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1、摘要…………………..立交桥…..设计摘要连续梁桥是工程上广泛使用的一种桥型,它不但具有可靠的强度,刚度及抗裂性,而且具有行车舒适平稳,养护工作量小,设计及施工经验成熟的特点。设计一座梁桥必须从桥跨布设,尺寸拟定,钢束布置以及施工方法等方面综合考虑,还要充分考虑设计参数和环境影响。本设计是一联五跨连续梁桥,截面形式为单箱双室,纵向变截面;施工方式是满堂支架整体现浇。该设计首先进行恒载、活载及次内力的计算,在此基础上进行荷载组合,绘制弯矩和剪力包络图;其次,根据短期效应组合配置预应力钢筋,并进行预应力损失的计算;最后,对该连续梁桥进行验算,是否满足设计要求。关键词:设
2、计连续梁桥满堂支架预应力31摘要Designfor………………………BridgeAbstractThecontinuousbeambridgeisakindofbridgetypeusedwidelyontheproject.Itnotonlyhasareliablestrength,stiffnessandcracking,butalsohasasmoothjourneycomfortable,conservationworkonthedesignandconstructionexperienceofthecharacteristicsofmaturity.Des
3、ignabridgemustbelaidacrossfromthebridge-laying,thesizeofthedevelopment,steelbeamlayoutandconstructionmethods,butalsogivefullconsiderationtothedesignparametersandenvironmentalimpact.Thisisadesignforafive-spancontinuousbridge,whosecross-sectionistwo-compartment,andchangingontheroaddirect
4、ion,constructedbypouringon-siteonfullframing.Thefirstdesignincludesconstantload,theliveloadandthecalculationoftheinternalforces.Onthebasisofaloadcombination,wecandrawmomentandshearenvelopemap.Next,accordingtotheshort-termeffectcombinationdispositionprestressedreinforcement,andcarrieson
5、thelossofprestressthecomputation.Finally,carriesonthecheckingcalculationtothiscontinuousbridge,whethertosatisfythedesignrequirements.KeyWords:design;continuousbridge;fullframing;prestress31目录目录摘要………………………………………………………………………………………………IAbstract……………………………………………………………………………………II第一章方案设计……………
6、………………………………………………………………11.1跨径布置………………………………………………………………………………11.2顺桥向设计……………………………………………………………………………11.3横桥向设计……………………………………………………………………………2第二章恒载计算……………………………………………………………………………62.1节段划分及截面几何要素计算…………………………………………………………62.2一期恒载计算…………………………………………………………………………92.3二期恒载计算………………………………………………………………
7、…………102.4总恒载效应……………………………………………………………………………11第三章活载计算……………………………………………………………………………143.1汽车荷载………………………………………………………………………………143.2最大、最小弯矩及其对应的剪力计算………………………………………………153.3最大、最小剪力及其对应的弯矩计算………………………………………………19第四章次内力计算…………………………………………………………………………254.1温度次内力计算………………………………………………………………………254.2支座沉降