大跨度網(wǎng)殼結(jié)構(gòu)火災(zāi)升溫過(guò)程及結(jié)構(gòu)性能分析.pdf

1、天津大學(xué)碩士學(xué)位論文大跨度網(wǎng)殼結(jié)構(gòu)火災(zāi)升溫過(guò)程及結(jié)構(gòu)性能分析姓名：袁鐵柱申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：結(jié)構(gòu)工程指導(dǎo)教師：尹越20090501ABSTRACTAtpresent，researchesonbuildingfiresfocusonlyonindoorfiresLittleworkhasbeencarriedoutforfiresinlargespacebuildingsInthispaperlarge—spacebuildingfi

2、rewassimulatedwithsoftwareFDSandthefactorsaffectingtheairtemperaturerisewasstudiedThefailuremechanismofthelargespanlatticeshellunderlargefireWasthenanalyzedbyFEMFirstlyarealfiresceneoccurredinawarehousewassimulatedwithso

3、ftwareFDSandtheairtemperatureriseinthewarehouseduringthefirewasdeterminedThehighesttemperatureoftheairis230。CThetemperatureloadWas也enappliedasnodeloadtothelatticeshell，Whichistheroofstructureofthewarehouse，andFEManalysis

4、wasperformedItwasshownthatthefailuremembersobtainedbynumericalanalysisagreedverywellwithpracticalsituation，whichverifiedtheairtemperaturerisesimulationandtheFEManalysisSecondlythefactorsaffectingtheairtemperatureriseofla

5、rgespacebuildingsunderlargefirewasstudiedFourtypicalsceneswithdifferentfirelocationsandtwokindsofroofshapeswereconsideredThehighestairtemperaturesforthefourtypicalsceneswithaarchshapedroofwerecomparedThehighestairtempera

6、tureisuptO700。Cwhenthefirelocatedinthecomerofbuildingandisonly470。CwhenthefhlocatedinthecenterForthesituationofaflatrooftheairtemperaturevariationissimilarasthatforthearch—shapedroofbutwithlowerairtemperaturevalueFinally

7、temperatureloadcausedbylargefirewasappliedasnodeloadtOthelatticeshellstructureandnon—linearFEManalysiswasperformedVariationoftheelasticmodulusandyieldstrengthofsteelwithtemperatureriseWasconsideredSpecialtechniqueofeleme

8、ntkillingWasadoptedtemovethemembersfailedduetotensionorbucklingItwasfoundthatthefneresistancecapacityofthelatticeshellisdifferentwithdifferentfirelocationsFireresistantcapacityofthelatticeshellwithfirelocatedinthecentero