毕业设计-土木工程-桥梁工程-设计摘要

兰州交通大学毕业设计（论文）摘要根据桥址处的具体情况，并结合设计要求，拟定出三个比选方案。分别是预应力混凝土连续梁桥、钢筋混凝土简支梁桥、钢筋混凝土连续刚构桥。根据安全、适用、经济、美观的原则确定预应力混凝土连续梁桥为推荐方案，桥梁总长136m（40m+56m+40m）。主梁采用单箱单室箱形截面。施工方法采用满堂支架施工法。使用midas6.71程序进行结构计算。计算结构的恒载内力，求得恒载内力下结构的弯矩图及剪力图；计算各控制截面内力影响线，并按最不利情况进行加载，求得活载作用下内力包络图。定义基础沉降组，按最不利组合求得基础沉降引起的内力。施加温度荷载，求得温度荷载下内力。并进行荷载组合，根据各控制截面内力进行了估束和配筋计算，并对梁体进行具体的钢束布置。最后，对各控制截面进行了强度、抗裂性、应力和变形验算。关键词：预应力混凝土；连续梁桥；荷载组合兰州交通大学毕业设计（论文）AbstractAccordingtothespecificsituationatthebridgesite,combinedwiththedesignrequirements,toworkoutmorethanthreealternatives.Arecontinuousprestressedconcretebeambridge,bridgeofreinforcedconcrebeamsreinforcedconcretecontinuousrigidframebridge.Accordingtosecurity,application,economic,aestheticprinciplesofprestressedconcretecontinuousbeambridgetodeterminetherecommendedprogramBridgelength131.1m(32.55m+48m+32.55m).Singleboxgirdersingle-cellboxsections.FullSupportConstructionMethodsConstructionLaw.Structurecalculationusingmidas6.71program.Calculatethestructuredeadloadinternalforces,internalforcesobtainedunderthestructuredeadloadbendingmomentdiagramandsheardiagram;calculatetheinternalforcecontrolsectionofline,accordingtothemostadverseconditionstoload,internalforcesobtainedunderliveloadenvelope.Thedefinitionoffoundatiosettlmentgroup,obtainedbythemostunfavorablecombinationofinternalforcescausedbyfoundationsettlement.Appliedthermalload,internalforcesobtainedundertemperatureloading.Andtheloadcombination,accordingtoSectionAnalysisofthecontrolbeamandreinforcementestimateswerecalculated,andaconcretebeamsteelbeamlayout.Finally,thecontrolsectionforthestrength,crackresistance,stressanddeformationchecking.Keywords:prestressedconcrete;continuousbeambridge;loadcombination