Nghiên cứu thực nghiệm ứng xử dầm bê tông cốt thép chịu uốn bị hư hỏng do ăn mòn được gia cường bằng tấm CFRP

BỘ GIÁO DỤC VÀ ĐÀO TẠO TRƯỜNG ĐẠI HỌC XÂY DỰNG HÀ NỘI NGHIÊN CỨU THỰC NGHIỆM ỨNG XỬ DẦM BÊ TÔNG CỐT THÉP CHỊU UỐN BỊ HƯ HỎNG DO ĂN MÒN ĐƯỢC GIA CƯỜNG BẰNG TẤM CFRP Chuyên ngành: Kỹ thuật xây dựng Mã ngành: 9580201 LUẬN ÁN TIẾN SĨ Hà Nội – Năm 2022 BỘ GIÁO DỤC VÀ ĐÀO TẠO TRƯỜNG ĐẠI HỌC XÂY DỰNG HÀ NỘI NGHIÊN CỨU THỰC NGHIỆM ỨNG XỬ DẦM BÊ TÔNG CỐT THÉP CHỊU UỐN BỊ HƯ HỎNG DO ĂN MÒN ĐƯỢC GIA CƯỜNG BẰNG TẤM CFRP Chuyên ngành: Kỹ thuật xây dựng Mã ngành: 9580201 Người hướng dẫn khoa học: Hà Nội – Năm 2022 i LỜI CAM ĐOAN Tôi xin cam đoan luận án cơng trình nghiên cứu tơi hướng dẫn cán hướng dẫn Những số liệu kết trình bày luận án trung thực chưa công bố cơng trình khác Tác giả ii LỜI CẢM ƠN Trước hết, xin bày tỏ lời cảm ơn sâu sắc đến thầy hướng dẫn khoa học PGS TS Nguyễn Hoàng Giang PGS TS ln tận tình hướng dẫn giúp đỡ suốt q trình thực luận án Tơi xin gửi lời cảm ơn chân thành đến thầy cô giáo kỹ thuật viên Bộ mơn Thí nghiệm Kiểm định cơng trình, Trường Đại học Xây dựng Hà Nội, giúp đỡ tơi q trình thực công việc thực nghiệm Tôi chân thành cảm ơn thầy Khoa Xây dựng DD&CN, Phịng Quản lý đào tạo, nhà khoa học Trường Đại học Xây dựng Hà Nội trường Đại học kỹ thuật lĩnh vực xây dựng đưa nhiều góp ý giúp tơi hồn thiện nội dung luận án Tôi chân thành cảm ơn Cục Giám định nhà nước chất lượng cơng trình, Cục Cơng tác phía Nam, Bộ Xây dựng, tạo điều kiện thuận lợi để tơi hồn thành nhiệm vụ nghiên cứu Cuối cùng, xin bày tỏ lời cảm ơn sâu sắc đến bố mẹ, vợ bạn bè, đồng nghiệp ủng hộ tinh thần động viên tơi vượt qua khó khăn học tập, nghiên cứu đề hoàn thành luận án iii MỤC LỤC LỜI CAM ĐOAN i LỜI CẢM ƠN DANH MỤC CÁC KÝ HIỆU VÀ CHỮ VIẾT TẮT ii vii DANH MỤC BẢNG BIỂU ix DANH MỤC HÌNH VẼ xi MỞ ĐẦU 1 Lý chọn đề tài Mục đích nghiên cứu 3 Đối tượng phạm vi nghiên cứu Cơ sở khoa học Phương pháp nghiên cứu Ý nghĩa khoa học thực tiễn luận án Những đóng góp luận án Nội dung cấu trúc luận án CHƯƠNG – NGHIÊN CỨU TỔNG QUAN VỀ KẾT CẤU DẦM BÊ TƠNG CỐT THÉP BỊ ĂN MỊN TRONG MƠI TRƯỜNG BIỂN 1 Tổng quan ăn mòn cốt thép kết cấu cơng trình 111 Cơ chế ăn mòn cốt thép 112 Các giai đoạn trình ăn mịn cốt thép 10 113 Những ngun nhân gây ăn mịn cốt thép 11 Tổng quan ứng xử uốn kết cấu dầm BTCT bị ăn mòn 18 121 Trên giới 18 122 Ở Việt Nam 22 Tổng quan sửa chữa gia cường kết