Dự báo ứng xử chịu cắt của bê tông cốt sợi thép có xét đến ảnh hưởng của định hướng sợi bằng phương pháp giải tích=Prediction of shear behavior of steel fiber-reinforced concrete with consideration of the effects of fiber orientation through analytical methods

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Tác giả: Chí Công Vũ

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.54-65

Bộ sưu tập: Metadata

ID: 225455

Thêm vào giỏ

Ảnh hưởng của định hướng sợi thép tới tác dụng gia cường bê tông ở nhiều trạng thái nứt khác nhau là rất đáng kể tuy nhiên thường khó định lượng. Bài báo này trình bày một nghiên cứu lý thuyết, giải thích cơ chế hoạt động của sợi dưới chuyển động mở rộng và trượt kết hợp của vết nứt thông qua phương pháp giải tích. Phương pháp này cho phép ước lượng ứng suất pháp và ứng suất tiếp tại vết nứt có độ mở rộng và độ trượt cụ thể. Hàm giải tích của những ứng suất liên kết này là tổ hợp tuyến tính của các ứng suất liên kết của sợi và ứng suất liên kết của bê tông tương ứng. Phân bố của định hướng sợi được tham số hóa bằng hàm thống kê hai biến. Sự biến thiên của mô hình được định lượng bằng một số mô phỏng trên các tham số vật liệu quan trọng. Kết quả của mô phỏng thí nghiệm cắt trực tiếp cho thấy ước lượng của phương pháp là tương đối tốt và có nhiều tiềm năng phát triển.The effect of orientation on the fiber bridging mechanism in various cracking states of Steel-Fiber-Reinforced Concrete (SFRC) is important but also difficult to quantify. This paper presents an analytical method for interpreting the fiber bridging mechanism under the combination of crack opening and crack sliding. The model allows for the estimation of cohesive stresses at a given crack size. Their analytic formulas are a linear combination of fiber bridging stress and aggregate interlocking stress. The distribution of the fiber orientation is presented as a probability density function of two variables. The accuracy of the model is then quantified by the numerical simulation of a direct shear experiment. A parametric study on some important parameters is performed to evaluate the variation of the model. The results show a good agreement between the numerical estimation of the proposed model and the experimental results. Moreover, the parametrical study presents a reasonable variation of the model according to the physical observation, and the proposed model has a lot of potential for development.

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