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1、大跨度連續(xù)剛構橋論文:大跨度連續(xù)剛構橋預應力鋼束設計研究【中文摘要】目前,我國正在大規(guī)模建造大跨度預應力混凝土連續(xù)剛構橋,但隨著后期主梁下?lián)稀⑾淞毫芽p等問題的產(chǎn)生,大跨度連續(xù)剛構撟預應力鋼束設計也備受關注本文研究了大跨度連續(xù)剛構橋預應力鋼束設計的理論和方法,分別探討了大跨度連續(xù)剛構橋縱向預應力鋼束、橫向預應力鋼束、豎向預應力鋼束的配置方法和關鍵問題,并利用有限元計算分析軟件Midas/Civil實現(xiàn)了68m+120m+68m的大跨度預應力混凝土連續(xù)剛構橋的設計建模、計算和分析。論文主要在以下方面展
2、開工作:分析了連續(xù)鋼構橋縱向預應力直線式配束方案,指出了這種配束方案存在的問題,并對比分析了其他配束方案的合理性;針對連續(xù)剛構橋主梁下?lián)虾拖淞毫芽p問題,討論了預應力設計上的改進措施;分析論述了有限元計算分析軟件Midas/Civil建立大跨度預應力混凝土連續(xù)剛構橋的過程和方法,實現(xiàn)了整個大跨度連續(xù)剛構橋梁結構的設計、計算和分析,并得出了大跨度連續(xù)剛構橋預應力鋼束的布置形式和預應力鋼筋的材料用量,而且也說明了Midas/Civil程序在預應力鋼筋混凝土鐵路橋梁設計驗算中的應用。【英文摘要】Nowad
3、ays,thelong-spanprestressedconcretecontinuousrigidframebridgehasbeenbuildedonalargescaleinChina.However,duetotheproblemaboutthedowndeflectionandthecracksofboxgirder,theprestressingtendondesignofthelong-spancontinuousrigidframebrigehasalsobeenpayedmuch
4、attention.Thisthesishasstudiedthetheoryandmethodoftheprestressingtendondesignoflong-spancontinuousrigidfrmebridge,anddiscussedthedesignmethodandthekeyproblemsoflongitudinalprestressingtendons,transverseprestressingtendons,andverticalprestressingreinfo
5、rcement.ThenwiththehelpofthefiniteelementcalculationandanalysissoftwareMidas/Civil,thisthesishasalsorealizedthecalculationandanalysisofalong-spanprestressedconcretecontinuousrigidframebridgewhichhasthespanarrangementof68m+120m+68mbybuildingthecomputat
6、ionalmodel.Thisthesishasanalyzedthelongitudinalprestressingtendondesignmethodbythestraightlinestyleofthecontinuousrigidframebridge,pointedouttheproblemsofthiskindofmethod,andthencomparedandanalyzedtherationalityofothermethodfortheprestressingtendondes
7、ign.Totheproblemsofthedowndeflectionandtheboxgirder’scracksofthecontinuousrigidframebridge,thisthesishasdiscussedtheimprovementoftheprestressdesign.Finally,thisthesishasdiscussedtheprocessandmethodtobuildthecomputationalmodelbythefiniteelementcalculat
8、ionandanalysissoftwareMidas/Civilforthelong-spanprestressedconcretecontinuousrigidframebridge,realizedthedesign,calculationandanalysisofthetotalstructureoflong-spanprestressedconcretecontinuousrigidframebridge,andthenconcludedtheprestessingten