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时间:2019-02-04
《钢筋混凝土梁抗震可靠度影响因素》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、2014年5月沈阳建筑大学学报(自然科学版)May2014第30卷第3期JournalofShenyangJianzhuUniversity(NaturalScience)Vol.30,No.3文章编号:2095-1922(2014)03-0470-07doi:10.11717/j.issn:2095-1922.2014.03.13钢筋混凝土梁抗震可靠度影响因素肖诗云,刘金凤,董华行(大连理工大学建设工程学部,辽宁大连116024)摘要:目的研究钢筋混凝土梁抗震可靠度的影响因素,分析各因素对钢筋混
2、凝土梁抗震可靠度计算的影响规律,为钢筋混凝土梁设计和加固提供参考.方法采用考虑变量随机分布的JC验算点法,对钢筋混凝土梁的抗弯和抗剪可靠度进行计算,统计可靠度随各因素的变化规律.结果梁抗弯可靠度随配筋率和应变速率的增大而增大,随荷载比的增大而减小.梁抗剪可靠度随应变率和剪力增大系数的增加而增加,随配箍率和荷载比的增大而减小.钢筋混凝土梁抗弯可靠度和抗剪可靠度随几何尺寸(宽、高、保护层厚度,箍筋间距)的变化有微小变化或无变化.结论梁抗弯可靠度受配筋率、荷载比以及应变速率的影响较大,受几何尺寸的影响很
3、小;梁抗剪可靠度受配箍率、荷载比、应变速率及剪力增大系数取值的影响较大,不受几何尺寸的影响.关键词:JC验算点法;抗剪可靠度;抗弯可靠度;地震作用;应变率效应中图分类号:TU375文献标志码:ATheAnalysisofInfluencingFactorsintheAseismicReliabilityoftheReinforcedConcreteBeamXIAOShiyun,LIUJinfeng,DONGHuahang(FacultyofInfrastructureEngineering,Dal
4、ianUniversityofTechnology,Dalian,China,116024)Abstract:Thearticleresearchestheinfluencingfactorsinseismicreliabilityofreinforcedconcretebeamandanalyzestheinfluentialregularpatternoffactorsonthecalculationoftheseismicreliabilitytoproviderefer-enceforde
5、signandreinforcementofreinforcedconcretebeam.TheJCcheckingpointmethodconsideringthedistributionofvariablesisusedtoanalyzethebendingreliabilityandshearingreliabilityofthereinforcedconcretebeam.Studyshowsthatbendingreliabilityincreaseswiththeincreaseofr
6、einforcementratioandstrainrateanddecreaseswiththeincreaseofloadratio.Shearingreliabilityincreaseswiththeincreaseofstrainratesandtheamplifyingcoefficientofshearforceandincreaseswiththedecreaseofstirrupratioandloadratio.What’smore,thebendingreliabilitya
7、ndshearingreliabilityhavelittleornochangewiththechangeofthegeometry(width,height,thethicknessofprotectivelayer,stirrupspacing).Obviously,therein-forcementratio,loadratioandstrainratehavegreatinfluenceonthebendingreliabilityandthegeometryhaslittleinflu
8、enceonit.Inaddition,stirrupratio,loadratio,strainrateandtheamplifyingcoefficientofshearforcehavegreatinfluenceonshearingreliabilityandgeometryhaslittleinfluenceonit.Keywords:JCcheckingpoint;shearreliability;bendingreliability;seismicaction;str
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