Nghiên cứu xây dựng mô hình phân tích dự đoán ứng xử chịu uốn của dầm bê tông cốt thép=Development of analytical model for predicting the flexural behaviour of rc beams

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Tác giả: Anh Đức Mai, Văn Huy Ngô, Công Luyến Nguyễn, Phú Trung Phạm, Trọng Huy Thân

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học công nghệ xây dựng (Đại học Xây dựng Hà Nội), 2024

Mô tả vật lý: tr.128-137

Bộ sưu tập: Metadata

ID: 237881

Thêm vào giỏ

Nghiên cứu này trình bày sự phát triển mô hình phân tích dự đoán ứng xử chịu uốn của dầm bê tông cốt thép dựa trên lý thuyết tương thích biến dạng và cân bằng lực, có xét đến sự thay đổi độ cứng của dầm khi bê tông vùng kéo ở mặt dưới dầm bị nứt. Mô hình được kiểm chứng với kết quả thực nghiệm của dầm chịu uốn bốn điểm thu thập từ các bài báo của các tác giả khác nhau. Khả năng chịu lực của dầm bê tông cốt thép có được từ mô hình phân tích trong bài báo này cũng được so sánh với kết quả từ mô hình lý thuyết dẻo cứng vốn thiên về an toàn và được sử dụng trong các tiêu chuẩn thiết kế. Kết quả kiểm chứng cho thấy rằng mô hình phân tích có thể dự đoán chính xác khả năng chịu uốn và độ võng của dầm bê tông cốt thép, và cao hơn 4% so với kết quả từ mô hình dẻo cứng.This study proposes an analytical model to predict the flexural behaviour of reinforced concrete (RC) beams based on the strain compatibility theory and force equilibrium, in which the degradation of beam’s stiffness was taken into account as the tensile strain of concrete at below beam’s interface exceeded its capacity. The developed analytical model was then validated with the experimental results conducted by various researchers. The flexural capacity of RC beam retrieved from the developed analytical model was also compared with that obtained by rigid plastic analysis which is a conservative method and currently being adopted in the domestic and international design standards. Validation results showed that the developed analytical model is capable of accurately predicting the flexural strength and displacement of RC beams, and is higher 4% than that obtained by rigid plastic analysis.

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