Improving fire resistance of existing concrete slabs by concrete topping

机译：通过混凝土顶部提高现有混凝土板的耐火性

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Most codes are meant for the design of new buildings and are not developed for application to existing buildings. In practice, however, they are also used for the verification of structural components in the case of building renovation work. In the case of presumed resistance problems, an easy way to deal with this is adding external reinforcement. This is due to the limited loss in height. But this becomes a costly operation when extra fire protection has to be added. A review is made of the different failure mechanisms which leads to alternative bearing paths that can be imagined, avoiding these classic reinforcement techniques. Out of those, a way of thinking is proposed with an extra topping, designed by a simple analytical method, which is already stated in the EN 1992-1-2 (annex E). By doing so, we are fulfilling all static equilibriums, are capable of increasing the fire resistance and improving the acoustic performance + thermal inertia of such a slab. Verifications are done by an FEM analysis of a case-study with the use of an explicit transient creep material model for the concrete to avoid numerical problems. Furthermore, the simplicity and possibilities of the proposed method are shown.

机译：大多数代码都是为了设计新建筑物，并且不开发用于应用于现有建筑物。然而，在实践中，它们也用于在建立装修工作的情况下验证结构部件。在推定抵抗问题的情况下，处理此简单方法正在添加外部钢筋。这是由于高度损失有限。但是，当必须添加额外的防火保护时，这成为昂贵的操作。审查是由不同的故障机制制成，这导致可以想象的替代轴承路径，避免这些经典增强技术。在那些之外，提出了一种思维方式，额外的顶部，由简单的分析方法设计，该方法已经在EN 1992-1-2（附件e）中陈述。通过这样做，我们正在满足所有静态均衡，能够增加耐火性和改善这种板坯的声学性能+热惯性。通过对混凝土的明确瞬态蠕变材料模型进行案例研究的FEM分析来完成验证，以避免数值问题。此外，示出了所提出的方法的简单性和可能性。

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《International Conference of Applications of Structural Fire Engineering》|2018年|404p|共10页
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T. Molkens;
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1. Longitudinal shear resistance of composite slabs containing crumb rubber in concrete toppings [J] . Niall Holmes, Kevin Dunne, John ODonnell Construction and Building Materials . 2014,第Mara期

机译：混凝土顶层含橡胶碎石复合板的纵向剪切强度。
2. Rational concrete cover of prestressed concrete beams and slabs for fire resistance [J] . ZHENG Wen-zhong, HOU Xiao-meng, XU Ming-xin 哈尔滨工业大学学报（英文版） . 2009,第005期

机译：预应力混凝土梁和楼板的合理混凝土覆盖层，具有良好的耐火性
3. Rational concrete cover of prestressed concrete beams and slabs for fire resistance [J] . 郑文忠, 侯晓萌, 许名鑫哈尔滨工业大学学报：英文版 . 2009,第005期

机译：预应力混凝土梁和楼板的合理混凝土覆盖层，具有良好的耐火性
4. Improving fire resistance of existing concrete slabs by concrete topping [C] . T. Molkens International Conference of Applications of Structural Fire Engineering . 2018

机译：通过混凝土顶部提高现有混凝土板的耐火性
5. FIRE RESISTANCE OF CONCRETE-FILLED AND REINFORCED CONCRETE COLUMNS. [D] . EL-SHAYEB, MOHAMED. 1986

机译：填充混凝土和增强混凝土柱的耐火性。
6. Interpretation of Impact-Echo Testing Data from a Fire-Damaged Reinforced Concrete Slab Using a Discrete Layered Concrete Damage Model [O] . Changkye Lee, Seong-Hoon Kee, Jun Won Kang, 2020

机译：使用离散分层混凝土损伤模型解释火灾钢筋混凝土板的冲击回声测试数据
7. Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol. of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol. of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance. [O] . 2017

机译：研究了高温暴露后各种混凝土高温曝光机械性能各种混凝土的机械性能。考虑到高层建筑中垂直元件的抗压强度要求，测试了35,80,100和150MPa各种设计强度的混凝土试样。特别是，在这项研究中，掺入钢纤维对耐火性的影响。实验结果表明，耐火性取决于设计强度和钢纤维含量。在暴露于100-400°C的温度时，80-100MPa的设计强度为35MPa或高性能混凝土（HPC）的正常强度混凝土（NSC）不会击落。然而，当HPC含有1体积的钢纤维的百分比时，爆炸性剥落发生在300℃。超高性能混凝土（UHPC）的设计强度为150 MPa和1.5 Vol。钢纤维的百分比也显示出300℃的剧烈剥落。本研究中发现的实验结果可以有助于更好地了解在火灾中的HPC和UHPC的行为以及钢纤维对耐火性的作用。
8. THIN BONDED CONCRETE SURFACINGS APPLIED TO EXISTING CONCRETE ROAD SLABS [R] . R. I. T. Williams 1959

机译：薄粘结混凝土表面应用于现有的混凝土路面板

Improving fire resistance of existing concrete slabs by concrete topping

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