鋼構(gòu)件和鋼框架火災(zāi)行為的數(shù)值分析.pdf

1、合肥工業(yè)大學(xué)碩士學(xué)位論文鋼構(gòu)件和鋼框架火災(zāi)行為的數(shù)值分析姓名：任學(xué)軍申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：工程力學(xué)指導(dǎo)教師：何沛祥20071101AbstractThesteelstructuresarewidelyusedinmodembuildingstructuresduetoitsadvantagepropertiessuchashighstrength，lightwei曲tandsoonHowever，thepoorfire—resista

2、ntabilityisalsotheweaknessofthesteelstructures，inwhichitsyieldstrength，whenthetemperatureisupto4000C，woulddecreasethehalfoftheyieldstrengthatthenormaltemperature，andthesteelwilllostmostofitsstrengthandrigiditywhenthetemp

3、eratureupto6000CTherefore，itisveryimportantinthetheoryandpracticetostudytheproblemoffireresistanceandfireprotectionofthesteelstructuresHighrateheatingconditionisaseldombutverydangerouseventinfireAnonlinearfiniteelementan

4、alysis(FEA)methodofbasicsteelelementisintroducedbychoosingpropermaterialconstitutivemodelsforsteelbeamandpillarTodevelopadeepinsight，thispaperaimstoprovidetherealabilityofresistingfireofsteelframeunderpracticalfirecondit

5、ionAnadvancedthermalandmechanicalsimulationtechniquesisadoptedtoassesstheperformanceofframestructuresunderfireconditionswiththefiniteelementprogramANSYSThetransientheattransferiscalculated，whereasthewholeprocessresponseo

6、fsteelframeexposedtofireiscalculatedwithdoublenonlinearfiniteelementtechniqueTheresultsindicatethatthestructurefireresistantdesignmethodisbasedontheutilizationoftheinherentfireresistanceofsteelframes，andcapableofpredicti

7、ngthefireresistanceofsteelframesItalsosuggeststhatbaresteelbeamsusedwithsuitablefireresistantcolumnscouldresultinaglobalframehavingimprovedfireresistanceKeyword：nonlinear；high—rateheating；thermomechanicalcoupling；steelel