毕业设计（论文）-永定河斜拉桥设计

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1、永定河斜拉桥设计摘要斜拉桥作为一种桥面体系受压，支撑体系受拉的桥型因其外形挺拔、受力明确和施工工序简单受到越来越大的关注。不仅如此斜拉桥对于抗风和抗震稳定性都具有明显优势。对此，正致力于大力完善交通网络建设的发展中国家更迫切需要一些既能从外观上改善交通风貌，又能达到节约资金和人力的合适桥型，斜拉桥更是不二之选。本文以钢箱主梁斜拉桥为例，根据具体的实例完成从桥梁总体布置、主梁桥塔选型、拉索和锚固到主梁预应力体系和辅助墩的设计。对于斜拉桥这种高次超静定的结构体系采用结构有限元软件MIDASCIVIL计算。利用软件分析永久作用和可变作用。永久作用考虑体系自重恒载、铺装等二期恒载

2、、预应力荷载、混凝土收缩徐变和地基不均匀沉降。利用非线性施工阶段分析方法正装得到斜拉桥成桥状态。可变作用考虑车辆荷载人群荷载、温度作用、风荷载作用等。模型中的活载计算前要将车载按照规范计算出横向分布系数、多车道折减系数和跨径影响系数等。温度作用按梁塔及拉索整体升温考虑。风荷载按照规范在梁塔索分别施加横桥风荷载。利用恒活荷载承载极限状态下的两种组合校核主梁各个截面。荷载组合后的拉索力进行手工校核后满足安全系数2.5的规范要求。129最后对斜拉桥的行车道板和横隔梁进行局部应力验算和预应力、普通钢筋设计。关键词：预应力混凝土斜拉桥索力调整材料非线性结构静力电算129外文摘要De

3、signofaCable-stayedBridgeAbstractCable-stayedbridge,aspecialkindofbridgewhichhaspigeonholedbridgefloorsystemanddrawnsupportsystemisreceivingmoreandmoreloudconcernforitstallandstraightappearance,clearstructureandsimpleprocessofconstruction.Furthermorecable-stayedbridgeevenhasmoreadvantageo

4、verothersortsofbridgewhenitcomestothestabilityinwindandearthquake.Sincethiskindofbridgecoulddohelptoimprovetheimpressionofthetrafficsystemandlowerthecostofmoneyandlabor,cable-stayedbridgeissecondtononeforthedevelopingcountriesstrugglingtocompletetheirtrafficnets.Thisarticleisbasedonanexam

5、pleofsteeldeckcablestayedbridge.Theprocessofdesignincludeslayoutofbridge,maingirder,tower,cable,girderprestressingforcesystemandtheassistmound.SincethebridgeisahyperstaticstructurethestructuralfiniteelementsoftwareMIDASCIVILisutilizedforcalculation.Permanentandvariableactionsarecalculated

6、bysoftware.PermanentactionincludesSystempermanentgravity,thesecondstageofpermanentdecoratingetc.,prestressingforceload,concreteshrinkageandthesubsidyoffoundation.Spendtheanalyticalmethodofstageofnon-linearconstructioninstallingandgettingcable-stayedbridgeintothestateofthebridge.Variableac

7、tionincludesvehicleloads,crowds’loads,thetemperaturefunction,windloadfunctionetc.Two-dimensionalmodelneedscar-mountedtocalculateaccordingtonormhorizontaltodistributecoefficient,lanerollcoefficientofreducing129etc.Temperaturefunctionconsideraboutthewholebridge.Windlo