本文件规定了一种试验和评估方法，用于确定防火系统对结构钢梁（I型和H型截面）在水平面内的耐火性的贡献，该水平面包含可能影响梁结构性能的腹板开口。适用于三面或四面受火的梁。 对于任何带有单个腹板开口的蜂窝梁，或者如果腹板开口的直径相对于腹板深度较小，则本文件的适用性应由结构工程师确定 本文件采用的原则是，确定梁腹板开口之间和周围的温度与梁实体部分的温度之比。这样做的目的是，这些数据可以在结构模型中使用，以推导火灾极限状态下梁的相关极限温度值和位置。 然后，将极限温度与根据ISO 834-10和ISO 834-11确定的防火材料数据结合使用，以确定带腹板开口的梁所需的防火材料厚度。 本文件适用于已根据ISO 834-10和ISO 834-11进行测试和评估且不打算单独使用的防火材料。它涵盖了消防系统，包括被动和反应性材料，遵循本文件中定义的截面轮廓。 本文件包括使用源自ISO 834-11的多温度分析（MTA）作为确定腹板开口梁防火厚度的基础。 本文件包含一种评估方法，该方法规定了应如何对测试数据进行分析，并对可能采取的程序提供了指导。 评估程序可用于确定: a） 基于测试空载型钢得出的温度数据，蜂窝梁上消防系统的热响应（热性能）。 b） 网柱和网参考温度之间的温度比，其将根据网柱宽度而变化。 c） 腹板开口周围的点与腹板参考区域之间的温度比。 d） 可用于推导蜂窝梁极限温度的结构模型。

This document specifies a test and assessment method for determining the contribution made by fire protection systems to the fire resistance of structural steel beams, I and H sections, in the horizontal plane containing openings in the web which may affect the structural performance of the beam. It is applicable to beams subjected to three or four sided fire exposure. For any cellular beam with a single web opening or where the web openings are considered to be of small diameter in relation to the web depth the applicability of this document is intended to be determined by a structural engineer This document adopts the principle of establishing ratios of temperatures between and around openings in the web of a beam with the temperatures of a solid portion of that beam. This is with the intention that these data can be utilised within a structural model to derive the value and location of the associated limiting temperature of the beam at the fire limit state. The limiting temperature is then used in conjunction with data for the fire protection material determined from ISO 834-10 and ISO 834-11 to determine the necessary thickness of fire protection material for beams with web openings. This document applies to fire protection materials that have already been tested and assessed in accordance with ISO 834-10 and ISO 834-11 and is not intended to be used in isolation. It covers fire protection systems that include both passive and reactive materials which follow the section profile as defined in this document. This document includes the use of a multi-temperature analysis (MTA) derived from ISO 834-11 as the basis for determining the thickness of fire protection for beams with web openings. This document contains an assessment method, which prescribes how the analysis of the test data should be made and gives guidance on the procedures that could be undertaken. The assessment procedure can be used to establish: a) The thermal response of the fire protection system on cellular beams, (the thermal performance) on the basis of the temperature data derived from testing unloaded steel sections. b) The temperature ratio between the web post and the web reference temperature, which will vary depending on the web post width. c) The temperature ratio between points around the web openings and the web reference area. d) A structural model that can be used to derive limiting temperatures for cellular beams.