GFRP筋与无抗剪主筋中钢筋混合加固混凝土梁的抗剪强度

IF 1.1 Q4 MECHANICS Curved and Layered Structures Pub Date : 2022-01-01 DOI:10.1515/cls-2022-0013
A. Shoeib, Ahmed Arafa, A. E. Sedawy, Awad M. EL-Hashmy
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引用次数: 1

摘要

摘要钢筋混凝土构件在施工过程中的结构性能研究已成为GFRP钢筋与钢筋混合的关键问题。钢筋混凝土梁的极限混凝土抗剪强度是既有GFRP筋又有主筋中钢筋的一项主要工作。本文研究了钢筋混凝土(RC)结构中纤维增强聚合物(FRP)钢筋与钢筋共用对RC梁混凝土抗剪强度的影响。建造了14根没有抗剪钢筋的钢筋混凝土梁,并进行了破坏测试。试验梁包括两个钢筋混凝土梁、一个GFRP-RC梁、11个钢筋和GFRP钢筋(GFRP/钢混合)-RC梁。主要参数为配筋率、剪跨深比、梁的深度、混凝土抗压强度和抗压钢筋。试验结果从裂纹模式、失效模式、载荷偏转和载荷应变行为等方面给出。试验结果表明,在试验梁中,与主筋中只有一根钢筋相比,GFRP/钢筋混合后的延性显著提高,变形减少。传力杆作用可以在梁中传递剪切力的过程中发挥重要作用。最后,计算混合配筋构件抗剪强度的初始建议方程可以作为在RC梁的主筋处引入混合钢筋(GFRP和钢)的指南。
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The shear strength of concrete beams hybrid-reinforced with GFRP bars and steel bars in main reinforcement without shear reinforcement
Abstract The investigation of the structural performance of reinforced concrete members in the construction process has become a critical issue for Hybrid GFRP bars with steel bars. The ultimate concrete shear strength of reinforced concrete beams contains both GFRP bars and Steel bars in main reinforcement are a main task of work. This paper examines the effect of sharing the fiber-reinforced polymer (FRP) bars with steel bars for reinforced concrete (RC) structures on the concrete shear strength of RC beams. Fourteen RC beams without shear reinforcement were constructed and tested up to failure. The test beams included two steel-RC beams, one GFRP-RC beam, and eleven steel bars and GFRP bars (hybrid GFRP/steel)-RC beams. The main parameters were the reinforcement ratio, shear span to depth ratio, depth of the beam, concrete compressive strength, and compression reinforcement. The test results are presented in terms of crack patterns, failure modes, load-deflection, and load-strain behavior. The test results showed that hybrid GFRP/steel bars causing significant improvement in the ductility with reduction of the deformation comparing with an only steel bar in main steel in tested beams. The dowel action can play a major role in the process by which shear is carried in a beam. Finally, the initial proposal equation that calculates the shear strength of hybrid reinforced elements can serve as a guideline for the introduction of hybrid bars (GFRP and Steel) at the main reinforcement in RC beams.
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来源期刊
CiteScore
2.60
自引率
13.30%
发文量
25
审稿时长
14 weeks
期刊介绍: The aim of Curved and Layered Structures is to become a premier source of knowledge and a worldwide-recognized platform of research and knowledge exchange for scientists of different disciplinary origins and backgrounds (e.g., civil, mechanical, marine, aerospace engineers and architects). The journal publishes research papers from a broad range of topics and approaches including structural mechanics, computational mechanics, engineering structures, architectural design, wind engineering, aerospace engineering, naval engineering, structural stability, structural dynamics, structural stability/reliability, experimental modeling and smart structures. Therefore, the Journal accepts both theoretical and applied contributions in all subfields of structural mechanics as long as they contribute in a broad sense to the core theme.
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