| Related citation: | Kun Liu,Wei Chen1，2，Jihong Ye,Yuze Yang,Jian Jiang,Yafei Qin.Double-Shear Experiments of Cold-Formed Steel Stud-to-Sheathing Connections at Elevated Temperatures[J].Journal of Harbin Institute Of Technology(New Series),2021,28(6):44-62.DOI:10.11916/j.issn.1005-9113.20060. |
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| Author Name | Affiliation | | Kun Liu | Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining & Technology, Xuzhou 221116, China | | Wei Chen1，2，Jihong Ye | Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining & Technology, Xuzhou 221116, China | | Yuze Yang | Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining & Technology, Xuzhou 221116, China | | Jian Jiang | Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining & Technology, Xuzhou 221116, China | | Yafei Qin | Shanghai Beststeel Steel Structure Building System Co., Shanghai 200949, China |
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| Abstract: |
| The behavior of cold-formed steel (CFS) stud-to-sheathing connections at elevated temperatures is an important parameter for the fire resistance design and modeling of mid-rise CFS structures. In this paper, three kinds of sheathings, namely, medium- and low-density calcium-silicate boards and oriented strand board, were selected for double-shear experiments on the mechanical properties of 253 screw connections at ambient and elevated temperatures. The effects of the shear direction, screw edge distance and the number of screws on the behavior of the connections were studied. The results showed that the shear direction and the screw edge distance more significantly influenced the peak deformation, while their impacts on the peak load varied with the type of sheathings. Compared with the single-screw connections, the peak loads of the specimens with double-screw connections obviously increased but did not double. Finally, a simplified load-displacement curve model of stud-to-sheathing connections at elevated temperature was generated first by establishing the prediction formula for characteristic parameters, such as the peak load, the peak deformation and the elastic stiffness, and then by considering whether the curves corresponded to stiffness increase phenomena. The present investigation provides basic data for future studies on the numerical modeling of CFS structures under fire conditions. |
| Key words: cold-formed steel structures stud-to-sheathing screw connections double-shear experiments elevated temperature load-displacement model |
| DOI：10.11916/j.issn.1005-9113.20060 |
| Clc Number:TU392.5 |
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| Descriptions in Chinese: |
| 冷成型钢龙骨-覆面板材自攻螺钉连接件高温双剪试验研究 刘 琨1，陈 伟1,2，叶继红1，杨玉泽1，姜 健1，秦雅菲3 （1，中国矿业大学 江苏省土木工程环境灾变与结构可靠性重点实验室，徐州221116；2，建筑消防工程技术公安部重点实验室，天津300381；3，上海钢之杰钢结构建筑系统有限公司，上海200949） 摘要：冷成型钢龙骨-覆面板材自攻螺钉连接件的高温力学性能是进行多层冷成型钢结构抗火设计与数值模拟研究的重要参数。本文选取中密度波特板、低密度波特板和定向刨花板三种覆面板材，共计完成了253次自攻螺钉连接件的常温及高温双剪试验研究。考察了剪力方向、螺钉边距和螺钉数目对其力学性能的影响。研究表明：剪力方向和螺钉边距对峰值变形的影响更加明显，对峰值荷载影响程度因板材种类不同而有所不同；螺钉数目为两根螺钉时试件的峰值荷载明显提高，但大多达不到2倍的提高比例。最后，基于试验结果，先确定峰值荷载、峰值变形和弹性刚度等特征参数预测公式，进而考虑荷载位移曲线是否出现刚度增大现象，提出了简化的高温连接件荷载位移曲线模型，为后续冷成型钢结构的受火数值模拟研究提供了所需的基础性数据。 关键词：冷成型钢结构；钢龙骨-覆面板材自攻螺钉连接件；抗剪试验；高温；荷载位移曲线模型 |
