矩形钢管混凝土弯曲性能的试验与数值研究

IF 2.2 4区 工程技术 Q2 ENGINEERING, CIVIL Structural Engineering and Mechanics Pub Date : 2021-01-01 DOI:10.12989/SEM.2021.78.3.231
Tao Zhang, Gong Yongzhi, F. Ding, Xue-mei Liu, Zhi-wu Yu
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引用次数: 3

摘要

纯弯曲加载条件在实际工程中并不常见,但弯曲研究是复杂加载下力学性能研究的基础,具有重要意义。因此,本文的目的是通过实验和数值研究相结合的方法来研究矩形钢管混凝土(CFRT)的抗弯性能。通过弯曲试验研究了CFRT在弯曲作用下的力学性能。详细分析了加载过程中的载荷-挠度曲线。所有的试样都表现出很好的延展性。此外,根据试验结果,对钢管与核心混凝土的复合作用进行了研究和检验。通过与实验结果的比较,验证了数值方法的可行性和准确性。进一步对弯矩曲线和曲率曲线进行了全曲线分析,全面阐明了钢管和核心混凝土内部应力应变重分布的发展过程。需要注意的是,在加载过程中,核心混凝土与钢管之间存在粘结滑移。然后,进行了广泛的参数研究,包括钢强度、混凝土强度、钢比和长径比。最后给出了计算cfrt极限弯矩和抗弯刚度的设计公式。预测结果与实验和有限元结果吻合较好。此外,还说明了使用相关设计规范的试验/有限元计算结果与预测结果之间的差异。
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Experimental and numerical investigation on the behaviorof concrete-filled rectangular steel tubes under bending
Pure bending loading conditions are not frequently occurred in practical engineering, but the flexural researches are important since it's the basis of mechanical property researches under complex loading. Hence, the objective of this paper is to investigate the flexural behavior of concrete-filled rectangular steel tube (CFRT) through combined experimental and numerical studies. Flexural tests were conducted to investigate the mechanical performance of CFRT under bending. The load vs. deflection curves during the loading process was analyzed in detail. All the specimens behaved in a very ductile manner. Besides, based on the experimental result, the composite action between the steel tube and core concrete was studies and examined. Furthermore, the feasibility and accuracy of the numerical method was verified by comparing the computed results with experimental observations. The full curves analysis on the moment vs. curvature curves was further conducted, where the development of the stress and strain redistribution in the steel tube and core concrete was clarified comprehensively. It should be noted that there existed bond slip between the core concrete and steel tube during the loading process. And then, an extensive parametric study, including the steel strength, concrete strength, steel ratio and aspect ratio, was performed. Finally, design formula to calculate the ultimate moment and flexural stiffness of CFRTs were presented. The predicted results showed satisfactory agreement with the experimental and FE results. Additionally, the difference between the experimental/FE and predicted results using the related design codes were illustrated.
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来源期刊
Structural Engineering and Mechanics
Structural Engineering and Mechanics 工程技术-工程:机械
CiteScore
3.80
自引率
18.20%
发文量
0
审稿时长
11 months
期刊介绍: The STRUCTURAL ENGINEERING AND MECHANICS, An International Journal, aims at: providing a major publication channel for structural engineering, wider distribution at more affordable subscription rates; faster reviewing and publication for manuscripts submitted; and a broad scope for wider participation. The main subject of the Journal is structural engineering concerned with aspects of mechanics. Areas covered by the Journal include: - Structural Mechanics - Design of Civil, Building and Mechanical Structures - Structural Optimization and Controls - Structural Safety and Reliability - New Structural Materials and Applications - Effects of Wind, Earthquake and Wave Loadings on Structures - Fluid-Structure and Soil-Structure Interactions - AI Application and Expert Systems in Structural Engineering. Submission of papers from practicing engineers is particularly encouraged.
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