Hybrid strengthening of RC beams with externally bonded carbon fiber reinforced polymer laminate and engineered cementitious composites transition layer

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS

ACS Applied Bio Materials Pub Date : 2024-05-22 DOI:10.1177/13694332241255748

Yanli Su, Chang Wu, Guolin Wang, Jiaqi Shang, Pu Zhang

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引用次数: 0

Abstract

This paper presents the experimental study on the reinforced concrete (RC) beam strengthened with externally bonded carbon fiber reinforced polymer (EB-CFRP) laminate and engineered cementitious composites (ECC) material. A total of six beams were tested under the four-point bending test to investigate the influence of strengthening scheme, type of CFRP laminate and the width of CFRP plate on the flexural response. The results revealed that hybrid strengthened beam with the technical of EB-CFRP and ECC transition layer significantly enhanced the crack load (29.0%–133.3%), yield load (50.9%–96.5%) and ultimate load (50.0%–81.9%) of the beams relative to the control beam. The employment of ECC material was an ideal transition layer for delaying the interfacial debonding of CFRP laminate, where the ultimate tensile strain of CFRP plate in hybrid strengthened beams was 13.2%–33.33% higher than that of beam merely strengthened with EB-CFRP plate. Beams strengthened with CFRP sheet had the greater flexural performance and higher utilization of CFRP than its counterparts strengthened with CFRP plate. Moreover, the predicted model associated with ultimate bearing capacity of the hybrid beams was provided based on ACI 440.2R-08, which was relatively conservative with a margin for the ultimate load of the hybrid strengthened beams.

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用外部粘接碳纤维增强聚合物层压板和工程水泥基复合材料过渡层混合加固 RC 梁

本文介绍了使用外部粘结碳纤维增强聚合物（EB-CFRP）层压板和工程水泥基复合材料（ECC）对钢筋混凝土（RC）梁进行加固的实验研究。共对六根梁进行了四点弯曲试验，以研究加固方案、碳纤维增强聚合物层压板类型和碳纤维增强聚合物板宽度对弯曲响应的影响。结果表明，与对照梁相比，采用 EB-CFRP 和 ECC 过渡层技术的混合加固梁可显著提高梁的裂缝荷载（29.0%-133.3%）、屈服荷载（50.9%-96.5%）和极限荷载（50.0%-81.9%）。混合加固梁中 CFRP 板的极限拉伸应变比仅使用 EB-CFRP 板加固的梁高 13.2%-33.33%。与使用 CFRP 板加固的梁相比，使用 CFRP 板加固的梁具有更高的抗弯性能和 CFRP 利用率。此外，与混合梁极限承载力相关的预测模型是根据 ACI 440.2R-08 提供的，该模型对混合加固梁的极限荷载留有余地，相对保守。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Applied Bio Materials Chemistry-Chemistry (all)

CiteScore

9.40

自引率

2.10%

发文量

464