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Experimental and numerical assessment of CHS-RHS T-joints with chords subjected to axial tensile forces
Advances in Structural Engineering ( IF 2.1 ) Pub Date : 2021-04-08 , DOI: 10.1177/13694332211003286
João Batista da Silva Neto 1 , Gabriel Vieira Nunes 2 , Arlene Maria Cunha Sarmanho 1 , Daniel José Rocha Pereira 1 , Messias Júnio Lopes Guerra 3 , Vinícius Nicchio Alves 1
Affiliation  

Hollow steel sections are widely used in the construction industry due to their mechanical properties. Joints used in these structures are the subject of research because of their singular and critical behavior. Joints containing chords with more slender cross-sections and axially loaded are still a challenge for design, especially in joints with circular hollow sections (CHS) in the braces and rectangular hollow sections (RHS) in the chords. In this context, this work aimed to study joints formed by a combination of CHS braces subjected to compression loads and RHS chords axially loaded with tension, welded as T-joints. Experimental tests, a numerical model using finite elements, and a parametric analysis were developed. A new equation for the chord stress function was proposed, including joints containing chords with semi-compact sections in tension. The joint resistance values obtained through the numerical models were compared with the equations from ISO 14346:2013 and with the proposed equation. It was observed that, for the numerical models with geometric properties inside the normative validity ranges of ISO 14346:2013, the mean rate of analytical by numerical joint resistance results was equal to 68%, using either the normative or the proposed equation. In the same way, for models outside the current validity ranges, either the proposed equation or the modified equation from ISO 14346:2013 could be used to design CHS-RHS T-joints with the geometric and material properties analyzed.



中文翻译:

承受轴向拉力的弦的CHS-RHS T型接头的实验和数值评估

中空钢型材由于其机械性能而广泛用于建筑业。这些结构中使用的关节由于其独特和关键的行为而成为研究的主题。包含截面更细长且轴向受力的弦杆的接缝仍然是设计上的挑战,特别是对于在支架中具有圆形空心截面(CHS)和在弦中具有矩形空心截面(RHS)的接头。在这种情况下,这项工作旨在研究由承受压缩载荷的CHS支撑和轴向受拉的RHS弦的组合所形成的接头,这些接头焊接成T型接头。开发了实验测试,使用有限元的数值模型以及参数分析。提出了弦应力函数的新方程,包括包含弦的关节,其张力为半紧凑部分。通过数值模型获得的接头电阻值与ISO 14346:2013中的方程式和提出的方程式进行了比较。可以观察到,对于几何属性在ISO 14346:2013的标准有效范围内的数值模型,无论是使用标准公式还是建议的方程,通过数值联合阻力结果得出的平均分析率等于68%。同样,对于当前有效性范围之外的模型,可以使用建议的方程式或ISO 14346:2013的改进方程式来设计具有几何和材料特性的CHS-RHS T型接头。2013年,并提出了方程式。可以观察到,对于几何属性在ISO 14346:2013的标准有效范围内的数值模型,无论是使用标准公式还是建议的方程,通过数值联合阻力结果得出的平均分析率等于68%。同样,对于当前有效性范围之外的模型,可以使用建议的方程式或ISO 14346:2013的改进方程式来设计具有已分析几何和材料特性的CHS-RHS T型接头。2013年,并提出了方程式。可以观察到,对于几何属性在ISO 14346:2013的标准有效范围内的数值模型,无论是使用标准公式还是建议的方程,通过数值联合阻力结果得出的平均分析率等于68%。同样,对于当前有效性范围之外的模型,可以使用建议的方程式或ISO 14346:2013的改进方程式来设计具有几何和材料特性的CHS-RHS T型接头。

更新日期:2021-04-09
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