试析体外预应力悬索分载法加固混凝土梁的试验研究与理论分析

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1、武汉理工大学硕士学位论文体外预应力悬索分载法加固混凝土梁的试验研究与理论分析姓名：张迎霞申请学位级别：硕士专业：结构工程指导教师：王佶20050501武汉理工大学硕士学位论文摘要本文提出的体外预应力悬索分载加固法，引入了悬索桥梁的结构思想，是在传统体外预应力加固方法基础上的新的尝试。为考察该加固方法的可行性及具体的加固施工方法，本文对三根试验梁做了对比试验研究，并在此基础上做了进一步的理论计算分析。试验研究表明：体外预应力悬索分载加固法是～种积极主动的加固法，改善了新旧材料之间的应变滞后现象：加固完毕后，原梁裂缝基本闭合、挠度明显减小；加固后的组合结构抵抗变形能力显著增强，刚

2、度提高明显，其极限承载力提高幅度较大，加固效果明显。论文根据试验数据绘出了试验粱典型的特征曲线，并结合试验现象和特征曲线对加固梁的特性进行了分析。在试验分析的基础上。论文阐述了体外预应力悬索分载加固法的加固机理及加固后梁的二次受力特性，推导了体外预应力悬索应力增量与结构变形的关系式，并对加固梁的受力、变形和裂缝宽度进行了理论分析计算。最后。依据截面弯矩一曲率关系，对加固梁进行了非线性全过程分析关键词体外预应力加固简支梁应力增量弯矩一曲率武汉理工大学硕士学位论文AbstractThisthesisputsforwardanewextemal-prestressedstrengt

3、heningbeammethod，a删-p瞳啦鹤s。出国He_出鲥啦—Dadstrengtheningmethod，whichadoptsthestructureideaofcablebridge．Inordertosearchthefeasibilityandconcretestrengtheningconstructionmethodoftheabovestrengtheningmethod，threetestingbeamsweremadetodoexperimentalresearch．Besides，farthertheoreticanalysisandcalcul

4、ationwasmade．Theexperimentalresearchshowsthatthe懿虹mI申嗡魄离cd《糊州虹面培捌strengtheningmethodisapositivestrengtheningmethod，whichimprovesstraindifferencebetweennewstrengtheningmaterialandoldconcretebeam．Afterthetestingbeamswerestrengthened，thecracksinthemwercalmostcloseandbendingdeflectionobviouslyr

5、educed．Afterstrengthened，thecombinedstructuremadeupofconcretebeamandstrengtheningsystemputupthefollowingcharacteristic：theabilitytoresistdeformationdearlyimproved,thed西ditydistinctlyenhancedandtheutmostbearingcapacitystronglyincreased．Theexperimentresultsshowedthestrengtheningeffectbytheext

6、ernal—prestressed—cable-sharing—loadwasveryperfect．Thisthesisoffersthetypicalcharacteristiccurvesofthetesthagbeamsaccordingtoexperimentaldataandanalyzesthecharacteristicofstrcngthenedbeam．Atthebaseoftheexperimentalresearch，thisthesissetsforththestrengtheningmechanismoftheexternal-prestresse

7、d-cable-sharing-loadstrengtheningmethodandthesecondbearing—loadperformanceofstrengthenedbeam，deducestherelationbetweenstressincrementofexternalprestressedcableandstructuredeformationandcalculatesinternalforce，deformationandcrackwidthofstrerIgthenedbeam．M