碳纤维增强塑料条与超高性能混凝土层配筋钢筋混凝土梁的抗弯承载力研究

IF 2.1 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

International Journal of Building Pathology and Adaptation Pub Date : 2022-08-22 DOI:10.1108/ijbpa-04-2022-0056

Long Liu, Songqiang Wan

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引用次数: 2

摘要

目的充分利用粘贴碳纤维增强塑料（CFRP）的近表面粘贴（NSM）带的抗拉强度，进一步提高钢筋混凝土（RC）梁的抗弯承载力和柔性，在钢筋混凝土梁受拉区嵌入碳纤维布的基础上，提出了一种在钢筋混凝土受压区采用超高性能混凝土（UHPC）层的新型复合加固方法。本文旨在讨论上述几点。设计/方法/方法利用ABAQUS对实验梁进行了模拟，并与实验结果进行了比较，验证了有限元模型的有效性。在此基础上，采用钢筋混凝土梁作为控制梁，通过验证模型研究了CFRP条数、UHPC层厚、钢筋率和混凝土强度等参数。此外，还给出了屈服强度、极限强度、破坏挠度和柔性的数值计算结果。结果：新方法支撑的RC梁的抗弯承载力比无筋梁高132.3%，比仅用CFRP条支撑的RC梁高7.8%。新型钢筋混凝土梁的挠度柔性系数为8.06，高于无筋梁和仅在受拉区嵌入CFRP带的钢筋混凝土梁。独创性/价值本文提出了一种新的加固方法，并通过有限元数值模拟分析了各种参数对钢筋混凝土梁极限承载力和柔性的影响。最后，通过分析公式验证了新方法的有效性。

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Flexural bearing capacity of reinforced concrete beams reinforced with carbon fiber reinforced plastics strips and ultra-high performance concrete layers

PurposeTo 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/approachThe 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.FindingsThe 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/valueIn 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.

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来源期刊

International Journal of Building Pathology and Adaptation CONSTRUCTION & BUILDING TECHNOLOGY-

CiteScore

4.80

自引率

18.20%

发文量

期刊介绍： The International Journal of Building Pathology and Adaptation publishes findings on contemporary and original research towards sustaining, maintaining and managing existing buildings. The journal provides an interdisciplinary approach to the study of buildings, their performance and adaptation in order to develop appropriate technical and management solutions. This requires an holistic understanding of the complex interactions between the materials, components, occupants, design and environment, demanding the application and development of methodologies for diagnosis, prognosis and treatment in this multidisciplinary area. With rapid technological developments, a changing climate and more extreme weather, coupled with developing societal demands, the challenges to the professions responsible are complex and varied; solutions need to be rigorously researched and tested to navigate the dynamic context in which today''s buildings are to be sustained. Within this context, the scope and coverage of the journal incorporates the following indicative topics: • Behavioural and human responses • Building defects and prognosis • Building adaptation and retrofit • Building conservation and restoration • Building Information Modelling (BIM) • Building and planning regulations and legislation • Building technology • Conflict avoidance, management and disputes resolution • Digital information and communication technologies • Education and training • Environmental performance • Energy management • Health, safety and welfare issues • Healthy enclosures • Innovations and innovative technologies • Law and practice of dilapidation • Maintenance and refurbishment • Materials testing • Policy formulation and development • Project management • Resilience • Structural considerations • Surveying methodologies and techniques • Sustainability and climate change • Valuation and financial investment