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首页> 外文期刊>International journal of steel structures >Predicting the Demand of Shear Tab Connections with Composite Beams in Fire
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Predicting the Demand of Shear Tab Connections with Composite Beams in Fire

机译：用火中的复合梁预测剪切片连接的需求

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摘要

Shear tab connections are one of the most commonly used simple beam-end framing connections. Simple connections are designed to resist shear forces at ambient temperature. This study aims at identifying the key parameters that affect the behavior of composite beams with shear tab connections under fire. Large axial forces are generated during a fire event due to the thermal expansion of the materials. These forces, which are not considered in the design, could lead to connection failure. In this study, finite element (FE) models are developed in Abaqus and validated against experimental data available in the literature. The strength degradation of the steel material at elevated temperatures is accounted for using retention factors. Concrete damage plasticity is implemented to model the concrete behavior at high temperatures. FE simulations are then performed to investigate the effect of different parameters on the behavior of shear tab connections in composite beams subjected to fire. The main parameters are: load ratio, concrete slab temperature, shear tab thickness, setback distance, bolt diameter, in addition to the creep in the concrete and the partial composite action. This proposed research provides more guidance on the effect of thermally induced forces and deformations of shear tab connections with composite beams. It also provides the basis for developing simple methods of analysis.
机译：剪切标签连接是最常用的简单光束端框架连接之一。简单的连接设计以抵抗环境温度的剪切力。本研究旨在识别影响在火灾中具有剪切片连接的复合梁行为的关键参数。由于材料的热膨胀，在火灾事件期间产生大的轴向力。这些不考虑在设计中的力可能导致连接失败。在本研究中，有限元（FE）模型在ABAQUS中开发并验证了文献中可用的实验数据。借助保留因子，算用于升高温度下钢材的强度劣化。实施混凝土损伤可塑性以在高温下模拟混凝土行为。然后进行FE模拟以研究不同参数对经受火灾的复合梁的剪切片连接行为的影响。主要参数是：负载比，混凝土平板温度，剪切片厚度，挫折，螺栓直径，除了混凝土中的蠕变和部分复合动作。该拟议的研究提供了更多关于与复合梁的热引起力和剪切突片连接的变形的影响的更多指导。它还为开发简单的分析方法提供了基础。

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