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Hiệu suất chịu cắt mỏi của dầm bê tông được gia cường bằng thanh thép và thanh polymer gia cường sợi thủy tinh
Tóm tắt
Các dầm bê tông gia cường bao gồm cả thanh thép và thanh polymer gia cường sợi thủy tinh cho thấy sức mạnh, khả năng phục vụ và độ bền tuyệt vời. Tuy nhiên, hiệu suất chịu cắt mỏi của những dầm này vẫn chưa rõ ràng. Do đó, các dầm với các thanh dọc và kích thước cắt hỗn hợp đã được thiết kế và thực hiện các thử nghiệm chịu cắt mỏi. Đối với các mẫu nghiệm thất bại do chịu cắt mỏi, tất cả các kích thước cắt bằng polymer gia cường sợi thủy tinh và một số kích thước cắt bằng thép đã bị gãy tại vết nứt chéo quan trọng. Đối với mẫu nghiệm thất bại qua thử nghiệm tĩnh sau 8 triệu chu kỳ mỏi, khả năng tĩnh sau mỏi không giảm đáng kể so với giá trị tính toán. Mức độ mỏi ban đầu có ảnh hưởng lớn hơn đến sự phát triển vết nứt và tuổi thọ mỏi hơn là mức độ mỏi trong giai đoạn sau. Sức chịu cắt mỏi của các kích thước cắt bằng polymer gia cường sợi thủy tinh trong các mẫu nghiệm có phần thấp hơn so với các thử nghiệm căng trục dọc trên thanh polymer gia cường sợi thủy tinh ở không khí và các thử nghiệm hàn nối trên thanh polymer gia cường sợi thủy tinh, và các chế độ thất bại là khác nhau. Các kích thước cắt bằng polymer gia cường sợi thủy tinh đã chịu tải mỏi và cắt, và thất bại do cắt.
Từ khóa
#dầm bê tông #polymer gia cường sợi thủy tinh #chịu cắt mỏi #sức chịu cắt #thí nghiệm mỏiTài liệu tham khảo
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