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1、桥梁毕业设计—简支T形梁下部结构设计辽宁工程技术大学交通土建专业毕业设计双柱式桥墩VI摘要本次设计的课题是南水北调大桥下部结构,本设计选择部分预应力混凝土简支梁桥为方案进行下部结构设计。在设计中,首先根据地质条件选择适合本桥的桩基础,比较常用的桥墩(台)形式,经过方案必选后选择合适的桥梁墩(台),方案确定后再从上到下开始计算。首先是盖梁的计算,着重计算盖梁在使用过程中上部构造恒载、盖梁自重以及汽车及人群荷载的作用,通过荷载集度进行盖梁内力的计算,然后是盖梁的配筋,经过盖梁内力计算后对盖梁进行配筋及承载力校核;其次是桥墩的计算,
2、桥墩的计算主要是桥墩所受的恒载、活载的计算及双柱反力的计算,然后是配筋计算及应力验算;然后是钻孔灌注桩的计算,主要是桩长的计算,桩长根据单桩容许承载力的经验公式确定桩长,桩内力的计算主要是用m法,根据m法确定的桩的内力进行桩筋的设计及强度验算;最后是埋置式U型桥台刚性扩大基础的计算,主要是对桥台恒载、活载、土压力的计算,经过计算后,对计算结果进行地基承载力、基底偏心距、基础稳定性的验算。关键词:简支梁桥;盖梁;桥墩(台);钻孔灌注桩VIAbstractThedesignofthesubjectisthenanshuibeidi
3、aobridgestructurediversion,Iselectthepartiallyprestressedconcretebeambridgesolutionforthestructuredesign.Inthedesign,accordingtothegeologicalconditionsofthefirstchoiceforthisbridgepilefoundation,comparecommonpier(Abutment),afterschemewillbeselectedtochoosetheappropr
4、iatebridgepier(Abutment),planagainafterthestartcountingfromtoptobottom.Firstiscappingbeam,thecalculationusedinengineeringcalculationcappingbeamintheupperstructure,cappingbeamandcarandweightloadandloadaresetbytheinternalforcecalculation,cappingbeamisthencoverthebeams
5、,cappingbeamreinforcementthroughcalculationofcoverafterreinforcementandbearingcapacityofbeamsarechecked,Secondisthebridgepier,thecalculationofmainpierisconstant,liveloadcalculationandthetwinpillarsofcalculation,andtheniscalculatedandreinforcementstresscalculation,Th
6、enthecast-in-placepilelengthiscalculated,themainpilelengthcalculation,thebearingcapacityofsinglepileaccordingtoallowpilelength,experienceformulacalculationofinternalpilesismainlyusemmethod,accordingtothemethodofpilem.internalpilesofreinforcementdesignandstrengthcalc
7、ulation,Finallyisburiedtypeabutmentu-shapedrigidexpandthecalculation,ismainlybasedontheabutmentandliveload,soilpressurecalculation,throughcalculation,analysisandthebearingcapacityoffoundation,thestabilityofeccentricity.Keywords:simple-supported;Bridges;Cappingbeam;P
8、iers(Abutment);BoredpilesVI目录第一章绪论11.1概述11.2桥梁的发展概况11.3设计资料与方案比选21.3.1设计标准及上部构造21.3.2水文地质条件21.3.3材料31.3.4下部结构比选31.3.5桥梁下部结构尺寸4第二章盖梁计算72.1荷