ZHANGQ，CHENT，LÜXZ．Mathematicalmodelingofbuildingintelligentevacuationsystem［J］．FireScienceandTechnology，2011，30(6):500－504.［19］刘世松，马鸿雁，焦宇阳．高层建筑火灾情况下人员疏散研究［J］．消防科学与技术，2019，38(6):794－798.LIUSS，MAHY，JIAOYY．Studyonpersonnelevacuationfromhigh-risebuildinginfire［J］．FireScienceandTechnology，2019，38(6):794－798.［20］HUＲLEYMJ．SFPEHandbookoffireprotectionengineering［M］．Berlin:Springer，2016.SimulationstudyonthelawoffiresmokepropagationunderthestackeffectZHANGYu-tao，CHEBo，ZHANGYu-jie(CollegeofSafetyScienceandEngineering，Xi＇anUniversityofScienceandTechnology，Xi＇an710054，China)Abstract:Inordertostudythelawofsmokepropagationcausedbystackeffectinhigh-risebuildings，thesmokespreadcharacteristicsoffourdifferentcross-sectiondimensions(CSD)ofverticalshaftinahigh-risebuildingwerecomparedandanalyzedbasedonFDS．Aspectratiooftheshaftwasintroducedtojudgewhetherthestackeffectphenomenonwasobviousornot．Thelawsofsmokelongitudinalspreadtimeandsmokevelocityinshaftwereobtained．Ashaftwithaspectratioof11.8isselectedtostudythegenerationcharacteristicsofthestackeffectanditsinfluenceonthedistributionofsmoke．Thetemperature，COvolumefractionandvisibilitychangesofthefloorsabovetheneutralplaneofthebuildingwereanalyzed．Simulationsillustratedthatinthecaseof8MWfireonthefirstfloorofthebuilding，whenaspectratioisaround8，thesmokevelocityintheshafthasasuddenchange，andthesmokevelocityinmostareasoftheshaftreaches6m/s，resultinginanobviousstackeffect;thesmokehazardsoffloorsabovetheneutralplanearemuchgreaterthanthosebelowtheneutralplaneunderstackeffect．Thehorizontalspreadspeedofsmokeabovethebuildingneutralplaneaccelerateswiththeincreaseoffloorheight．Asthefiresituationdevelops，thetemperatureoftheevacuationcorridorabovetheneutral-planeallexceedsthecriticaltemperatureofthesafeevacuationby60℃．Thefurtherawayfromthefire，thefastertheCOvolumefractionreachesthecriticalvalue．Thechangeofvisibilitydecreasessharply．Thetimetoreachthecritical...
