桥梁下部结构设计——毕业设计

1建筑工程系道路桥梁工程技术专业毕业设计：钢筋混凝土简支梁桥下部结构设计（一）毕业设计原始资料1.道路等级：乡村道路；2.桥面横坡：设置1.5％的人字坡；3.横向布置：0.5m(防撞墙)+7.5m(车行道)+0.5m(防撞墙)，桥梁全宽8.5m.；4.设计荷载：公路-Ⅱ级；5.桥面铺装：12cm厚C40防水钢筋混凝土及涂HM1500防水剂；6.桥梁孔跨布置：本桥为上跨铁路而设，设3-20m预应力混凝土空心板梁，桥面连续;7.桥梁线形：本桥位于直线上，与铁路正交；8.地震基本烈度：8度。地质情况详见：桥梁工程地质纵断面图。（二）、毕业设计的任务与内容1.桥墩和基础的方案比选；2.盖梁设计；3.桥梁墩柱设计；4.基础（钻孔灌注桩）设计；5.施工组织设计；6.设计图纸：桥梁总体布置图、盖梁配筋图、桥墩构造图、桥墩配筋图、基础构造图、基础配筋图。2目录摘要······························································ⅠAbstract··························································Ⅱ前言······························································Ⅲ第一章设计资料与方案比选··········································11.1设计资料与方案必选·········································11.1.1设计标准及上部构造····································11.1.2水文地质条件·········································11.1.3材料·················································11.1.4下部结构比选··········································11.1.5桥梁下部构造尺寸······································3第二章盖梁计算····················································32.1荷载计算···················································32.1.1上部构造永久荷载表····································32.1.2盖梁自重及作用效应计算·······························42.1.3可变荷载计算·········································52.1.4双柱反力Gi的计算····································122.2内力计算··················································122.2.1恒载加活载作用下的各截面内力························122.2.2盖梁内力汇总表······································142.2.3盖梁各截面的配筋设计及承载力校核····················15第三章桥墩墩柱设计···············································173.1荷载计算··················································173.1.1恒载计算············································173.1.2活载计算············································173.1.3双柱反力横向分布计算································173.1.4荷载组合…··········································183.2截面配筋计算及应力验算····································193.2.1作用于墩柱顶的外力··································1933.2.3截面配筋计算········································20第四章钻孔灌注桩计算·············································224.1荷载计算··················································224.1.1每一根桩承受的荷载······································224.2桩长计算··················································244.3桩的内力计算··············································254.3.1桩的计算宽度b的确定································254.3.2桩的变形系数α······································254.3.3地面以下深度z处桩身截面上的弯矩Mz与水平压应力σzx的计算·················································254.3.4桩身截面配筋与承载力验算·····························274.3.5墩顶纵向水平位移验算·································29第五章施工组织设计···············································325.1施工内容··················································325.2施工方法及工艺·············································325.3劳动力、工期、设备投入计划·································355.4质量管理体系及保证措施·····································365.5安全文明保证措施··········································37谢词······························································40参考文献··························································414摘要本次设计的课题是混凝土简支梁桥下部结构，本设计选择部分混凝土简支梁桥为方案进行下部结构设计。桥梁下部结构考虑是否得当，对工程造价、质量、工期及使用影响很大。在设计中，首先根据地质条件选择适合本桥的桩基础，比较常用的桥墩形式，经过方案必选后选择合适的桥墩，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防撞墙荷载的作用，通过荷载集度进行盖梁内力的计算，然后是盖梁的配筋，经过盖梁内力计算对盖梁进行配筋及承载力校核；其次是桥墩的计算，桥墩的计算主要是桥墩所受的恒载、活载的的计算及双柱反力的计算，然后是配筋计算及应力验算；最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。关键词：简支梁桥；盖梁；桥墩；钻孔桩基础5AbstractThisdesignisthesubjectoftheMinistryofconcretebeamsunderthebridgestructure,partofthedesignchoicesfortheconcretebridgebeamsforthelowerpartoftheprogramdesign.Bridgesubstructuretoconsideritproperly,ontheprojectcost,quality,durationandtheuseofsignificantinfluence.Inthedesign,firstselecttheappropriategeologicalconditionsunderthebridgefoundation,themorecommonformofbridgepiersthroughtheprogramwillselecttheappropriatepieraftertheelection,fromtoptobottomandthenstarttoidentifytheprogram.First,coverthecalculationofbeam,cappingbeamfocusedoncomputinginthecourseofthesuperstructuredeadload,andthecapbeamweightloadofvehiclesandtheroleofanti-wall,throughtheloadsetcoverdegreeofinternalforcecalculation,thenthecapbeamreinforcementAftercalculationofthecapcoverSommerbeamreinforcementandcapacitycheck;followedbythecalculationofthepier,mainpierpiersufferedcalculateddeadload,liveloadofthecalculationandthecalculationofdouble-columnreaction,andthenisthereinforcementcalculationandstresscheck;Finally,thecalculationofboredpiles,pilelengthismainlythecalculationofallowablebearingcapacityofpilelengththeexperienceunderthepileformulatodeterminethelengthofthepile,pilesismainlyusedmthecalculationmethod,basedonmmethodtodeterminetheinternalforcespileandpilereinforcementdesignstrengthchecking.Keywords:simplysupportedbeambridge;capbeam;pier;boredpilefoundation6前言随着我国社会的发展与进步和人民生活水平的日益提高，交通的便利程度和安全性得到了人们的广泛关注，桥梁有事现代交通中不可缺少的组成部分，与此同时，桥梁建设得到了迅猛发展，我国桥梁工程无论在建设规模上，还是在科技水平上，均已跻身世界先进行列。各种功能齐全、造型美观的桥梁开始频繁的出现在人们的生活中，给人们带来方便的同时很多桥梁也逐渐成为城市的标志性建筑。本设计为混凝土简支梁桥下部结构设计，是根据《公路桥涵设计手册》系列丛书，以及依照交通部颁发的有关公路桥涵设计规范（JTG系列）拟定设计而成。在设计过程中，还参考了诸多如桥涵工程、土力学、