Numerical simulation and design of circular steel-reinforced concrete-filled steel tubular short columns under axial loading

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Magazine of Concrete Research Pub Date : 2023-12-20 DOI:10.1680/jmacr.23.00153

Mizan Ahmed, Saad A. Yehia, Ramy I. Shahin, Mohamed Emara, Vipulkumar Ishvarbhai Patel, Qing Quan Liang

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Abstract

This paper presents a computational model for determining the axial responses of circular Steel-Reinforced Concrete-Filled Steel Tubular (SRCFST) short columns. A novel confinement model is formulated for the concrete-core that is effectively confined by the external circular steel tube and the embedded steel section. The modeling scheme of confinement is programmed in the mathematical model that utilizes the fiber element discretization of column cross-sections. The numerical predictions are verified by experimental measurements and results obtained from the finite element analysis, demonstrating the accuracy of the modeling technology. In addition, existing concrete confinement models for concrete in circular Concrete-Filled Steel Tubular (CFST) columns are assessed. The new confinement model is shown to be superior in replicating the responses of SRCFST columns. The influences of design parameters on the column's performance are numerically investigated and the importance order of these parameters is determined by a sensitivity analysis. The study not only examines the validity of current design standards in determining the axial load capacity of SRCFST columns but also proposes a new design formula. The proposed confinement model can be employed in numerical procedures for the inelastic simulation of SRCFST columns and the design formula is suitable for use in practical design.

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轴向荷载下圆形钢筋混凝土填充钢管短柱的数值模拟与设计

本文提出了一种用于确定圆形钢筋混凝土填充钢管（SRCFST）短柱轴向响应的计算模型。针对由外部圆形钢管和预埋钢截面有效约束的混凝土核心部分，制定了一个新颖的约束模型。在数学模型中对约束模型方案进行了编程，利用纤维元件对支柱横截面进行离散化。实验测量结果和有限元分析结果验证了数值预测，证明了建模技术的准确性。此外，还评估了用于圆形混凝土填充钢管 (CFST) 柱中混凝土的现有混凝土约束模型。结果表明，新的约束模型在复制 SRCFST 柱的响应方面更胜一筹。对设计参数对柱性能的影响进行了数值研究，并通过敏感性分析确定了这些参数的重要程度。该研究不仅检验了现行设计标准在确定 SRCFST 柱轴向承载能力方面的有效性，还提出了一种新的设计公式。所提出的约束模型可用于 SRCFST 柱的非弹性模拟数值程序，设计公式也适合用于实际设计。

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.