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1、第24卷第2期建筑科学与工程学报Vol.24No.22007年6月JournalofArchitectureandCivilEngineeringJune2007文章编号:167322049(2007)0220048206预应力混凝土连续梁的次内力分析方法1,21,331孔祥福,周绪红,于坤,狄谨(1.长安大学公路学院,陕西西安710064;2.山东省交通规划设计院,山东济南250031;3.湖南大学土木工程学院,湖南长沙410082)摘要:以连续梁为对象,研究了弹性阶段预应力布束形式对结构内力的影响。首先分析了预应力混凝土连续梁中预应力引起的
2、次内力产生的原因,然后把连续梁等效成边跨和中跨2种基本结构形式,将常见预应力束布设形式引起的固端约束次力矩和弯矩用参数表示,包括直线束、局部束、折线形预应力束以及抛物线形预应力束;同时,分析了折线束和抛物线束的梁端压力线与梁重心线的偏离距率及钢束几何形状的对应关系,总结了这2种布束形式对结构内力影响的特征;最后以一个三跨等截面连续梁为实例,对比折线束与抛物线束产生的次内力效应。结果表明,折线束对连续梁的次内力影响远大于抛物线束。该研究结果有助于工程技术人员优化预应力束筋设计。关键词:桥梁工程;预应力混凝土连续梁;预应力;布束形式;次内力中图分类
3、号:TU378.2文献标志码:AAnalysisMethodofSecondaryInternalForcesofPCContinuousBeam1,21,331KONGXiang2fu,ZHOUXu2hong,YUKun,DIJin(1.SchoolofHighway,ChangpanUniversity,Xipan710064,Shaanxi,China;2.ShandongProvincialCommunicationsPlanningandDesignInstitute,Jinan250031,Shandong,China;3.Scho
4、olofCivilEngineering,HunanUniversity,Changsha410082,Hunan,China)Abstract:Withtheprototypeofcontinuousbeam,authorsanalyzedthecharacteristicsofprestressimpactofdiversifiedarrangementsoftendonsinelasticitystage.Firstly,authorsstudiedthereasonsthatresultsinthesecondaryinternalfo
5、rcewerecausedbyprestressingforceinPCcontinuousbeam.Then,authorssimplifiedthecontinuousbridgetotwobasicstructuraltype,side2spanandmid2span,andprovidedthesecondarytorqueandbendingmomentatfixendexpressinginparametersforvariouscommonarrangementsoftendonincludingstraight2linetend
6、on,localtendon,polygonalprestresstendonandparabolaprestresstendon.Meanwhile,authorsanalyzedthecorrespondingrelationshipbetweenthedistancefrompressurelineatbeamendtogravitycenter,andthealignmentforpolygonalandparabolatendons,andsummarizedthecharacteristicsofprestressimpactofp
7、olygonaltendonandparabolatendon.Finally,takingathree2spancontinuousbeamasexample,authorscomparedtheeffectsofsecondaryinternalforcecausedbypolygonaltendonandparabolatendonrespectively.Theresultsshowthatpolygonaltendonaffectsthesecondaryinternalforcemorethanparabolatendons.The
8、researchoffersreferenceforengineerstooptimizethedesignofprestressingtendons
