用有限元和机器学习模型对使用内圆形钢管增强的长方形CFRP封闭混凝土柱进行参数研究
Haytham F Isleem1, Besukal Befikadu Zewudie2, Alireza Bahrami3
1School of Applied Technologies, Qujing Normal University, Qujing 655011, Yunnan, China.
Heliyon
|December 16, 2024
概括
钢管用碳纤维增强聚合物 (CFRP) 封闭的混凝土柱显示出增强的强度,特别是对于强度较低的混凝土. 机器学习模型准确地预测列行为,极端梯度增强和随机森林表现最好.
科学领域:
- 结构工程 结构工程
- 材料科学 材料科学 材料科学
- 计算力学 计算力学 计算力学
背景情况:
- 结合碳纤维增强聚合物 (CFRP),混凝土和钢的柱子提供结构优势.
- 由于这些混合复合体柱的增强性质,研究兴趣越来越大.
- 了解这些柱子的轴负荷行为对于结构应用至关重要.
研究的目的:
- 为了研究圆角矩形CFRP封闭混凝土短柱的行为,内部具有高强度圆形钢管在轴承负载下.
- 分析混凝土等级,钢管厚度和尺寸以及CFRP厚度对柱子性能的影响.
- 开发和验证机器学习 (ML) 模型,用于预测最终轴负荷,轴应变和侧向应变.
主要方法:
- 使用非线性有限元素分析 (FEA),并根据实验数据进行验证.
- 进行了参数研究,以评估关键设计变量的影响.
- 开发和评估了多种机器学习模型,包括极端梯度增强,随机森林,人工神经网络和高斯过程回归.
主要成果:
- 与高强度混凝土相比,低强度混凝土经历了CFRP和钢材封闭的较大相对强度增强.
- 有限元模型准确地预测了列的行为.
- 与其他ML模型相比,极端梯度增强和随机森林模型在预测轴承负载,轴承应变和横向应变方面表现出卓越的准确性.
结论:
- 带有内部钢管的CFRP封闭混凝土柱提供了显著的结构优势,特别是对于强度较低的混凝土.
- 开发的ML模型为这些复合列的性能提供了可靠的预测.
- 机器学习,特别是极端梯度增强和随机森林,为预测先进结构元素的行为提供了强大的工具.
相关概念视频
01:17Design of Columns under a Centric Load
104
The design of columns under centric load is a fundamental aspect of structural engineering and is critical for ensuring the stability and integrity of structures. Euler's and Secant's formulas are central to understanding and calculating the critical load and deformation behaviors of columns, providing a basis for safe and effective structural design.
Euler's formula is applicable under the assumption that the column is a perfect, straight, homogenous prism, and it is operating...
Euler's formula is applicable under the assumption that the column is a perfect, straight, homogenous prism, and it is operating...
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01:15Euler's Formula to Columns with Other End Conditions
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Euler's formula is very important in the field of structural engineering, providing a foundation for understanding the critical loading conditions of pin-ended columns. This formula links the modulus of elasticity, the moment of inertia of the cross-section, and the column's length, offering a precise calculation of the critical load at which a column is prone to buckling.
461
01:21Design of Columns under an Eccentric Load
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Designing columns to withstand eccentric loads is a critical aspect of structural engineering, ensuring structures can support off-center loads without failure. This design process must account for the additional normal stresses introduced by eccentric loading, which can significantly influence a column's stress distribution and overall stability. An eccentric load applied to a column induces normal stresses that can be conceptualized as a combination of stresses due to an equivalent...
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01:21Euler's Formula for Pin-Ended Columns
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In structural engineering, the stability of columns under compressive axial loads is a critical consideration, described as buckling. A typical example involves a column PQ, which is pin-connected at both ends and subjected to a centric axial load F applied at one end, with a reaction force of F' = -F at the other end. Here, it is crucial to understand that when an applied load exceeds the critical load, buckling occurs as the system becomes unstable.
To calculate the critical load,...
To calculate the critical load,...
291
01:23Euler's Formula to Columns: Problem Solving
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Euler's formula is used in structural engineering to determine the buckling load of columns under various conditions. However, when dealing with systems that incorporate both rigid elements and elastic components, such as springs, the analysis requires a finer approach to determine the critical load. The problem described involves two rigid bars connected at a pivot point with a spring attached and a vertical load applied at one end.
The system comprises two vertical rigid bars, AB and BC,...
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01:23Design of Prismatic Beams for Bending
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