EXPERIMENTAL STUDY ON THE FLEXURAL BEHAVIOR OF TRC-STRENGTHENED REINFORCED CONCRETE BEAMS=EXPERIMENTAL STUDY ON THE FLEXURAL BEHAVIOR OF TRC-STRENGTHENED REINFORCED CONCRETE BEAMS

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Tác giả: Viết Chinh Mai, Thị Thu Nga Nguyễn, Trung Kiên Nguyễn, Ngọc Quang Vũ

Ngôn ngữ: eng

Ký hiệu phân loại:

Thông tin xuất bản: Journal of Science and Technique: Section on Special Construction Engineering, 2024

Mô tả vật lý: tr.185

Bộ sưu tập: Metadata

ID: 251753

Thêm vào giỏ

Bài báo trình bày kết quả nghiên cứu thí nghiệm để kiểm chứng khả năng chịu uốn của dầm bê tông cốt thép (BTCT) gia cường bằng vật liệu bê tông cốt lưới dệt (TRC). Bê tông chế tạo cho 4 dầm BTCT là loại B22.5, lớp gia cường TRC sử dụng loại lưới Sigratex Grid 350 và bê tông hạt mịn Sikagrout 214-11 làm chất kết dính. Phương pháp thi công lớp gia cường tạo khía rãnh. Thí nghiệm uốn 4 điểm được tiến hành nhằm đánh giá sự cải thiện khả năng chịu lực và biến dạng của dầm sau khi gia cường. Kết quả cho thấy dầm gia cường có khả năng chịu tải cao hơn 36,2% và tăng 13,5% chuyển vị tại giữa nhịp so với dầm không gia cường. Việc xuất hiện hiện tượng bong tách lớp gia cường làm giảm hiệu quả gia cường. Để đảm bảo tính hiệu quả trong gia cường cho dầm chịu uốn bằng TRC, cần quan tâm nghiên cứu đến khả năng bám dính của lớp bê tông hạt mịn và tăng gia cường thêm vùng bê tông chịu nén. Những kết quả này đóng góp cơ sở cho việc ứng dụng vật liệu TRC trong tăng cường kết cấu BTCT, đảm bảo an toàn và hiệu quả trong sử dụng thực tế.This article presents the experimental results on the flexural behavior of reinforced concrete (RC) beams strengthened with textile-reinforced concrete (TRC). Four RC beams were made of B22.5 grade concrete, and the TRC strengthening layer utilized Sigratex Grid 350 textile, with fine-grained concrete Sikagrout 214-11 serving as the binder. The reinforcement layer was applied using a grooving technique. The four-point bending test was conducted to evaluate the improvements in load-bearing capacity and deformation of the beams after strengthening. The results indicated that the strengthened beams exhibited a 36.2% higher load-bearing capacity and a 13.5% increase in mid-span deflection compared to un-strengthened beams. However, the occurrence of debonding in the reinforcing layer reduced the strengthening effectiveness. To ensure the efficiency of flexural strengthening with TRC, attention should be given to the adhesion of the fine-grained concrete layer and additional reinforcement of the compression zone. These findings provide a basis for the practical application of TRC in enhancing RC structures, ensuring both safety and performance.

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