Experimental Research and Numerical Analysis on the Concrete-Filled Square CFRP Steel Tube Column Under Compressive-Shear Loading

IF 1.1 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

International Journal of Steel Structures Pub Date : 2024-06-22 DOI:10.1007/s13296-024-00860-5

Kuan Peng, Qing-li Wang, Yong-bo Shao

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Abstract

A large number of concrete-filled CFRP steel tube structures are widely used in practical engineering at current. Considering that as a column structure, compressive-shear loading is a more important bearing capacity method. 12 specimens are designed to study the comperssive-shear performance of concrete filled CFRP steel tube. The shear loading- displacement (V-Δ) curves and the collaborative work performance between the steel tube and CFRP are tested. Based on the tests, a numerical simulation method is firstly proposed to estimate the compressive-shear performance of concrete-filled CFRP steel tube stub column, and then validated against the representative tests results.Parametric study is conducted to explore the influence of principle factors on compresive-shear behaviour by verified numerical models. The experimental results show that the steel tube and CFRP can work together. As the axial compression ratio increases, the shear displacement of the specimen is constrained, resulting in increase of bearing capacity. Additionally, the increase of steel ratio, CFRP layers and materials strength for specimens enhance not only the bearing capacity but also the initial stiffness. The simulation results of the established finite element model are in good agreement with the experimental results. Finally, Based on experimental and finite element results, the bearing capacity correlation equation for concrete-filled square CFRP steel tublar stub columns when subjected to compressive-shear loading is presented.

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抗压抗剪荷载下混凝土填充方形 CFRP 钢管柱的实验研究与数值分析

目前，大量混凝土填充 CFRP 钢管结构被广泛应用于实际工程中。考虑到作为柱结构，压剪荷载是一种更重要的承载能力方法。为研究混凝土填充 CFRP 钢管的抗压抗剪性能，我们设计了 12 个试件。测试了剪切荷载-位移（V-Δ）曲线以及钢管和 CFRP 的协同工作性能。在试验的基础上，首先提出了一种数值模拟方法来估算混凝土填充 CFRP 钢管支柱的抗压抗剪性能，然后根据代表性试验结果进行了验证。实验结果表明，钢管和 CFRP 可以协同工作。随着轴向压缩比的增加，试样的剪切位移受到约束，从而提高了承载能力。此外，试样的钢材比、CFRP 层数和材料强度的增加不仅提高了承载能力，还提高了初始刚度。建立的有限元模型模拟结果与实验结果非常吻合。最后，基于实验和有限元结果，给出了混凝土填充方形 CFRP 钢管支柱在承受压缩-剪切荷载时的承载力相关方程。

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来源期刊

International Journal of Steel Structures 工程技术-工程：土木

CiteScore

2.70

自引率

13.30%

发文量

122

审稿时长

12 months

期刊介绍： The International Journal of Steel Structures provides an international forum for a broad classification of technical papers in steel structural research and its applications. The journal aims to reach not only researchers, but also practicing engineers. Coverage encompasses such topics as stability, fatigue, non-linear behavior, dynamics, reliability, fire, design codes, computer-aided analysis and design, optimization, expert systems, connections, fabrications, maintenance, bridges, off-shore structures, jetties, stadiums, transmission towers, marine vessels, storage tanks, pressure vessels, aerospace, and pipelines and more.