相关实验视频
Updated: Sep 11, 2025

09:17
Surrogate Model Development for Digital Experiments in Welding
Published on: March 28, 2025
1.2K
实验和数值研究FRP康复RC梁柱连接在高温与人工神经网络的高温
R Surya Prakash1, N Parthasarathi2
1Department of Civil Engineering, College of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, Chengalpattu Dt, Tamil Nadu, 603203, India.
Scientific reports
|August 16, 2025
概括
这项研究评估了纤维增强聚合物 (FRP) 在高温下在钢筋混凝土接头中的性能. 与玻璃FRP (GFRP) 和阿拉米德FRP (AFRP) 相比,碳FRP (CFRP) 显示出更好的结构完整性和热耐久性.
科学领域:
- 结构工程 结构工程
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
背景情况:
- 钢筋混凝土 (RC) 梁柱连接需要恢复结构完整性和热耐用性.
- 纤维增强聚合物 (FRP) 越来越多地用于结构改造,但它们在高温下的性能尚不清楚.
- 现有的研究还没有充分探讨FRP在受极端高温影响的RC关节中的行为.
研究的目的:
- 调查RC梁柱连接的结构完整性和热耐用性,这些连接在高温下,高达800°C,用FRP层材进行修复.
- 为了比较不同类型的FRP (CFRP,GFRP,AFRP) 在热应力下的性能.
- 用计算,实验和机器学习方法开发和验证联合行为预测模型.
主要方法:
- 在36个模型上进行了合热力学有限元模拟 (9个是传统的,27个是康复的).
- 进行了实验测试,以验证模拟结果并评估负载能力和核心温度.
- 人工神经网络 (ANN) 回归模型被开发用于预测关节偏移和节点温度.
主要成果:
- 在500°C时,CFRP复合的关节比GFRP的曲率低42.8%,应力低37.2%.
- 实验测试证实了CFRP的优越性,与GFRP相比,显示了28.5%更高的负载能力和31.6%更低的故障核心温度.
- 在预测偏移和节点温度方面,ANN模型实现了高精度 (R2 > 0.99),并与模拟和实验数据密切匹配.
结论:
- 碳FRP (CFRP) 在高温下,特别是在恢复前的400°C和恢复后的500°C下,证明了恢复RC梁-柱接头的最佳性能.
- 结合计算,实验和机器学习方法的综合方法提供了以性能为导向的FRP恢复的全面框架.
- 该研究确定了关节核心,特别是在与梁相邻的柱面上,作为热应力下最脆弱的区域.
相关概念视频
Deformation of a Beam under Transverse Loading
429
Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
The insights from the bending moment diagram extend to...
The insights from the bending moment diagram extend to...
429
Fiber Reinforced Concrete
130
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
130
Design of Prismatic Beams for Bending
370
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
370
Shearing Stresses in a Beam: Problem Solving
302
A cantilever beam with a rectangular cross-section under distributed and point loads experiences shearing stresses. The analysis begins by identifying the loads acting on the beam. Then, the reactions at the beam's fixed end are calculated using equilibrium equations. The vertical reaction is a combination of the distributed and point loads, while the moment reaction is the sum of their moments. The shear force distribution along the beam, resulting from these loads, is established by...
302
Beams with Unsymmetric Loadings
168
Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
168
Fatigue Strength of Concrete
285
Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
285

