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首页> 外文期刊>Thin-Walled Structures >A simplified approach for calculating temperatures in axially loaded cold-formed thin-walled steel studs in wall panel assemblies exposed to fire from one side
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A simplified approach for calculating temperatures in axially loaded cold-formed thin-walled steel studs in wall panel assemblies exposed to fire from one side

机译：一种计算从一侧着火的壁板组件中轴向加载的冷成型薄壁钢钉中温度的简化方法

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摘要

Cold-formed thin-walled steel sections are usually used as the load-bearing elements of wall panels in building construction. Such panels consist of channel steel sections with gypsum plasterboard layers attached to the flanges on the outside and interior insulation. This paper proposes a simple method to calculate temperature distributions in the steel section when the panel is exposed to fire from one side. This method calculates the average temperatures in the flanges of the steel section and assumes that the temperature in the web is linear. The proposed method is based on simple heat balance analysis for a few nodes representing the key components of the panel. The thermal resistance of these nodes is obtained from the weighted average of thermal resistances in an effective width of the panel within which heat transfer in the panel width direction is assumed to occur. The effective width of the panel for calculating the weighted average of thermal resistances can be taken as the steel section flange width plus 15% of the difference between 300 mm and the flange width of the steel section. Validity of the proposed method has been checked by comparison of the temperature results between the proposed 1-D modelling and 2-D ABAQUS Finite Element modelling for an extensive set of parametric and sensitivity studies covering different steel section dimensions (width, depth, thickness and lips), different spacing between steel section, number of gypsum layers (1 or 2) and different interior insulation properties. Further assessment of accuracy of the proposed temperature calculation method has been provided by comparing compressive resistance of the steel studs between using temperature profiles produced by 2-D ABAQUS Finite Element simulation and by using the proposed simplified method. Although the simplified method still requires a numerical procedure, it is extremely easy to implement to give designers of this structural system a much more efficient tool than using Finite Element simulations to calculate its fire resistance.
机译：冷弯薄壁型钢通常用作建筑结构中墙面板的承重元件。此类面板由槽钢型材组成，石膏外墙层的石膏板固定在外部和内部隔热层的法兰上。本文提出了一种简单的方法来计算面板从一侧着火时在钢截面中的温度分布。该方法计算钢段法兰的平均温度，并假定腹板中的温度是线性的。所提出的方法基于简单的热平衡分析，对代表面板关键部件的几个节点进行了分析。这些节点的热阻是从面板有效宽度内热阻的加权平均值中得出的，在该有效宽度内假定发生了面板宽度方向上的热传递。用于计算热阻加权平均值的面板的有效宽度可以取为钢截面的法兰宽度加上300 mm与钢截面的法兰宽度之差的15％。通过比较建议的一维模型和二维ABAQUS有限元模型之间的温度结果，检验了所提出方法的有效性，该模型用于涵盖不同钢截面尺寸（宽度，深度，厚度和唇），钢型材之间的间距不同，石膏层数（1或2）和不同的内部隔热性能。通过比较使用2-D ABAQUS有限元模拟产生的温度曲线和使用所提出的简化方法之间的钢栓的抗压强度，可以进一步评估所提出的温度计算方法的准确性。尽管简化方法仍然需要数值过程，但与使用有限元模拟来计算其耐火性相比，为该结构系统的设计人员提供一种效率更高的工具非常容易实现。

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