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首页> 外文期刊>International journal of non-linear mechanics >A fully generalised approach to modelling fire response of steel-RC composite structures
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A fully generalised approach to modelling fire response of steel-RC composite structures

机译：钢-RC复合结构火灾响应建模的完全通用方法

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A three-step model for the performance-based numerical simulations of the fire response of steel-RC two-layered beam-like composite structures is presented and validated. The first step consists of the determination of the evolution of temperatures in the structure's surroundings. Moisture and the heat transfer through the RC layer and the conduction of heat over the steel layer are obtained in the second step. In concrete, the transfer of water vapour, dry air, and free water is discussed as well as the evaporation and liquefaction phenomena and the dehydration of concrete and its thermal and mechanical degradation. Within the framework of the third step, a geometrically and materially nonlinear mechanical response of the structure is proposed accounting for interlayer slips and uplifts as well as for various material-related phenomena such as the material hardening/softening and creep. The governing equations are solved numerically. An efficient, novel strain-based finite element formulation is introduced for the mechanical analysis. Due to its generality and consideration of several different possible non-linear material, geometrical, and interlayer contact phenomena and their couplings the model can be of a use to a broader fire science community for exploring the impact of different physical parameters on the results of the addressed numerical simulations, thereby providing directions for further research. In the paper a case of such a study is also demonstrated exploring the contribution of the steel sheet and the flexibility of the interlayer connection of a standard trapezoidal steel-RC slab to its ultimate fire resistance. A reasonable contribution of the sheet is proved if the stiffness ratio between the integrated and the external tensile reinforcement of the RC plate is low provided that the contact connection is sufficiently stiff.
机译：提出并验证了基于性能的钢-RC两层梁状复合结构火灾响应数值模拟的三步模型。第一步包括确定结构周围温度的变化。在第二步骤中获得了通过RC层的水分和热传递以及在钢层上的热传导。在混凝土中，讨论了水蒸气，干燥空气和自由水的转移，以及蒸发和液化现象以及混凝土的脱水及其热和机械降解。在第三步的框架内，提出了结构的几何和材料非线性机械响应，以说明层间滑移和隆起以及各种与材料有关的现象，例如材料的硬化/软化和蠕变。控制方程通过数值求解。介绍了一种有效的，基于应变的新型有限元公式，用于力学分析。由于其通用性并考虑了几种不同的可能的非线性材料，几何和层间接触现象及其耦合，因此该模型可用于更广泛的消防科学界，以探索不同物理参数对火成岩结果的影响。解决了数值模拟问题，从而为进一步研究提供了指导。在本文中，还进行了这样的研究，探讨了钢板的作用以及标准梯形钢-RC板的层间连接的挠性对其最终耐火性的影响。如果RC板的整体和外部抗拉加强件之间的刚度比低，且接触连接足够坚硬，则证明可以对板材做出合理的贡献。

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