Experimental flexural investigation of RC beams with impeded steel truss using smooth steel angels

IF 3.9 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Materials and Structures Pub Date : 2024-06-11 DOI:10.1617/s11527-024-02389-9

Eslam A. Lofty, Ismail M. Kamal, Khaled Mostafa Hassan, Mostafa A. Hassan

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Abstract

This paper emphasizes on testing the flexural capacity of Hybrid Steel Truss Reinforced Concrete Beam (HSTRCB), where a prefabricated steel truss is embedded into concrete beam instead of conventional rebars, forming a composite section. Five doubly reinforced concrete beams were designed, casted, experimentally tested and analyzed to investigate the flexural behavior of HSTRCB, in comparison to ordinary reinforced concrete beam. All beams were designed according to ACI 318, having same flexural capacity. First beam is ordinary reinforced concrete beam while the other four HSTRCB were designed having identical smooth steel angles, as compression and tension reinforcement, with different shear reinforcement alignment, and spacing. Different smooth truss typology were used as reinforced rebar replacement in the RC beams to determine the significant truss configuration that has highest flexural behaviour. The results showed that HSTRCB improves cracking moment, stiffness, energy absorption and effective cracked moment of inertia during the entire loading stages.

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使用光滑钢角对带有受阻钢桁架的 RC 梁进行试验性抗弯研究

本文重点测试了混合钢桁架加固混凝土梁（HSTRCB）的抗弯能力，即在混凝土梁中嵌入预制钢桁架，而不是传统的钢筋，形成一个复合截面。为了研究 HSTRCB 与普通钢筋混凝土梁相比的抗弯行为，我们设计、浇注、实验测试并分析了五根双层钢筋混凝土梁。所有梁都是根据 ACI 318 设计的，具有相同的抗弯能力。第一根梁是普通钢筋混凝土梁，而其他四根 HSTRCB 的设计采用了相同的光滑角钢作为受压和受拉钢筋，但剪力钢筋的排列和间距有所不同。在钢筋混凝土梁中使用不同的光滑桁架类型替代钢筋，以确定抗弯性能最高的重要桁架配置。结果表明，在整个加载阶段，HSTRCB 可改善开裂力矩、刚度、能量吸收和有效开裂惯性矩。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.