificresearchofthelong-spancable—stayedbriage.KEYWORDS:cable—stayedbridge,stability,nonlinearity,safetycoefficientfiniteelement第一章緒論1.1引言“H朝橋梁結(jié)構(gòu)的穩(wěn)定性是關(guān)系安全與經(jīng)濟的主要問題之一,它與強度問題有同等重要
8、的意義。由于大跨徑橋梁目益廣泛采用高強材料和薄臂結(jié)構(gòu),其穩(wěn)定問題更為突出。同時在橋梁結(jié)構(gòu)的發(fā)展