Abstract

This paper presents experimental and numerical study to investigate the flexural behaviour of strengthened RC beams using three CFRP techniques. Considered main variables were CFRP technique, amount of CFRP NSM and rope and cost/increase in strength effectiveness. Results indicate that using CFRP rope and sheet increased significantly maximum load and maximum strain of RC beams. Average increase in strength and maximum strain were 76.3% to 143.5% and 206% to 246% as the control RC beam. Moreover, RC beams strengthened with CFRP rope exhibited strength approximately similar to ones strengthened with CFRP strip. The cost/increase in strength ratio of specimens strengthened by CFRP rope is 61% higher than the ratio of specimens strengthened by CFRP NSM strip. Hence, the specimens strengthened by one layer of CFRP rope is the most economic techniques based in cost/increase in strength ratio even though it exhibited maximum load less than the specimens strengthened with two layers of CFRP rope or strip. CFRP rope was 40% lower than CFRP strip when same strengthening effect was achieved. Finally, complementary to experimental work a finite element model FEM was developed to investigate the flexural behaviour of beam. The FEA model showed somehow good agreement with the experimental results.

摘要

本文介绍了使用三种 CFRP 技术研究加固 RC 梁的弯曲行为的实验和数值研究。考虑的主要变量是 CFRP 技术、CFRP NSM 和绳索的数量以及强度有效性的成本/增加。结果表明，使用 CFRP 绳索和板材显着增加了 RC 梁的最大载荷和最大应变。作为对照钢筋混凝土梁，强度和最大应变的平均增加分别为 76.3% 至 143.5% 和 206% 至 246%。此外，用 CFRP 绳加固的 RC 梁的强度与用 CFRP 带加固的梁大致相似。CFRP绳索加固试件的成本/强度增加比比CFRP NSM条加固试件的比例高61%。因此，用一层 CFRP 绳加固的试件是基于成本/强度比增加的最经济的技术，尽管它的最大载荷小于用两层 CFRP 绳或带加固的试件。在达到同样的加固效果时，碳纤维布绳比碳纤维布条低 40%。最后，作为实验工作的补充，开发了有限元模型 FEM 来研究梁的弯曲行为。FEA 模型与实验结果在某种程度上表现出良好的一致性。作为实验工作的补充，开发了有限元模型 FEM 来研究梁的弯曲行为。FEA 模型与实验结果在某种程度上表现出良好的一致性。作为实验工作的补充，开发了有限元模型 FEM 来研究梁的弯曲行为。FEA 模型与实验结果在某种程度上表现出良好的一致性。