Flexural Improvement of RC Slabs by FRP or Steel Using Different Strengthening Systems and Novel Anchoring Techniques

IF 3.6 3区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Mohamed H. Makhlouf, Ibrahim A. El-Azab, M. H. Mansour
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Abstract

An experimental study on reinforced concrete one-way slabs strengthened by various methods and materials is introduced in this paper. Innovative anchorage procedures are presented and evaluated to prevent the strengthening elements with FRP system from de-bonding at the initial stages. Externally bonded embedded in concrete cover (EBECC) strengthening technology was proposed to save the fiber strips from being subjected to heat, degradation, and sabotage. Nine RC one-way slabs, including a control slab and eight strengthened slabs, were cast. One RC slab was strengthened using externally bonded embedded in concrete cover (EBECC), whereas the other tested RC slabs were strengthened using either externally bonded (EB) or near-surface mounted (NSM) procedures. The following test variables are used in this study: the proposed anchors, the area of steel, the kind of material utilized in NSM rods (carbon fiber reinforced polymer (CFRP), glass fiber reinforced polymer (GFRP), and steel), and the strengthening scheme. The ultimate and initial cracking loads, load–deformation response, cracking patterns, and failure behavior were recorded and discussed. Additionally, a comparison of the stiffness, ductility, and energy absorption of the examined slabs was reported. The strengthened slabs by various techniques showed a boost in flexural strength that varied from 67 to 107% compared to the control slab. In addition, RC slabs strengthened by NSM-CFRP bars showed a maximum flexural capacity when compared with slabs strengthened by GFRP and steel bars. Also, the results supported the superiority of a novel end anchorage. The ABAQUS program was employed to conduct a finite element analysis (FEA) employing 3-D geometries to compare and assess the numerical performance of the identical slabs under similar test settings. The results showed good agreement between the experimental and numerical findings.

Abstract Image

使用不同的加固系统和新型锚固技术,用玻璃钢或钢材改善钢筋混凝土板的抗弯性能
本文介绍了采用各种方法和材料加固钢筋混凝土单向板的实验研究。本文提出并评估了创新的锚固程序,以防止使用玻璃钢系统的加固元件在初始阶段脱粘。提出了外部粘结嵌入混凝土覆盖层(EBECC)加固技术,以避免纤维条受热、降解和破坏。共浇筑了九块单向 RC 板,包括一块对照板和八块加固板。其中一块 RC 板采用外部粘结嵌入混凝土盖板(EBECC)加固,而其他测试的 RC 板则采用外部粘结(EB)或近表面安装(NSM)程序加固。本研究使用了以下测试变量:建议的锚固件、钢材面积、NSM 杆件使用的材料类型(碳纤维增强聚合物(CFRP)、玻璃纤维增强聚合物(GFRP)和钢材)以及加固方案。记录并讨论了最终和初始开裂载荷、载荷-变形响应、开裂模式和破坏行为。此外,报告还对受检板的刚度、延展性和能量吸收进行了比较。与对照板相比,采用各种技术加固的板的抗弯强度提高了 67% 到 107%。此外,与使用 GFRP 和钢筋加固的楼板相比,使用 NSM-CFRP 钢筋加固的 RC 板显示出最大的抗弯能力。此外,研究结果还证明了新型端部锚固的优越性。使用 ABAQUS 程序进行有限元分析(FEA),采用三维几何图形来比较和评估相同板材在类似试验设置下的数值性能。结果表明,实验结果与数值结果之间存在良好的一致性。
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来源期刊
International Journal of Concrete Structures and Materials
International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL
CiteScore
6.30
自引率
5.90%
发文量
61
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.
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