Bending bearing behavior of embedded thin-walled steel tube reinforced concrete beams

IF 7.1 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2025-09-25 DOI:10.1016/j.compstruct.2025.119700

Qiang Fu , Xiaopeng Hu , Ditao Niu , Tongwen yang

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引用次数: 0

Abstract

This study integrates the concepts of box girders and composite structures to propose a novel Embedded Thin-walled Steel Tube Reinforced Concrete (ESTRC) beam, which improves the mechanical properties and lightweight characteristics of traditional reinforced concrete (RC) beams. The research uses closed-section thin-walled steel tubes as the core configuration. After welding shear studs, it effectively suppresses interfacial slippage and reduces stress concentration. Experimental results show that compared with RC beams, the self-weight of ESTRC beams is reduced by 15%–18%, the flexural bearing capacity is increased by up to 111.11%, and the ductility coefficient reaches 6.63. Through four-point bending tests and finite element simulations, eight specimens were tested to investigate the influence of the height of the steel tube (h_a), wall thickness (t_w), and the vertical distance from the bottom of the steel tube to the bottom of the beam (h₁) on the beam’s performance. The results indicate that increasing h_a, t_w, or decreasing h₁ can enhance the bearing capacity, but their effects on ductility vary. Based on the experimental data, a two-factor flexural calculation method for ESTRC beams is established, considering the influence of the steel tube buckling reduction coefficient (χ) and the degree of yield, significantly improving the calculation accuracy.

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预埋薄壁钢管钢筋混凝土梁的弯曲承载性能

本研究结合箱梁和组合结构的概念，提出了一种新型的预埋薄壁钢管混凝土（ESTRC）梁，提高了传统钢筋混凝土（RC）梁的力学性能和轻量化特性。本研究采用闭截面薄壁钢管作为核心结构。焊接剪切螺柱后，有效抑制界面滑移，降低应力集中。试验结果表明，与RC梁相比，ESTRC梁自重降低15% ~ 18%，抗弯承载力提高111.11%，延性系数达到6.63。通过四点弯曲试验和有限元模拟，对8个试件进行了试验，研究了钢管高度（ha）、壁厚（tw）和钢管底部到梁底部的垂直距离（h1）对梁性能的影响。结果表明，增大ha、tw和减小h1均能提高承载力，但对延性的影响不同。在试验数据的基础上，建立了考虑钢管屈曲折减系数（χ）和屈服程度影响的ESTRC梁双因素受弯计算方法，显著提高了计算精度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.