内嵌预应力螺旋肋钢丝加固混凝土梁变形特性研究

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1、第34卷第1O期铁道学报Vo1．34No．102012年1O月JOURNALOFTHECHINARAILWAYS0CIETYOctober2O12文章编号：1001—8360(2012)10—0097～06内嵌预应力螺旋肋钢丝加固混凝土梁变形特性研究丁亚红，张美香。，孙博，曾宪桃(L河南理工大学土木工程学院，河南焦作454003；2．新余学院建筑与规划学院，江西新余338000)摘要：针对原有加固方法的不足，提出内嵌预应力螺旋肋钢丝加固混凝土梁加固技术，分析这种加固梁的变形特点，并依据普通钢筋混凝土梁的变形原理和内嵌预应力螺旋肋钢丝加固混凝土梁的特点，推导内

2、嵌预应力螺旋肋钢丝加固梁不同受力阶段的刚度表达式，得到内嵌预应力螺旋肋钢丝加固梁的刚度计算公式。在考虑预加力产生反拱的前提下，计算加固梁不同受力阶段的变形量。对4根内嵌预应力螺旋肋钢丝加固混凝土梁进行了试验验证。结果表明：试验结果与计算结果吻合较好，内嵌预应力螺旋肋钢丝加固混凝土梁能有效延缓裂缝的发展，减小构件变形，提高构件刚度。研究结果为该加固方法在工程实际中的应用提供了理论依据。关键词：混凝土；预应力；内嵌加固；螺旋肋钢丝；变形中图分类号：U448．35文献标志码：Adoi：10．3969／j．issn．1001—8360．2012．10．016Rese

3、archonDeformationofReinforcedConcreteBeamEmbeddedwithPrestressedHelicalRibSteelWiresDINGYa—hong，ZHANGMei—xiang～，SUNBo，ZENGXian—tao(1．SchoolofCivilEngineering，HenanPolytechnicUniversity，Jiaozuo454003，China；2．SchoolofArchitectureandUrbanPlanning，XinyuUniversity，Xinyu338000，China)Abst

4、ract：Aimingatmakingupthedeficienciesoftheconventionalconcretereinforcementmethods，therein—forcementtechnologyadoptingprestressedhelicalribstee1wiresbondedinsawedgroovesintheconcretecoursewaspresented．ThedeformationcharacteristicsofSOreinforcedconcretebeamswereanalyzed．Onthebasisofs

5、uchbeamdeformationcharacteristicsandthedeformationprincipleofordinaryreinforcedconcrete(RC)beams，thestiffnessexpressionsoftheRCbeamsembeddedwithprestressedhelicalribsteelwiresindifferentstress—ingstageswerederivedandthestiffnesscalculationformulasoftheRCbeamsembeddedwithprestressed

6、heli—calribsteelwireswereset．Underthepremisethatinvertedarchsweregeneratedinprestressing，themagni—tudesofdeformationoftheRCbeamsembeddedwithprestressedhelicalribsteelwiresindifferentstressingstageswerecalculated．TestsweremadewithfourRCbeamsembeddedwithprestressedhelicalribsteelwire

7、s．Thetestresultsandcalculationresultsshowgoodagreement．TheRCbeamembeddedwithprestressedhelicalribsteelwirescaneffectivelydelaydevelopmentofcracks，reducememberdeformationandstrengthenmemberstiffness．Theresearchresultslayatheoreticalbasisforapplicationofthenewreinforcementmethodineng

8、ineeringpractice．Keywords：