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ID:360631
大小:1.01 MB
页数:54页
时间:2017-07-27
《一座3×30m简支梁桥设计 桥梁毕业设计论文》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、一座3×30m简支梁桥设计摘要本毕业设计的对象为一座3×30m简支梁桥,该桥位于长寿北部新区,跨越桃花溪。桥梁平面位于直线段上,全长100米,宽度32米,设计荷载为公路-I级。主梁横向由14片T梁组成,梁高均为2.0m,两片梁之间设置60cm宽现浇湿接缝。本桥采用桩柱式桥墩,直径1.5m的圆形截面墩柱及直径1.8m的圆形截面钻孔灌注桩,桩基础嵌入完整中风化基岩面5.4m以下;采用重力式U型桥台,桥台基础为直径1.5m的钻孔灌注桩基础。桥梁上部结构采用Midas程序进行分析计算,分析模型为单片简支T梁,仅分析一片边梁,中梁偏安全的采用边梁的
2、分析结果来进行验算。横向分布系数通过桥梁博士3.0计算完成。内力计算结果包括基本组合、长期组合及短期组合作用下的弯矩图、剪力图、最大应力图。根据内力计算结果,对主梁进行了承载能力及正常使用性能的验算。盖梁承载能力验算及裂缝宽度验算与抗剪验算、墩柱承载力验算及裂缝宽度验算、桩基承载力验算及裂缝宽度验算均由自编计算机程序计算完成,墩柱与桩基的水平位移及其它效应由桥梁博士3.0计算完成。根据验算结果得出结论:设计的桥梁结构是安全、经济、合理的,并满足现行规范的要求。关键词:桥梁;荷载组合;内力;验算;承载能力AbstractTheobjecti
3、nthisgraduationprojectisasimplysupportedthree-spangirderbridge(3×30m)inNewZoneofChangshouNorthandstraddlesTaohuaStream.Thebridgeisstraightontheplanewith100metresinlengthand32metersinwidth.ThebridgeisapartofahighwaywhichthedesignloadisHighway-I-level.Themainbeamismadeupof1
4、4T-beamsthatare2.0mhighandtheadjacentbeamsarelinkedbypouringwetjointwith60cminwidthbetweenthetwobeams.Substructureismadeupofcircularsectionpierswithadiameterof1.5andcircularsectionboredpouringpilefoundationwithadiameterof1.8m,thepilingsoffoundationareembeddedintotheintack
5、moderatelydifferentiatedrockwithadepthof5.4m.Theconcretegravityabutmentis6.5mhighwithatypeofUandsupportedbypilefoundation.AnalysisofsuperstructureinthebridgebedonebyusingMidasCivilTrial2006.SimplysupportedsingleT-beamisusedasanalysismodelintheprogram,onlyoneedgebeamisanal
6、ysedandthemidbeamusingthesameresultinanalyzingonsafeside.TransversedistributingcoefficientcanbeexportedbyusingDrbridge3.0.Thecalculationsincludebendingmomentdiagram,shearforcediagramandmaximumstressunderbasic/long-term/short-termloadcombination.Accordingtothecalculations,
7、checkingofcapacityandperformanceofnormaluseofthebeamhavebeendone.Checkingofcapacity/crackwidth/shearstrengthofbentcap,capacity/crackwidthofpiersandpilesaredonebyDrbridge3.0.Accordingtothecalculationresults,thebridgedesignedinthisgraduationprojectwassafe,economicalandreaso
8、nable,anditisqualifiedforthepresentbridgedesignspecifications.Keywords:Bridge;Loadcombination;In
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