Hành vi động học của dầm ray hư hỏng dưới tác động của tải trọng di động: Nghiên cứu tham số về đặc tính rạn nứt

Thuy-Duong Le1, Le-Hung Tran2
1\(^1\) Faculty of Civil Engineering, VNU University of Engineering and Technology, 144 Xuan Thuy street, Hanoi, 100000, Vietnam
2\(^2\) EMGCU/MAST, Université Gustave Eiffel, 14-20 boulevard Newton, Champs-sur-Marne, 77420, France

Tóm tắt

Nghiên cứu này điều tra các phản ứng động của các dầm bị nứt đặt trên nền tảng visco-elastic và chịu tác động của tải trọng di động. Sử dụng mô hình dầm Euler–Bernoulli, hành vi của các dầm được xác định, với nhiều vết nứt mở ở một phía với độ sâu khác nhau. Thông qua việc ứng dụng các kỹ thuật biến đổi Fourier và hàm Green, phản ứng động của dầm được xác định một cách phân tích trong miền tần số. Hơn nữa, một mô hình phân tích cho các dầm ray được phát triển bằng cách tích hợp chúng với mô hình dầm được hỗ trợ định kỳ. Mô hình tích hợp này cho phép tính toán hiệu quả hành vi động của các dầm hư hỏng, nơi mà các vết nứt xuất hiện ở các vị trí cụ thể. Ngoài ra, một mô hình tính toán sử dụng phương pháp phần tử hữu hạn được thiết lập và so sánh với mô hình phân tích. Nghiên cứu tham số cho thấy ảnh hưởng của các đặc tính vết nứt đến phản ứng động của dầm.

Từ khóa

#cracked beam #railway sleeper #visco-elastic foundation #Euler–Bernoulli beam

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