耐火试验.建筑构件.第13部分:带腹板开口的钢梁的防火试验和评定要求

[中文适用范围]： 本文件规定了一种测试和评估方法，用于确定防火系统对结构钢梁、I型和H型截面的耐火性能的贡献，在水平面上包含腹板中可能影响梁的结构性能的开口。 它适用于三面或四面受火暴露的梁。 对于具有单个腹板开口或腹板开口被认为直径相对于腹板深度较小的任何蜂窝梁，本文件的适用性旨在由结构工程师确定本文件采用建立以下比率的原则：梁腹板开口之间和周围的温度以及该梁实心部分的温度。 这样做的目的是，可以在结构模型中利用这些数据来导出梁在火灾极限状态下的相关极限温度的值和位置。 然后将极限温度与 ISO 834-10 和 ISO 834-11 确定的防火材料数据结合使用，以确定具有腹板开口的梁所需的防火材料厚度。 本文件适用于已经根据 ISO 834-10 和 ISO 834-11 进行测试和评估的防火材料，不适合单独使用。 它涵盖了包含被动和反应材料的消防系统，这些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) 作为确定带腹板开口梁的防火厚度的基础。 本文件包含一种评估方法，规定了如何对测试数据进行分析，并对可以采取的程序提供指导。 评估程序可用于建立： a) 基于测试卸载钢截面的温度数据，消防系统对蜂窝梁的热响应（热性能）。 b) 卷材柱与卷材参考温度之间的温度比，该温度比根据卷材柱宽度而变化。 c) 腹板开口周围点与腹板参考区域之间的温度比。 d) 可用于导出蜂窝梁的极限温度的结构模型。 [外文原描述]： 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.