Chapter C Brickwork and Blockwork Impact and Explosion

《Chapter C Brickwork and Blockwork Impact and Explosion》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、CBrickworkandBlockwork:ImpactandExplosionC.1GeneralIntroductionGasexplosionsinbuildingsarearareoccurrence.Informationonboththecausesandeffectsofagasexplosionandsomepracticalguidanceonsafeventinghavealreadybeendiscussedinthistext.However,theimportanceofthestructure’s

2、abilitytowithstandtheblastloadcannotbeignored.Inthissection,abriefanalysisisgivenonimpactandexplosioninbrickworkconstruction.C.2Finite-ElementAnalysisofExplosionFigureC.1showsaseven-storeybuildingwith49compartments.Thecom-partmentshaveexternalwallsofthickness450mma

3、ndthethicknessoftheinternalwallsrangesbetween225and362.5mm.Thirteenventsareavail-ableincompartment/flatno32.Theinformationonatypical3-wallcubicle,showninFig.C.2,istakenfromflatno32,whereanexplosionduetoagasleakoccurs.AtypicalexternalwallofacubicleisshowninFig.C.3.Aga

4、sleakpressureisgeneratedincompartment/flatno32usingthefinite-elementschemegiveninFig.C.4.Apressureriseof75.84kNm−2wasgeneratedforarisetimeof0.2s;variousempiricalexpressionswereusedtocalculatethispres-sure.TableC.1liststhecomputerprogramusedtoevaluatesuchpressures.The

5、programislinkedtothefinite-elementISOPARprogramforthequickevaluationofpressures.Thefollowingdataformpartoftheinputforanexplosioninbrickbuildings:Aspectratioofheight/thickness:1.5,2.0,2.5,3.0Openings:1.5×4,0.4×0.4,1.0×2.3m−1Framestiffness,K:11.61,7.3,3.69kNmm976CBrick

6、workandBlockwork:ImpactandExplosionFig.C.1.Atypical7-storeybuildinginbrickworkBricksize:185.9×87.3×87.4mmYoung’smodulus,E:6.4670kNmm−2Poisson’sratio,v:0.096224.1×108×67.3mmYoung’smodulus,E:4.2323kNmm−2Poisson’sratio,v:0.141Numberof8-nodedisoparametricelements(mainb

7、uilding):900Numberof20-nodedisoparametricelements(wall):350Mortar(cement,lime,sand):1:1:6Young’smodulus,E:2.465kNmm−2Poisson’sratio,v:0.244Numberofgapand3-nodedelementsMainbuilding:1950Wall:350FigureC.5illustratesthepressurepulsesforfourtypesofexplosions.Thecorresp

8、ondingdeflectiontyperelationshipisgiveninFig.C.6.FigureC.7showsthedeflectionsforvariouspressuresagainstthedistanceoftheexplo-sion,andFig.C.8showsth