Nghiên cứu thực nghiệm và phân tích về hiệu suất uốn của dầm RC bị ăn mòn bằng mô hình ăn mòn dựa trên RBSM=Experimental and analytical investigations on flexural performance of corroded rc beams using rbsm-based corrosion model

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Tác giả: Anh Duc Mai, Cong Luyen Nguyen, Hong An Nguyen

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Đà Nẵng, 2024

Mô tả vật lý: tr.35-40

Bộ sưu tập: Metadata

ID: 477822

Thêm vào giỏ

Cường độ còn lại và hiệu suất kết cấu của các kết cấu bê tông cốt thép (RC) chịu ăn mòn cốt thép cần được đánh giá chính xác để có quy trình phục hồi hiệu quả. Tuy nhiên, hiệu suất của các kết cấu xuống cấp không thể được xác định bằng cách sử dụng các phương pháp thiết kế vì các điều kiện hư hỏng khác nhau ở mỗi loại kết cấu do mức độ ăn mòn, vị trí ăn mòn, điều kiện môi trường. Nghiên cứu này trước tiên trình bày một cuộc điều tra thực nghiệm về hiệu suất uốn của dầm RC chịu ăn mòn cốt thép. Để bổ sung cho dữ liệu thử nghiệm, một mô hình ăn mòn phân tích do các tác giả phát triển dựa trên Phương pháp lò xo vật rắn (RBSM) đã được sử dụng. Các kết quả thu được từ cả mô hình phân tích và thực nghiệm đều xác nhận rằng dầm bị ăn mòn dường như có độ cứng uốn thấp hơn đáng kể và khả năng uốn thấp hơn so với dầm âm thanh. Mô hình ăn mòn được phát triển có thể nắm bắt được đường cong tải trọng-biến dạng của các kết quả thực nghiệm với sự phù hợp tốt.Residual strength and structural performance of reinforced concrete (RC) structures subjected to rebar corrosion need to be precisely evaluated for an efficient rehabilitation process. However, the performance of deteriorated structures cannot be specified by using design methods since the damaged conditions are different in each type of structures due to corrosion degree, corrosion position, environmental condition. This study first presents an experimental investigation on the flexural performance of RC beam subjected to rebar corrosion. To complement the test data, an analytical corrosion model developed by the authors, which is based on Rigid Body Spring Method (RBSM), was employed. The results obtained from both analytical model and experiment confirmed that the corroded beam appeared to obtain a significantly lower bending stiffness and lower flexural capacity than those of the sound beam. The developed corrosion model can be able to capture the load-displacement curve of experimental results with good agreement.

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