摘要锦州龙栖湾新区滨海桥位于辽西街、辽东街与滨海路交汇处，它的建成可以进一步拉动城市南扩，缓解新区现有桥梁交通的拥挤状况，解决其它桥梁过于拥挤和繁忙的现象，会给锦州的经济发展带来很大变化。本桥采用预应力混凝土箱型梁桥，桥长90米，三跨结构，跨径30米，桥宽16米，为双向四车道。设计中完成桥梁在恒载、活载等引起的结构内力和变形；并且分析了预应力箱梁桥在恒载和活载作用下的受力性能，对全桥进行预应力钢束的设计计算等。本设计采用的是装配式预应力混凝土箱型梁桥，这种桥可以减少施工时间，而且可以充分利用机器化，可以提高工作效率，而且质量也可以提高，由于是预应力，可以有效发挥材料的性能，充分利用资源，而且可以增加桥梁的有效跨径。而且易于就地取材，所用材料价格低，外形美观，施工方便。本设计严格遵守相关规范，以新出版的各种规范为基础，在老师的指导和帮助下，希望能顺利完成设计。关键词：箱型梁；预应力混凝土；三跨结构；预应力钢束；AbstractTheLongqiwanzoneofJinzhoulocatedinthecrossofLiaoxistreet,LiaodongstreetandBinhairoad.Itbuiltanewcitycanbefurtherboostthecitysouthward，Thisbridgecompletedwillsolvetheotherbridgebuiltovercrowdedandbusyphenomenon,andwillbringeconomicopportunitytoJinzhou.ThebridgeissimplysupportedbypriestessedconcreteBox-beam,whichis90meterslength,threespanstructure,andthesingle-holespan30meters,thebridgewidth16meterswidth,andforthebidirectionalfourtrafficlanes.Inthedesignofthebridge,wehavecompletedthefollowingwork,suchasbridgestructureendogenforceanddistortionwhichcausedbythedeadloadandtheliveloadfunction,andhaveanalyzedtheperformanceofthebridgewhenitisaffectedbythedeadloadandtheliveloadstress.Simultaneously，wecarryonthedesigncalculationwhichtotheentirebridgethepre-stressedsteelties.Designapproachoftheconstantload,completedinliveloadcausedinternalforceanddeformationofthestructure;Theprestressedslabbridgeandanalysisinconstantloadandundertheinfluenceofliveloadandthemechanicalpropertiesofprestressedsteel,theapproachtodesignandcalculationofthebeam.Thedesignaccordingtothecomprehensiveimplementationthepolicy,"theeconomy,suitable,artistic,andsafe",approachtothebasicfunctionrequestandtheusepremiserequests.Keywords:Box-beam;prestressedconcrete;threespanstructure;pre-stressedsteelties;目录第一章绪论...............................................11.1.设计技术指标...........................................1第二章方案比选...............................................42.1桥型方案..................................................42.2方案比选..................................................52.3方案确定..................................................6第三章上部结构...............................................73.1设计资料及构造布置........................................73.1.1设计资料............................................73.1.2箱型梁构造形式及相关参数设计........................73.2主梁内力计算.............................................103.2.1恒载内力计算（边主梁）.............................103.2.2活载内力计算.......................................123.2.3内力组合...........................................203.3预应力刚束的估算及布置...................................213.3.1跨中截面钢束的估算和确定...........................213.3.2预应力钢束布置.....................................213.4主梁截面几何特性.........................................263.4.1截面面积及惯矩计算.................................263.4.2截面静距计算.......................................303.4.3截面几何特性总表..........
