正面对火反应的试验.第2部分:大尺度的试验

[中文适用范围]： ISO 13785 的这一部分规定了一种测试方法，用于确定当暴露于模拟室内隔间火灾的热量和火焰时，材料和外墙覆层结构对火灾的反应，火焰通过窗户开口喷出并直接撞击外墙。 该测试生成的信息也可能适用于外部火灾冲击立面的情况；然而，结果可能并不适用于所有火灾暴露条件。 此方法仅适用于非承重的外墙和覆层。 没有尝试确定立面或覆层的结构强度。 该测试并非旨在确定给定建筑立面的防火性能。 本次测试不考虑阳台、窗户、百叶窗、窗帘等细节。 该测试不包括火灾蔓延的风险，例如通过立面系统的窗户细节，因为它仅被构造为立面墙。 有明确的证据表明，内角（也称为凹角）配置比平坦的立面产生更强烈的火灾暴露。 最常见的内凹角是 90° 角。 因此，测试立面样本包含一个凹角为 90° 的内角。 所描述的测试方法旨在评估建筑物的外墙和覆层内是否含有可燃成分，而这些建筑物的外墙和覆层是不可燃结构的。 [外文原描述]： ISO 13785-2:2002 specifies a method of test for determining the reaction to fire of materials and construction of façade claddings when exposed to heat and flames from a simulated interior compartment fire with flames emerging through a window opening and impinging directly on the façade. The information generated from this test may also be applicable to the scenario of an external fire impinging on a façade; however, the results may not be applicable for all fire exposure conditions. This method is applicable only to façades and claddings that are non-loadbearing. No attempt is made to determine the structural strength of the façade or cladding. This test is not intended to determine the fire behaviour of a given building façade. Details such as balconies, windows, window shutters, curtains, etc., are not considered in this test. This test does not include the risk of fire spread e.g. through the window details of the façade system as it only is constructed as a façade wall. There is clear evidence that an internal corner (also called a re-entrant corner) configuration produces a more intense fire exposure than a flat façade. The most commonly encountered internal re-entrant corner is with an angle of 90°. The test façade specimen therefore contains an internal corner with a re-entrant angle of 90°. The test method described is intended to evaluate the inclusion of combustible components within façades and claddings of buildings which are otherwise of non-combustible construction.