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首页> 外文期刊>Journal of structural fire engineering >Fire performance of single plate shear connections in a composite floor
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Fire performance of single plate shear connections in a composite floor

机译：复合地板中单板剪切连接的防火性能

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Purpose - This paper aims to present a numerical investigation on the fire performance of a single plate shear connection in a steel-framed composite floor. Large-scale fire experiments show that the tensile membrane action of the concrete slab enhances the fire performance of composite floors. The enhancement in the performance is contributed to large slab deflections. However, these deflections cause significant rotations and tensile force in the single plate connection. Design/methodology/approach - A finite element model is constructed, which consists of a secondary steel beam, concrete slab and shear connection components. The interaction between the connection components such as bolts and single plate is defined by contact surfaces. The analysis is conducted in two uncoupled phases: thermal analysis by creating fire boundaries on the composite floor model with convective and radiative heat transfer, and mechanical analysis by considering thermal expansion and changes in the material stiffness and strength due to temperature. Findings - The thermo-mechanical analysis of the composite floor finite element model shows that the structure survives the 2-h Standard fire, but the connection fails by bolt shear and buckling of the connection plate. Originality/value - This paper investigates the fire performance of a shear connection in a steel-framed concrete slab. Previous work generally focused on the concrete slab behavior only. The originality of the research is that the connection is considered as part of a sub-assembly and is subjected to forces due to concrete and steel beam interaction.
机译：目的-本文旨在对钢框架复合地板中单板剪切连接的耐火性能进行数值研究。大规模的防火实验表明，混凝土板的拉伸膜作用增强了复合地板的防火性能。性能的提高是导致大板坯变形的原因。但是，这些偏转会在单板连接中引起明显的旋转和拉力。设计/方法/方法-构建了一个有限元模型，该模型由次级钢梁，混凝土板和剪切连接组件组成。连接组件（例如螺栓和单板）之间的相互作用由接触面定义。该分析分两个非耦合阶段进行：通过对流和辐射传热在复合地板模型上创建火边界来进行热分析，以及考虑热膨胀以及温度引起的材料刚度和强度变化来进行机械分析。研究结果-复合地板有限元模型的热机械分析表明，该结构在2小时标准火灾下仍能幸存，但由于螺栓剪切和连接板屈曲而导致连接失败。创意/价值-本文研究了钢框架混凝土板中剪力连接的防火性能。以前的工作通常只关注混凝土板的行为。该研究的独创性在于，该连接被视为子组件的一部分，并且由于混凝土和钢梁的相互作用而承受力。

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