體外預(yù)應(yīng)力鋼筋的極限應(yīng)力分析.pdf

1、北方交通大學(xué)碩士學(xué)位論文體外預(yù)應(yīng)力鋼筋的極限應(yīng)力分析姓名：李方志申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：橋梁與隧道工程指導(dǎo)教師：許克賓2000.2.1北方交通大學(xué)碩士學(xué)位論文StudyofthestressatultimateinexternaltendonsABSTRACTThisstudydealswiththesiressatultimate廠n。inextemaltendonsofexternallyprestressedconcretebea

2、msforthepurposeofcomputingtheirnominalbendingmomentresistanceThePaDerofferedsomebackgroundinformationfollowedbyacomprehensivereviewofexistingexperimentalandalmlyticalinvestigationsdealingwiththestressatultimatcinunbounde

3、dtendonsAndmanypredictionmethodsofdifferentresearchersandcodeswerecollectedthenarationalequationaccountsforthesecondordereffectswasdevelopedTheequationwasfoundagreewellwithsomeexperimentalresultsAnonlinearfiniteelementmo

4、delthatcouldbcusedtostudythebehavioruDtofailureofexternallyprestressedconcretebeamswasrepresentedhereAnditwasusedtostudythebehaviorofthenominalsimplysupportedrailwaybri心es，whichwereexternallyprestressedbystrandsAnewpredi

5、ctionequationt啦fpsatultimateisdevelopedbyregressionofthelargeamountofresultsTheequationisshowntoaccountformostofthevariablesfoundimportantintheanalysisofbeamsprestressedwithexternaltendonsTheyarethetendonarea，theratioofe

6、ffectivedepthtobeamdepth，theratiooftendonlengthtothebridgespan，thecompressivestrengthofconcreteandsoonTheeffectofeffectiveprestresstotheultimatetendonstresswasalsostudiedhereAdditiontothat，anotherkindofmatedalwasconsider