用小直径玻璃钢条加固的薄层超高强度工程水泥基复合材料（UHS-ECC）用于结构加固

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2024-10-18 DOI:10.1016/j.tws.2024.112592

Ji-Xiang Zhu , Ke-Fan Weng , Wei-He Liu , Bo-Tao Huang , Kai-Di Peng , Ji-Hua Zhu , Jian-Guo Dai

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引用次数: 0

摘要

本研究提出了一种新型钢筋混凝土（RC）结构加固系统，即使用超高强度工程水泥基复合材料（UHS-ECC）薄层和小直径纤维增强聚合物（FRP）条进行加固。通过实验研究、数字图像相关分析和数值模拟，对使用 20 毫米 UHS-ECC 层和 3 毫米 FRP 杆件加固的 RC 梁的抗弯性能和破坏机理进行了评估。结果发现，单独使用 20 毫米的 UHS-ECC 层可将 RC 梁的承载能力提高 8.3%，但挠度有所减小；而使用两根 3 毫米的玻璃钢条可将承载能力提高 40.4%，但挠度没有减小。所有试样的破坏都是由混凝土破碎引起的；然而，玻璃钢加固的 UHS-ECC 层减轻了早期裂缝的局部化，显著提高了强度和延展性。这项研究还表明，与环氧树脂粘结的预制层相比，现浇 FRP 加固 UHS-ECC 层具有更高的承载能力，并能避免 ECC/混凝土界面裂缝。针对该加固系统提出了一个三维有限元模型，并成功预测了其抗弯行为。结果表明，玻璃钢与 UHS-ECC 的粘结对性能的影响微乎其微，而 UHS-ECC 与混凝土界面的粘结则对抗弯行为产生了重大影响。值得注意的是，小直径玻璃钢条在极限阶段达到了其抗拉强度的 75%。这些发现凸显了玻璃钢加固 UHS-ECC 层作为增强 RC 结构力学和耐久性能的有效解决方案的潜力。

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Thin-layer Ultra-High-Strength Engineered Cementitious Composites (UHS-ECC) reinforced with small-diameter FRP bars for structural strengthening

This study proposed a novel strengthening system for reinforced concrete (RC) structures using a thin layer of Ultra-High-Strength Engineered Cementitious Composites (UHS-ECC) reinforced with small-diameter Fiber-Reinforced Polymer (FRP) bars. Experimental investigation, digital image correlation analysis, and numerical simulation were conducted to evaluate the flexural performance and failure mechanism of RC beams strengthened with 20-mm UHS-ECC layers and 3-mm FRP bars. It was found that the 20-mm UHS-ECC layer alone improved the load capacity of RC beams by 8.3 %, though with reduced deflection, whereas incorporating two 3-mm FRP bars increased load capacity by up to 40.4 %, without sacrificing deflection. Failure in all specimens was caused by concrete crushing; however, FRP-reinforced UHS-ECC layers mitigated early crack localization, significantly enhancing both strength and ductility. This study also revealed that cast-in-place FRP-reinforced UHS-ECC layers exhibited higher load capacity and could avoid ECC/concrete interfacial cracks compared to epoxy-bonded prefabricated layers. A three-dimensional finite element model was proposed for the strengthening system, and the flexural behavior was successfully predicted. It is revealed that the FRP-to-UHS-ECC bond had a marginal influence on performance, while the bond at the UHS-ECC-to-concrete interface significantly impacted flexural behavior. Remarkably, the small-diameter FRP bar achieved 75 % of its tensile strength at the ultimate stage. These findings underscore the potential of FRP-reinforced UHS-ECC layers as an effective solution for enhancing the mechanical and durability performance of RC structures.

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.