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1、大跨度连续刚构桥论文：大跨度连续刚构桥预应力钢束设计研究【中文摘要】目前,我国正在大规模建造大跨度预应力混凝土连续刚构桥,但随着后期主梁下挠、箱梁裂缝等问题的产生,大跨度连续刚构挢预应力钢束设计也备受关注本文研究了大跨度连续刚构桥预应力钢束设计的理论和方法,分别探讨了大跨度连续刚构桥纵向预应力钢束、横向预应力钢束、竖向预应力钢束的配置方法和关键问题,并利用有限元计算分析软件Midas/Civil实现了68m+120m+68m的大跨度预应力混凝土连续刚构桥的设计建模、计算和分析。论文主要在以下方面展
2、开工作：分析了连续钢构桥纵向预应力直线式配束方案,指出了这种配束方案存在的问题,并对比分析了其他配束方案的合理性；针对连续刚构桥主梁下挠和箱梁裂缝问题,讨论了预应力设计上的改进措施；分析论述了有限元计算分析软件Midas/Civil建立大跨度预应力混凝土连续刚构桥的过程和方法,实现了整个大跨度连续刚构桥梁结构的设计、计算和分析,并得出了大跨度连续刚构桥预应力钢束的布置形式和预应力钢筋的材料用量,而且也说明了Midas/Civil程序在预应力钢筋混凝土铁路桥梁设计验算中的应用。【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