cấu BTCT bị ăn mòn 29 Các phương pháp sửa chữa gia cường kết cấu BTCT bị ăn mòn 29 132 Cấu tạo vật liệu FRP 33 iv 3 Các đặc điểm vật liệu FRP 35 Tình hình nghiên cứu gia cường kết cấu BTCT sợi FRP 39 Kết luận Chương CHƯƠNG – NGHIÊN CỨU THỰC NGHIỆM ỨNG XỬ UỐN CỦA KẾT CẤU DẦM BÊ TÔNG CỐT THÉP BỊ ĂN MÒN 50 52 Thiết lập mơ hình thí nghiệm gia tốc ăn mịn cốt thép 52 211 Mục đích thí nghiệm 52 212 Nguyên lý thí nghiệm 52 213 Mơ hình thí nghiệm 53 214 Quy trình thí nghiệm 54 2 Thí nghiệm gia tốc ăn mòn cốt thép mẫu thử 55 221 Vật liệu sử dụng 56 222 Mẫu thử 58 2 Áp dụng mơ hình thí nghiệm gia tốc ăn mòn cốt thép 59 224 Kết thực nghiệm mẫu thử 225 Xác định hệ số hiệu chỉnh định luật Faraday mẫu thử BTCT 60 64 Thí nghiệm gia tốc ăn mòn cốt thép mẫu dầm BTCT 66 231 Vật liệu sử dụng 66 232 Mẫu dầm thí nghiệm 67 233 Áp dụng mơ hình thí nghiệm gia tốc ăn mòn cốt thép 68 Xác định mức độ ăn mòn cốt thép 69 Thực nghiệm ứng xử uốn kết cấu dầm BTCT bị ăn mịn 72 241 Mục đích thí nghiệm 72 242 Sơ đồ thí nghiệm 72 243 Quan hệ tải trọng độ võng 73 v 324 BTCT Phân tích ảnh hưởng ăn mòn cốt thép dọc đến ứng xử uốn dầm 77 Sơ đồ vết nứt bê tông dầm BTCT 251 Sơ đồ vết nứt bê tơng ăn mịn 252 Sơ đồ vết nứt bê tông tải trọng 85 Kết luận Chương 90 CHƯƠNG – NGHIÊN CỨU THỰC NGHIỆM GIA CƯỜNG CHỊU UỐN KẾT CẤU DẦM BÊ TÔNG CỐT THÉP BỊ ĂN MÒN BẰNG TẤM CFRP 92 Thực nghiệm gia cường chịu uốn dầm BTCT bị ăn mòn 92 1 Vật liệu sử dụng 92 Mẫu dầm gia cường 95 3 Quy trình gia cường chịu uốn dầm ăn mòn sợi CFRP 98 Thực nghiệm ứng xử uốn dầm ăn mòn gia cường 102 Mục đích thí nghiệm 102 2 Sơ đồ thí nghiệm 103 3 Quan hệ tải trọng độ võng 104 3 Phân tích kết thực nghiệm 107 3 Khả chịu lực dầm ăn mòn gia cường 107 3 Độ võng dầm 108 3 Dạng phá hoại 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DẦM BÊ TƠNG CỐT THÉP BỊ ĂN MỊN BẰNG TẤM CFRP 92 Thực nghiệm gia cường chịu uốn dầm BTCT bị ăn mòn 92 1 Vật liệu sử dụng 92 Mẫu dầm gia cường 95 3 Quy trình gia cường chịu uốn dầm ăn mòn sợi CFRP. .. cấu dầm bê tơng cốt thép bị ăn mịn mơi trường biển Chương 2: Trình bày nghiên cứu thực nghiệm ứng xử uốn kết cấu dầm bê tơng cốt thép bị ăn mịn Chương 3: Trình bày nghiên cứu thực nghiệm gia cường. .. bền vững gia tăng tuổi thọ cơng trình Vì vậy, đề tài ? ?Nghiên cứu thực nghiệm ứng xử dầm bê tông cốt thép chịu uốn bị hư hỏng ăn mòn gia cường CFRP? ?? đề xuất thực luận án Mục đích nghiên cứu Những