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Structural performance of a post-tensioned concrete floor during horizontally travelling fires

机译:在水平行进的火灾中后张预应力混凝土地板的结构性能

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This paper highlights the structural performance of a bonded post-tensioned concrete floor subject to fires that travel horizontally between zones within the floorplate. The floorplate was previously analysed by the authors based on experimental and numerical investigations on one-way spanning bonded post-tensioned concrete slab strips. In the previous studies, a nonlinear finite element model was developed for the floor that considered the mechanical and thermal material nonlinearities of the floor's components, interfaces between the components, different natural fire severities, different applied static load during the fire and different restraint conditions. The previous studies highlighted the importance of investigating the whole-building behaviour and provided a useful insight into the temperature distribution throughout the floor slab, failure modes, comparisons with current design rules and time-displacement behaviour of the floor under fire conditions. This paper extends the previous studies and uses the validated finite element model to investigate different horizontal travelling fire scenarios between zones and different inter-zone time delays to represent fire travelling time. The time-temperature distribution throughout the floor slab was predicted at different locations in the floor subject to travelling fires. Furthermore, the time-deflection and time-axial displacement relationships were predicted at different locations in the floor. The current study has shown that horizontally travelling fire scenarios and the inter-zone time delay affect the time-deflection behaviour considerably. The change in heating/cooling scenarios between zones has resulted in a cyclic deflection pattern, which has previously not been considered when designing post-tensioned concrete floors against fire. Based on the analysis of the results presented, it is shown that the worst case in terms of maximum vertical defection or maximum residual deflection, at a given point in the floorplate, could occur either under the assumption of a uniform fire or a travelling fire. It is therefore recommended that designers should consider the integrity of floorplates using various travelling fires. 【Keywords】Bonded tendons;Fire tests;Modelling;Post-tensioned concrete floors;Travelling fire;
机译:本文着重介绍了在地板之间区域之间发生火灾的情况下,后张紧的粘结混凝土地板的结构性能。作者先前根据单向跨度粘结后张预应力混凝土板条的实验和数值研究,对地板进行了分析。在先前的研究中,针对地板开发了非线性有限元模型,该模型考虑了地板部件的机械和热材料非线性,部件之间的界面,不同的自然火灾强度,火灾期间施加的静态载荷以及不同的约束条件。先前的研究强调了调查整个建筑物行为的重要性,并提供了对整个楼板温度分布,破坏模式,与当前设计规则的比较以及火灾条件下楼板的时空位移的有用见解。本文扩展了先前的研究,并使用经过验证的有限元模型来研究区域之间不同的水平行进火情,并使用不同的区域间时间延迟来表示火灾行进时间。预测了整个楼板的时间-温度分布,该变化是在地板上受火灾影响的不同位置进行的。此外,在地板的不同位置预测了时间挠度和时间轴位移关系。当前的研究表明,水平行进的火灾场景和区域间时间延迟对时间偏转行为有很大影响。区域之间加热/冷却方案的变化导致了周期性的偏转模式,这在设计后张紧的混凝土楼板防火时从未考虑过。根据对结果的分析,表明在地板的给定点上,在最大垂直变形或最大残余变形方面,最坏的情况可能是在均匀着火或移动着火的假设下发生的。因此,建议设计人员应考虑使用各种移动火源的地板的完整性。 【关键词】粘结筋;耐火试验;建模;后张混凝土楼板;耐火;耐火性能

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