解析不同产品申请ASTM E119耐火测试有什么异同之处

解析不同产品申请耐火测试有什么异同之处ASTM E119美标标准是对各种建筑结构件进行耐火性能判定，不同的产品，不同的用途，判定ASTM E119依据有相同点，也有不同点＞相同点基本指标相同基本指标包括完整性，隔热性耐火完整性•在标准耐火试验条件下，建筑分隔构件当某一面受火时，能在一定时间内防止火焰和热气穿透或在背火面出现火焰的能力耐火隔热性•在标准耐火试验条件下，建筑分隔构件当某一面受火时，能在一定时间内其背火面温度不超过规定值的能力不管是什么结构件都需要从完整性和隔热性能等基本方面进行评估例如无论是防火门、防火墙，天花板还是其他建筑构件，在试验中都要考察是否出现穿透性裂缝等影响完整性的现象，都要测量背火面温度来判断隔热性＞不同点具体指标数值•不同产品的具体判定指标数值会有差异例如不同类型的防火门，根据其使用场景和防火要求的不同，在完整性、隔热性方面的具体温度限值和时间要求会有所差异一般建筑用的甲级防火门要求耐火极限达到小时，在这小时

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51.5内背火面的温度升高值等指标要符合相应的严格规定；而一些特殊场所使用的防火门，可能耐火极限要求更高，相关指标也会更严格测试条件差异•不同产品在试验时的加载方式、加热条件等可能会根据产品特点有所调整例如对于墙体试件和楼板试件，加载方式就会不同，墙体可能主要考虑水平方向的推力和压力,而楼板主要考虑垂直方向的均布荷载止匕外，一些特殊产品可能需要在标准加热条件的基础上进行适当修改，以更准确地模拟其在实际火灾中的工况合格判定的侧重点•不同产品由于其在建筑中的功能不同，合格判定的侧重点也有所不同例如防火卷帘的判定可能更侧重于完整性和快速响应性能，在火灾发生时能够迅速下落并阻止火势蔓延；而对于一些隔热材料，隔热性则是最为关键的判定因素，其结构稳定性的要求相对较低＞判定依据失去完整性当棉垫被点燃或者背火面燃烧达秒钟以上时，被认为试件失去完整性；10测试过程中，直径的探棒可穿过裂缝进入炉内且探棒可沿裂缝长度方向不小于；直6mm150mm径的探棒可穿过裂缝进入炉内时，则被认为试件失去完整性25mm失去隔热性•试件背火面的平均温升超过试件表面初始平均温度℃或者背火面在任何一点的温升超过该140点初始温度时，则被认为试件失去隔热性180失去承重性•在试验过程中试件发生垮塌；或梁板构件的最大挠度、柱构件的轴向变形、柱构件的轴向变形速率超过规定值时，则被认为试件失去承重性Analysis of the similaritiesand differencesbetween different products inapplying forASTME119fire resistancetestThe Americanstandard ASTME119is usedto determinethe fire resistance performanceofvarious buildingstructures.Different productsand differentuses havesimilarities anddifferencesin thebasis fordetermination.Similarities:Basic indicatorsare thesame:Basic indicatorsinclude integrity and thermal insulation.Fire resistanceintegrity:Under standardfire resistancetest conditions,the abilityof buildingpartition componentstoprevent flamesand hotair frompenetrating orflames fromappearing onthe back-fire sidefor acertainperiod oftime whenone sideis exposedto fire.Fire resistancethermal insulation:Under standardfireresistancetest conditions,the abilityof buildingpartition componentstoprevent the back-fire sidetemperature fromexceeding thespecified valuefor acertain periodoftime whenone sideis exposedto fire.No matterwhat kindof structuralcomponent it is,it needsto beevaluated frombasic aspectssuchas integrityand thermal insulation performance.For example:Whether itis a fire door,fire wall,ceiling orother buildingcomponent,itisnecessary toexaminewhether thereare penetratingcracks orother phenomenathat affectintegrity duringthe test,and the back-fire sidetemperature mustbe measuredto determinethe thermalinsulation.Differences:•Specific index values:The specificindexvaluesof differentproducts mayvary.For example:Different typesof fire doors havedifferent specifictemperature limitsand timerequirements intermsof integrityand thermal insulation,depending ontheir usagescenarios andfire protectionrequirements.The ClassA firedoors used in generalbuildings requireafireresistance limitof

1.5hours,and thetemperature risevalue of theback-fire surfacewithin

1.5hours mustmeetthe correspondingstrict regulations;while thefiredoorsusedinsome specialplaces mayhavehigher fireresistance requirementsand morestringent relatedindicators.Differences intest conditions:The loadingmethod andheating conditionsof differentproducts during thetestmay beadjustedaccording tothe characteristicsof theproducts.For example:For wallspecimens andfloor specimens,the loadingmethod willbe different.The wallmaymainly considerthe thrustand pressurein thehorizontal direction,while thefloor mainlyconsidersthe uniformlydistributed loadin thevertical direction.In addition,some specialproductsmay needto beappropriately modifiedbased onthe standardheating conditionstomore accuratelysimulate theirworking conditionsin actualfires.Emphasis ofqualification judgment:Due tothe differentfunctions ofdifferentproductsin buildings,the emphasisof qualificationjudgmentis alsodifferent.For example:The judgmentof fireproofroller shuttersmay focusmore onintegrityandrapid responseperformance,and beable tofall quicklyand preventthe spreadof firewhen afire occurs;whilefor somethermalinsulationmaterials,thermalinsulationis themost criticaljudgment factor,and therequirements forstructural stabilityare relativelylow.Judgment basis:•Loss ofintegrity:When thecotton padis ignitedor theback-fire surfaceburns formore than10seconds,thespecimen isconsidered tohave lostits integrity;During thetest,a6mm diameterprobe canpass throughthe crackinto thefurnace and theprobe canbe noless than150mm alongthe lengthof the crack;When a25mm diameterprobe canpass throughthecrackinto thefurnace,the specimenisconsidered tohave lostits integrity.Loss of thermalinsulation:When theaverage temperature rise of theback-fire surfaceofthe specimen exceeds the initialaveragetemperature ofthe specimensurface by1400or thetemperatureriseoftheback-firesurface atany pointexceedstheinitial temperatureofthepoint by180口,the specimenisconsidered tohave lostits thermalinsulation.Loss ofload-bearing capacity:When thespecimen collapsesduringthetest;or whenthe maximumdeflection ofthe beamandslab components,the axialdeformation ofthe column components,andtheaxialdeformation rateofthecolumncomponentsexceed thespecified values,thespecimenisconsidered tohave lostits load-bearing capacity.。