一座330m简支梁桥梁.doc

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1、大学毕业设计土木工程学院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分析结果来进行验算。横向分布系数通过桥梁博士3.0计

2、算完成。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，并满足现行规的要求。关键词：桥梁；荷载组合；力；验算；承载能力AbstractTheobjectinthisgraduationprojectisasimplysupportedthree-spangirde

3、rbridge(3×30m)inNewZoneofChangshouNorthandstraddlesTaohuaStream.Thebridgeisstraightontheplanewith100metresinlengthand32metersinwidth.ThebridgeisapartofahighwaywhichthedesignloadisHighway-I-level.Themainbeamismadeupof14T-beamsthatare2.0mhighandtheadjacentbeamsarelinkedbypouringwetjointwith60cminwi

4、dthbetweenthetwobeams.Substructureismadeupofcircularsectionpierswithadiameterof1.5andcircularsectionboredpouringpilefoundationwithadiameterof1.8m,thepilingsoffoundationareembeddedintotheintackmoderatelydifferentiatedrockwithadepthof5.4m.Theconcretegravityabutmentis6.5mhighwithatypeofUandsupported

5、bypilefoundation.AnalysisofsuperstructureinthebridgebedonebyusingMidasCivilTrial2006.SimplysupportedsingleT-beamisusedasanalysismodelintheprogram,onlyoneedgebeamisanalysedandthemidbeamusingthesameresultinanalyzingonsafeside.TransversedistributingcoefficientcanbeexportedbyusingDrbridge3.0.Thecalcu

6、lationsincludebendingmomentdiagram,shearforcediagramandmaximumstressunderbasic/long-term/short-termloadcombination.Accordingtothecalculations,checkingofcapacityandperformanceofnormaluseofthebeamhavebeendone.Checkingofcapacity/crackwidth/shearstrengthofbentcap,capacity/crackwidthofpiersandpilesare

7、donebyDrbridge3.0.Accordingtothecalculationresults,thebridgedesignedinthisgraduationprojectwassafe,economicalandreasonable,anditisqualifiedforthepresentbridgedesignspecifications.Keywords:Bridge;Loadcombination;InnerFo