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装饰材料消防等级有哪几类？

装饰材料消防等级有哪几类？

浏览：41次 | 提问时间： 08-07 02:56

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用Style淡漠一切 08-07 02:56

火等级取决于局部所使用木饰面所占比例及此木饰面的防火等级。全部是轻钢龙骨纸面石膏板算*，如果木饰面比例小，且也达到B1级，也可算*；如果木饰面达B2级，总体可算B1级公用建筑* 住宅楼B1级

伴你不走 08-07 03:05

防火材料等级：　　A 级：不燃性建筑材料，几乎不发生燃烧的材料。　　A1级：不燃，不起明火　　A2级：不燃，要测量烟，要合格。　　B1级：难燃性建筑材料：难燃类材料有较好的阻燃作用。其在空气中遇明火或在高温作用下难起火，不易很快发生蔓延，且当火源移开后燃烧立即停止。　　B2级：可燃性建筑材料：可燃类材料有一定的阻燃作用。在空气中遇明火或在高温作用下会立即起火燃烧，易导致火灾的蔓延，如木柱、木屋架、木梁、木楼梯等。　　B3级：易燃性建筑材料，无任何阻燃效果，极易燃烧，火灾危险性很大。谢谢

骑士先森 08-07 03:13

一建筑耐火等级的划分1、建筑耐火等级的划分依据建筑耐火等级的划分是建筑防火技术措施中最基本的措施之一，中国的建筑设计规范把建筑物的耐火等级分为一、二、三、四级，一级最高，耐火能力最强；四级最低，耐火能力最弱。建筑物的耐火等级取决于组成该建筑物的建筑构件的燃烧性能和耐火极限。所谓建筑构件是指建筑物的墙体、基础、梁、柱、楼板、楼梯、吊顶等一系列基本组成构件。建筑构件的燃烧性能和耐火极限见表4-11）、建筑构件的燃烧性能是指由建筑构件的材料遇火反应，分为不燃烧体、难燃烧体和燃烧体三类，对建筑构件而言不燃烧体如墙柱、基础等；难燃烧体如吊架、吊顶及内部管道；燃烧体如门窗、吊顶、装饰材料等。2）、建筑构件的耐火极限：将任一建筑构件按时间—温度标准曲线进行耐火试验，从受到火的作用时起，到失去支持能力或完整性被破坏或失去隔火作用时为止的这段时间称为耐火极限，以小时“h”表示。时间-温度标准曲线是指按特定的加温方法，在标准的实验室条件下，所表示的现场火灾发展情况的一条理想化了的试验曲线。该曲线以被国际标准化组织采纳，目的是为了对建筑构件的极限耐火时间有一个统一的检验标准。我国采纳了国际标准ISO834的标准火灾升温曲线。该曲线公式为T-T0

幼稚 08-07 03:21

345lg(8t+1) 式中t为时间，以“min”计；T为当所用时间为t时，构件所承受的温度值，以“℃”计；T0为初始温度，以“℃” 计；计算时设*20℃。下图4-1是根据国际标准火灾升温曲线公式作出的温度-时间曲线，2、耐火极限的判定条件建筑构件达到耐火极限有三个条件，即：失去支持能力；完整性；失去隔火作用时为止的这段时间；只要三个条件中达到任一个条件，就确定其达到其耐火极限了。1）、失去支撑能力：如果试件在试验中受到*或高温作用下，承载能力和刚度降低，截面缩小，承受不了原设计的荷载而发生跨塌或变形量超过规定数值，则表明失去支持力。2）、失去完整性：主要指薄壁分隔构件（如楼梯、门窗、隔墙、吊顶等）在*或高温作用下，发生爆裂或局部塌落，形成穿透裂缝或孔洞，*穿过构件，使其背面可染物燃烧起来。如楼板受*或高温作用时，完整性被破坏，*穿到上层房间，表明楼板的完整性被破坏。3）、失去隔火作用：主要指起分隔作用的构件失去隔热过量热传导的性能。在试验中，如果构件的背火面测得的平均温度超过140℃，或背火面任一点温度超过初始温度180℃时，均表明构件失去隔火作用。经过大量的试验验证工作，建筑构件发生三者之一时耐火极限用时间来衡量，建筑墙体有承重墙、普通粘土墙及钢筋混凝土实体墙，它们的耐火极限分别为2.5～10.5h不等，这与墙的结构厚度有关（12cm～37cm）,具体见表4-1

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