基于現(xiàn)場(chǎng)測(cè)試的拱橋鋼管混凝土拱肋徐變效應(yīng)研究.pdf

1、北京工業(yè)大學(xué)碩士學(xué)位論文基于現(xiàn)場(chǎng)測(cè)試的拱橋鋼管混凝土拱肋徐變效應(yīng)研究姓名：謝勝濤申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：結(jié)構(gòu)工程指導(dǎo)教師：閆維明20070501ABSTRACTAsthescience、technologyandtrafficisrapidlydevelopinglongspanconcrete—filledsteeltubular(CFST)archbridgehasbeenusedanddevelopedrecentlybecaus

2、eithastheadvantagessuchashighstrength、bigstiffness、lightstructure、beautifulmodel、supercrossingabilityandsl怵constructionperiodMeanwhilewiththeconcretecreeptheoryandconstructiondevelopingrapidlypeoplebegintopaymuchattentio

3、ntotheproblemofCFSTcreep，anditismorecomplicatedthanthatofordinaryconcrete，becausethecoreconcreteofCFSTstructureisintheairtightenvironmentofthesteeltubulartheinfluencebyexternalenvironmentisrelativelyslightmeanwhile，thest

4、ressoftheconcreteisdecreasingandthatofthesteeltubularisenlargingduetotheredistributionofsectionstressbycreepFirstlyhavingcombinedfiniteelementanalysiswithCFSTarchconcretecreepexperimentsofcoustructionsitewegetresearchdat

5、athroughfiniteelementanalysiscomputationandsteeltubularstress—termofdifferentconditionsanddifferentcircumstancesintheconslxuetionsiteIproposetheconceptofbasicandinclusiveeffectfactorofcocretecreepandthenmakeuseofthisconc

6、epttoanalyzethedatagainedaimingatgivingthecalculationmodelofcreepcoefficientandcalculationmethodofconcretecreepwhicha∞mostsuitabletothecircumstancesstressmadworkingconditionofsteeltubulararchinsideSecondly，havingcombined

7、finiteelementanalysiswitllCFSTarchconcretecreepexperimentsofconstructionsiteinviewofeachkindofoperatingmodeandworkingconditionsIgain山einclusiveeffectfactorofCFSTanddrawbackthecreepeffectcoe麗cientbasedonthemethodthisartic

8、leproposedFinally，bycomparingthesteeltubularstresssurplusofdifferentsectionsalongthearchlineofairpipearchandCFSTarchandtheoneofthesamecrosssectionofdifferentpositionsweproposetheconceptofCFSTarchcreepinternalforcecalcula

9、tionenvelopeandprovidegoodconferenceforconsideringconcretecreepeffectwhendesigningCFSTarchbridgesandtheirrelatedconstructionsInaword，theseachievementsmaturethedesigntheoryandmethodsofCFSTtrUSSarchbridge，andprovidebenefic