耐火试验 建筑构件 第6部分:梁的特殊要求

[中文适用范围]： ISO 834 的这一部分规定了在单独测试时确定梁的耐火性时应遵循的程序。 梁的测试通常是在其底面和两个垂直面完全受热的情况下进行的。 然而，当曝光来自四个侧面或少于三个侧面时，需要适当的曝光条件。 作为楼板结构一部分的梁按照 ISO 834-5 中的规定与楼板结构一起进行测试，并接受完整性和绝缘性评估。 当结构符合 ISO 834 本部分给出的直接应用领域或根据 ISO/TR 12470 进行扩展应用分析时，将该测试应用于其他未经测试的结构形式是可接受的。 TR 12470 仅给出一般指南，具体的扩展应用分析只能由耐火结构方面的专家进行。 附录 A 给出了该测试方法的一般指导。 [外文原描述]： This part of ISO 834 specifies the procedures to be followed for determining the fire resistance of beams, when tested on their own. Beams are normally tested with their underside and two vertical sides fully exposed to heating. However, when the exposure is from four sides or less than three sides, appropriate exposure conditions are necessary. Beams which are part of a floor construction are tested with the floor construction as described in ISO 834-5 and are subject to evaluation of integrity and insulation. The application of this test to other untested forms of construction is acceptable when the construction complies with the direct field of application as given in this part of ISO 834 or when subjected to an extended application analysis in accordance with ISO/TR 12470. Since ISO/TR 12470 gives only general guidelines, specific extended application analyses are to be performed only by persons expert in fire-resistant constructions. General guidance on this test method is given in annex A.