盾构混凝土管片抗弯性能模拟试验研究.pdf

盾构混凝土管片抗弯性能模拟试验研究

朱阿祥;高培伟;徐少云;黄田子;张丽芳

【摘要】采用4根C50对称倾角钢筋混凝土梁受弯试件,模拟研究了盾构混凝土管

片受弯性能、破坏形态、裂缝形成规律及变形特点,并与现行规范中承载力和挠度

等计算结果进行了比较分析.结果表明:现行规范对对称倾角钢筋混凝土梁有较好的

适用性,对称倾角钢筋混凝土梁的受力破坏形式与普通适筋梁相似,受力阶段都包括

了弹性阶段、裂缝开展阶段和屈服阶段.对于不同配筋率的对称倾角钢筋混凝土梁,

配筋率为1.54％的梁比配筋率为1.13％的梁破坏时纯弯区裂缝的数量密集,而裂缝

的长度和宽度小.在受压钢筋不变,受拉筋的配筋率提升36％时试件的极限承载力提

升5.1％,试件达到极限承载力时的试件挠度提高了18.8％,说明在合理的范围内提

高对称倾角钢筋混凝土梁的配筋率可以提高梁的极限承载力和延性,从而提高结构

的安全性.对称倾角钢筋混凝土梁能较合理的模拟盾构混凝土管片抗弯性

能.%UsingfourC50symmetricalagleofreinforcedconcretebeambending

specimen,thesimulationresearchofshieldsegmentflexuralperformance

ofconcretecracks,failurepattern,formationruleanddeformation

characteristics,andwiththecurrentspecificationofbearingcapacityand

deflectioncalculationresulthascarriedonthecomparative

analysis,etc.Resultsshowthatthecurrentspecificationforsymmetryangle

ofthereinforcedconcretebeamhasbetterapplicability,thefailureformof

thereinforcedconcretebeamsymmetrictiltanglesimilartoordinary

optimalreinforcementbeam,twostagesincludingtheelasticstage,crack

developmentstageandtheyieldstage.Tothesymmetricalangleof

differentreinforcementratioofreinforcedconcretebeam,beam

proportionmeterreinforcementreinforcecementratioof1.54％to1.13％

ofthebeamdamagewhenthenumberofpurebendingareacrack,and

cracklengthandwidthofsmall.Incompressive

reinforcement,reinforcementratiooftensilesteelascendup36％36％

whentheultimatebearingcapacityofthespecimenandthespecimen

reachesultimatebearingcapacityofspecimendeflectionincreasedby

18.8％,improveinstructionswithinareasonablerangesymmetrictiltangle

ofreinforcedconcretebeamreinforcementratiocanimprovetheultimate

bearingcapacityandductilityofbeam,soastoimprovethesafetyofthe

structure.SymmetrictiltAngleofreinforcedconcretebeamcanbetter

simulatetheliningsegmentstress.

【期刊名称】《结构工程师》