路桥专业论文：桥梁设计论文 摘要：设计是根据设计任务书的要求和公路桥规的规定对胜利河桥进行方案比选和设计的对该桥的设计本着“安全、实用、经济、美观”的八字原则本设计提出三种不同的桥型方案进行比较和选择方案一为预应力混凝土连续梁桥方案二为梁拱组合体系桥方案三为悬索桥经由以上原则以及设计施工等诸多方面考虑后确定预应力混凝土连续梁桥为最终设计方案本预应力混凝土连续梁桥共分为三跨（30m50m30m）主跨50m边跨对称30m；主梁采用单箱单室预应力混凝土箱梁跨中梁高为1.5m支座处梁高为2.8m截面高度按二次抛物线形式变化；桥面净宽为721.5m；设计荷载为公路级在设计中运用了桥梁设计软件Midas建立桥梁模型并对桥梁恒载、活载及徐变内力进行分析计算得出预应力钢束的预估值最后对主梁的应力、变形等进行验算经分析比较及验算表明该设计计算方法正确内力分布合理符合设计任务的要求关键词桥梁设计;预应力混凝土;箱梁;变截面连续梁;Midas桥梁模型Abstract:ThedesignisbasedontherequirementsofthedesigntaskandHighwayBridgeRegulation.Thedesignofthebridgeiscarriedoutintheeightcharacterprincipleofsafety,pratically,economicallyandaesheticbyparingandchoosingthebestone.Thefirstprogramiscontinousprestressedconcretegriderbridge,thesecondonethebeambinationofarchbridge,andthethirdoneisthesuspensionbridge.Accdodingtotheaboveprinciplesandconstructionfactors,theprestressedconousbridgeischosentotheultimate.Thecontinousprestressedconcretegirderbridgeisdividedintothreeinters,(30m50m30m),withthemainspanof50m,and30msymmetryone.Prestressedconcreteboxgriderisusedasthemainbeam;thebeamdepthinthemidspanis1.5m,whileatthesupportbearingitis2.8m.Thesectionaldepthischangedintheformofparabolic.Thenetwidthofthedeckis72x1.5m,andthedesignloadisforthehighwayI.Inthedesign,thebridgedesignsoftwareMIDASisusedtogetthecalculationmodel.Byanalyzingandputingthedeadload,liveloadandinternalforce,theestimatedvalueoftheprestressedstrandisgot.Finally,checkingcalculationiscarriedouttothestressanddeformationofthemainbeam.Theresultsoftheanalysisandcheckingcalculationshowthatthedesigncalculationmethodiscorrect,andtheinternalforcedistributionisreasonabletothedesigntask.Keywords:bridgedesign;prestressedconcrete;boxgirder;nonuniformcontinuousbeam;MIDASbridgemodel目录设计原始资料.1第一章方案比选2第二章上部结构形式及尺寸拟定5一主跨径的拟定5二顺桥向梁的尺寸拟定5三横桥向的尺寸拟定5四桥面铺装6五本桥主要材料6第三章桥面板的计算8 摘要：设计是根据设计任务书的要求和公路桥规的规定对胜利河桥进行方案比选和设计的对该桥的设计本着“安全、实用、经济、美观”的八字原则本设计提出三种不同的桥型方案进行比较和选择方案一为预应力混凝土连续梁桥方案二为梁拱组合体系桥方案三为悬索桥经由以上原则以及设计施工等诸多方面考虑后确定预应力混凝土连续梁桥为最终设计方案本预应力混凝土连续梁桥共分为三跨（30m50m30m）主跨50m边跨对称30m；主梁采用单箱单室预应力混凝土箱梁跨中梁高为1.5m支座处梁高为2.8m截面高度按二次抛物线形式变化；桥面净宽为721.5m；设计荷载为公路级在设计中运用了桥梁设计软件Midas建立桥梁模型并对桥梁恒载、活载及徐变内力进行分析计算得出预应力钢束的预估值最后对主梁的应力、变形等进行验算经分析比较及验算表明该设计计算方法正确内力分布合理符合设计任务的要求关键词桥梁设计;预应力混凝土;箱梁;变截面连续梁;Midas桥梁模型Abstract:ThedesignisbasedontherequirementsofthedesigntaskandHighwayBridgeRegulation.Thedesignofthebridgeiscarriedoutintheeightcharacterprincipleofsafety,pratically,economicallyandaesheticbyparingandchoosingthebestone.Thefirstprogramiscontinousprestressedconcretegriderbridge,thesecondonethebeambinationofarchbridge,andthethirdoneisthesuspensionbridge.Accdodingtotheaboveprinciplesandconstructionfactors,theprestressedconousbridgeischosentotheultimate.Thecontinousprestressedconcretegirderbridgeisdividedintothreeinters,(30m50m30m),withthemainspanof50m,and30msymmetryone.Prestressedconcreteboxgriderisusedasthemainbeam;thebeamdepthinthemidspanis1.5m,whileatthesupportbearingitis2.8m.Thesectionaldepthischangedintheformofparabolic.Thenetwidthofthedeckis72x1.5m,andthedesignloadisforthehighwayI.Inthedesign,thebridgedesignsoftwareMIDASisusedtogetthecalculationmodel.Byanalyzingandputingthedeadload,liveloadandinternalforce,theestimatedvalueoftheprestressedstrandisgot.Finally,checkingcalculationiscarriedouttothestressanddeformationofthemainbeam.Theresultsoftheanalysisandcheckingcalculationshowthatthedesigncalculationmethodiscorrect,andtheinternalforcedistributionisreasonabletothedesigntask.Keywords:bridgedesign;prestressedconcrete;boxgirder;nonuniformcontinuousbeam;MIDASbridgemodel目录设计原始资料.1第一章方案比选2第二章上部结构形式及尺寸拟定5一主跨径的拟定5二顺桥向梁的尺寸拟定5三横桥向的尺寸拟定5四桥面铺装6五本桥主要材料6第三章桥面板的计算8