Study on Crack Resistance and Calculation Model of RAC Beams Strengthened with Prestressed CFRP

IF 3.6 3区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY International Journal of Concrete Structures and Materials Pub Date : 2024-01-04 DOI:10.1186/s40069-023-00638-9

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Abstract

With the development of recycled aggregate concrete (RAC), the recovery rate of construction waste is improved, and the pollution problem is alleviated. In particular, RAC beams strengthened with prestressed carbon fiber reinforced plastics (CFRP) can exhibit improved mechanical properties, expanding RAC application. Four groups of reinforced RAC beam specimens contained 0%, 40%, 70%, and 100% recycled coarse aggregate, respectively. Each group of beams was first pre-cracked and then strengthened by prestressed CFRP with one layer and two layers respectively. Finally, the bearing capacity tests were performed for these beams. The test results show that as the recycled coarse aggregate content increases, the cracking moment and ultimate load capacity of the beam decrease, while its crack width increases. As the CFRP layer increases, the deformation and crack width of the beam decreases, while the number of cracks increases. The prestressed CFRP also exhibited tensile and peeling failure. A beam deflection calculation model was established by introducing a coefficient k representing the interaction between recycled aggregate and CFRP. The influence coefficient of concrete elongation on the crack width and average crack spacing of the beam was modified, and the crack width analysis model of the beam was established. The calculated results are in good agreement with the experimental observations. It can provide reference for the application and design of recycled concrete beams strengthened with prestressed CFRP.

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使用预应力 CFRP 加固的 RAC 梁的抗裂性和计算模型研究

摘要随着再生骨料混凝土（RAC）的发展，提高了建筑垃圾的回收率，缓解了污染问题。尤其是采用预应力碳纤维增强塑料（CFRP）加固的 RAC 梁，可以改善力学性能，扩大 RAC 的应用范围。四组加固的 RAC 梁试样分别含有 0%、40%、70% 和 100% 的再生粗骨料。每组梁首先进行预裂，然后分别用一层和两层预应力 CFRP 进行加固。最后，对这些梁进行了承载能力测试。试验结果表明，随着再生粗集料含量的增加，梁的开裂力矩和极限承载力降低，而裂缝宽度增加。随着 CFRP 层的增加，梁的变形和裂缝宽度减小，而裂缝数量增加。预应力 CFRP 还表现出拉伸和剥离失效。通过引入代表再生骨料和 CFRP 之间相互作用的系数 k，建立了梁挠度计算模型。修改了混凝土伸长率对梁的裂缝宽度和平均裂缝间距的影响系数，建立了梁的裂缝宽度分析模型。计算结果与实验结果吻合良好。它可为采用预应力 CFRP 加固的再生混凝土梁的应用和设计提供参考。

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来源期刊

International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL

CiteScore

6.30

自引率

5.90%

发文量

审稿时长

13 weeks

期刊介绍： The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.