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首页> 外文期刊>Journal of structural fire engineering >Residual shear capacity of cold-formed steel-to-sheathing screwed connections at elevated temperatures
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Residual shear capacity of cold-formed steel-to-sheathing screwed connections at elevated temperatures

机译：冷轧钢到护套的残留剪切容量在升高的温度下拧紧连接

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摘要

Purpose - Most previous thermal-mechanical modeling of cold-formed steel (CFS) walls did not consider the failure of screwed connections under fire conditions because of the limited data of such connections at elevated temperatures. Design/methodology/approach - In this study, 285 steady-state tests are conducted on CFS screwed connections with single-layer gypsum plasterboard (GPB) and Bolivian magnesium board (BMB) sheathing at ambient and elevated temperatures. The failure of these connections is described as the breaking of the loaded sheathing edge. Findings - For the BMB sheathing screwed connections, hydrochloric acid gas is generated and released above 300°C, and the shear strength becomes much less than that of the GPB sheathing screwed connection above 370°C. Hence, BMB may not be suitable for use as the face-layer sheathing of CFS walls but is still recommended to replace GPB as the base-layer sheathing. The major influencing parameters on the shear strength of screwed connections are identified as the type of sheathing material and the loaded sheathing edge distance. Originality/value - Based on the previous and present test results, a unified expression for the residual shear strength of screwed connections with GPB and BMB is proposed at ambient and elevated temperatures with acceptable accuracy. It can be used as the basic input parameter of the numerical simulation of the CFS structures under fire conditions.
机译：目的 - 最先前的冷成型钢（CFS）壁的热机械建模在火灾条件下没有考虑在火灾条件下的螺纹连接失效，因为这种连接在高温下的这种连接数据有限。设计/方法/方法 - 在本研究中，在CFS螺纹连接上进行285个稳态测试，与单层石膏板（GPB）和玻利维亚镁板（BMB）护套在环境温度下和升高的温度。这些连接的故障被描述为负载的护套边缘的断裂。研究结果 - 对于BMB护套螺纹连接，产生盐酸气体并释放到300℃以上，并且剪切强度变得远小于370℃以上的GPB护套螺纹连接。因此，BMB可能不适用于CFS壁的面层护套，但仍然建议将GPB替换为基层护套。螺纹连接剪切强度的主要影响参数被识别为护套材料的类型和负载的护套边缘距离。原创性/值 - 基于先前和目前的测试结果，在环境温度下提出了与GPB和BMB的螺纹连接的残留剪切强度的统一表达，并以可接受的精度升高。它可以用作火灾条件下CFS结构的数值模拟的基本输入参数。

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  • 来源
    《Journal of structural fire engineering》 |2021年第2期|212-233|共22页
  • 作者

    Kun Liu; Wei Chen; Jihong Ye; Jian Jiang; Wenwen Chen; Mingyue Zhao;

  • 作者单位

    Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering China University of Mining and Technology Xuzhou China and Xuzhou Key Laboratory for Fire Safety of Engineering Structures China University of Mining and Technology Xuzhou China;

    Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering China University of Mining and Technology Xuzhou China and Xuzhou Key Laboratory for Fire Safety of Engineering Structures China University of Mining and Technology Xuzhou China;

    School of Civil Engineering Southeast University Nanjing China;

    Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering China University of Mining and Technology Xuzhou China;

    School of Civil Engineering Southeast University Nanjing China;

    School of Civil Engineering Southeast University Nanjing China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Elevated temperatures; Screwed connection; Bolivian magnesium board; Gypsum plasterboard; Influencing parameters; Unified prediction expression;

    机译：高温;拧紧连接;玻利维亚镁板;石膏石膏板;影响参数;统一预测表达;

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