Liu, L and Wan, S (2024) Flexural bearing capacity of reinforced concrete beams reinforced with carbon fiber reinforced plastics strips and ultra-high performance concrete layers. International Journal of Building Pathology and Adaptation, 42(6), pp. 1126-1146. ISSN 2398-4708
Abstract
Purpose: To make full use of the tensile strength of near surface mounting (NSM) pasted carbon fiber reinforced plastics (CFRP) strips and further increase the flexural bearing capacity and flexibility of reinforced concrete (RC) beams, a new composite reinforcement method using ultra-high performance concrete (UHPC) layer in the compression zone of RC beams is submitted based on embedding CFRP strips in the tension zone of RC beams. This paper aims to discuss the aforementioned points. Design/methodology/approach: The experimental beam was simulated by ABAQUS, and compared with the experimental results, the validity of the finite element model was verified. On this basis, the reinforced RC beam is used as the control beam, and parameters such as the CFRP strip number, UHPC layer thickness, steel bar ratio and concrete strength are studied through the verified model. In addition, the numerical calculation results of yield strength, ultimate strength, failure deflection and flexibility are also given. Findings: The flexural bearing capacity of RC beams supported by the new method is 132.3% higher than that of unreinforced beams, and 7.8% higher than that of RC beams supported only with CFRP strips. The deflection flexibility coefficient of the new reinforced RC beam is 8.06, which is higher than that of the unreinforced beam and the reinforced concrete beam with only CFRP strips embedded in the tension zone. Originality/value: In this paper, a new reinforcement method is submitted, and the effects of various parameters on the ultimate bearing capacity and flexibility of reinforced RC beams are analyzed by the finite element numerical simulation. Finally, the effectiveness of the new method is verified by the analytical formula.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CFRP strips; finite element model; flexural bearing capacity; strengthening; uhpc |
| Index terms: | composite, reinforced concrete beam, carbon fibre, plastic, numerical simulation, validity, reinforcement, beam, high-performance concrete, effectiveness, thickness, compression, methodology, strengthening, reinforced concrete, tensile strength |
| Subjects: | materials science, evaluation and assessment methods, structural engineering, research methods, modelling and simulation, building materials, material properties and characteristics, performance management |
| Topics: | Research Practice, Construction Materials, Quality Management, Engineering Principles |
| Descriptive scope: | 4 PCTA |
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