欢迎来到天天文库
浏览记录
ID:52947348
大小:499.80 KB
页数:7页
时间:2020-04-02
《混凝土梁应变测试测点数量和布置方案研究_钱寅泉.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、桥梁建设2012年第42卷第4期(总第214期)BridgeConstruction,Vol.42,No.4,2012(TotallyNo.214)51文章编号:1003-4722(2012)04-0051-07混凝土梁应变测试测点数量和布置方案研究钱寅泉1,周正茂2,王素娟2,龚振球2(1.上海市城乡建设和交通委员会,上海200003;2.上海同豪土木工程咨询有限公司,上海200092)摘要:为研究能满足工程需要的混凝土梁应变测试测点数量和能达到最佳测试效果的测点布置方案,采用抽样分析理论,利用均值标准差与应变片数量及测点位置的关系,求得混凝土梁所需要的最少应变片数量,对推求混凝土
2、梁梁底应变、中性轴高度及梁顶应变等几种典型应用下的测点布置方案进行讨论,并结合相关试验的实测数据进行分析。分析结果表明:当允许相对误差为5%时,梁底应变测试需在腹板下方布置5个测点;腹板应变测试需布置5个测点;梁底、腹板应变同时测试需在腹板上布置6个测点。增加混凝土应变测点数量、测点远离中性轴并使测点重心与测试目标位置中心重合均可提高测试精度。关键词:混凝土梁;应变测试;测点;布置;方案;抽样分析;误差中图分类号:U446.1;TU317.2文献标志码:AStudyofMeasurementPointAmountandPlacementSchemesforStrainTestingo
3、fConcreteBeam1,ZHOUZheng-mao2,WANGSu-juan2,GONGZhen-qiu2QIANYin-quan(1.CommitteeofUrbanandRuralConstructionandTransport,ShanghaiCity,Shanghai200003,China;2.ShanghaiTonghaoCivilEngineeringConsultingCo.,Ltd.,Shanghai200092,China)Abstract:Tostudythemeasurementpointamountforstraintestingofconcreteb
4、eamthatcancaterfortheengineeringrequirementsandthemeasurementpointplacementschemesthatcanachievethebesttestingeffect,thesamplinganalysistheoryandrelationshipbetweentheaveragevaluestandarderrorsandthestraingaugeamountandmeasurementpointlocationswereem-ployedtoobtaintheminimumstraingaugeamountreq
5、uiredforthestraintestingofthebeam.Themeasurementpointplacementschemesforseveralkindsoftypicalapplicationofobtainingthestraininthebeambottomconcrete,theneutralaxisheightandthestraininthebeamtopcon-cretewerediscussedandwereanalyzedwithreferencetothemeasureddataoftherelevanttests.Theresultsofthean
6、alysisshowthatwhentheallowablerelativeerroris5%,forthestraintes-tingofthebeambottomconcrete,5measurementpointsshouldbeplacedonthelowerpartsofthewebs;forthestraintestingofthewebconcrete,5measurementpointsshouldbeplacedandforthesimultaneousstraintestingofthebeambottomandwebconcrete,6measurementpo
7、intsshouldbeplacedonthewebs.Theincreaseofthemeasurementpointamountforthestraintes-tingoftheconcretebeam,theplacementofthemeasurementpointsfarfromtheneutralaxisandthecoincidingofthegravitycentersofthemeasurementpointswiththelocatio
此文档下载收益归作者所有