高拱坝闸墩u形预应力锚索受力不均匀性分析

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1、重庆大学硕士学位论文II英文摘要ABSTRACTIntheprocessofpullingtheU-shapedanchorropesentirely，andinthebendingsectionoftheanchorropes，therearecontactfrictionsbetweenthesteelstrands，inaddition，thesteelstrands’arrangementpositionsonthecrosssectionofanchorropeswouldchangewiththetension，toge

2、therwithinitialunevennessofstress，allthosefactorscancauseunevennessofstressinthesteelstrandsofananchorrope，eventhereisagreatdifferencebetweeneachother．Engineeringexperienceindicatesthatthisunevennesscanbereducedbysingletension，butit’sconstructionprocessistoocomplicated

3、，andit’sconstructionperiodislong，moreover，singletensionneedhighercost，sothatitisnotadvisabletogeneralizethismethod，thecommonlyusedmethodisstillpullingtheU-shapedanchorropesentirelyordoitaftersinglepreload．Unevennessofstressinthesteelstrandscausedbypullingentirelyleadsa

4、lotofobstaclestodesignandconstruction，itisagreatdifficultyinthecurrentqualitycontrolofU-shapedpre-stressedanchorropes．AndtheU-shapedpieranchorropeshavecharactersofmoresteelstrands，longerbendingsectionandlargerpullingforce，allthosecharacterswillworsenUnevennessofstressi

5、nthesteelstrands．ThisarticlepointsatthestressunevennessofU-shapedanchorropesinhigharchdam’spier，theresearchcontentsareasfollows：①AfterinvestigatingtheconstructionsiteandanalyzingcarefullytheconstructiontechnologyofU-shapedanchorropes，weputtedforwardatestingplanthatwoul

6、dbeusedtoteststressofsinglesteelstrandwhentheanchorropesarepulledentirely，andactualizedthefieldtestsuccessfully，obtainedtheforcedataofsinglesteelstrand．Wemanipulatedtheforcedataofsteelstrandsbytheanchorrope’sunevennesscoefficient，sowecananalyzethedegreeoftheunevennessa

7、ndit’sfeatures．②Thisarticlesummarizedvariousfactorsthatwouldpossiblycauseunevennessofstressinthesteelstrands，andanalyzedeachkindoffactorquantificationally．Withregardtothefactorofcontactfriction，wecalculatedoutthestressvalueofeachsteelstrand，withtheformulagivenbycriteri

8、onandtheclassicaltheoryoffrictionRelatedtothisproblem．③Aftercomparingtheresultofquantitativeanalysisandtheresultoftes