The effect of fire loading on a steel frame and connection
The effect of fire loading on a steel frame and connection
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DOI：
10.2495/hpsm040301
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发表时间：
2004-05
期刊：
影响因子：
--
通讯作者：
Adeeb A. Rahman;R. Hawileh;M. Mahamid
中科院分区：
文献类型：
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作者：
Adeeb A. Rahman;R. Hawileh;M. Mahamid
本文的目的是研究钢抗剪连接在严重火灾荷载条件下的性能。时程瞬态有限元分析被用来模拟火灾荷载。建立了梁柱节点中抗剪翼片钢连接的三维有限元模型。剪切翼板焊接在柱的腹板上，并通过紧固螺栓连接到梁的腹板上。钢材料的弹性模量、屈服强度、极限强度和热膨胀系数等性能的变化被认为是火灾荷载引起的温度升高的函数。模型中使用了高温下钢的应力-应变曲线。两种情况下的边界条件进行了研究：一个代表辊在梁的远端，另一个假设梁是销支撑。柱的基部保持为固定支撑，而柱的上边缘在垂直方向上自由偏转，如图2所示。预拉伸载荷被建模以表示螺栓的拧紧。根据ASTM E119进行的试验得出的防火曲线适用于连接件和结构构件。结果表明，传统的和新的耐火钢结构构件的挠度，旋转和变形场。机械和热塑性应变和应力场的预测，记录屈服，塑性和最终失败的板，螺栓和结构构件。这是一个三维非线性模型，提供了各种钢连接的图形和经验结果，可用于与现有的实验结果进行比较，如果可用。设计建议，故障限制，材料选择和规格，可以建议在这种火灾荷载的钢连接。
The objective of this paper is to investigate the behavior of steel shear connections subjected to severe fire loading conditions. A time-history transient FE analysis is used to model the fire loading. A detailed 3D FE model of an extended shear tab steel connection used in a beam-column joint is developed. The shear tab plate is welded to the web of the column and it is connected to the web of the beam by tightened bolts. The change in steel material properties such as the modulus of elasticity, yield and ultimate strength, and the coefficient of thermal expansion are considered as functions of increasing temperature resulting from fire loading. Stress-strain curves for steel at elevated temperatures are used in the model. Two cases of boundary conditions are studied: one representing a roller at the far end of the beam, another assumes that the beam is pin supported. The base of the column is maintained as a fixed support, while the upper edge of the column is free to deflect in the vertical direction as shown in Figure 2. Pre-tensioning loads are modeled to represent the tightening of the bolts. A fire curve based on tests conducted in accordance with ASTM E119, is applied to the connection and the structural members. Results show deflection, rotations, and distortion fields of the structural components for both conventional and new fire resisting steel. Mechanical and thermal plastic strain and stress fields are predicted, documenting yielding, plasticity and ultimate failure in the plate, bolts and structural members. This is a 3D nonlinear model that provides graphical and empirical results for a variety of steel connections that could be used for comparison with established experimental results if available. Design recommendations, failure limitations, and material selection and specifications can be suggested for steel connections in such fire loading.