Nghiên cứu các mô hình số mô phỏng tải trọng nổ lên kết cấu bê tông cốt thép sử dụng phần mềm abaqus=Research on numerical models to simulate the blast loads on reinforced concrete structures using abaqus software

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Tác giả: Bá Danh Lê

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học Giao thông vận tải, 2024

Mô tả vật lý: tr.1452-1462

Bộ sưu tập: Metadata

ID: 253181

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Để hạn chế tối đa thiệt hại do tải trọng nổ lên các công trình bê tông cốt thép, việc nghiên cứu về tác động của tải trọng này lên kết cấu bê tông cốt thép là hết sức cần thiết, để từ đó có các giải pháp về mặt kết cấu, giải pháp về vật liệu phù hợp. Bài báo trình bày kết quả nghiên cứu các mô hình số mô phỏng tải trọng nổ lên kết cấu bê tông cốt thép sử dụng phần mềm phần tử hữu hạn Abaqus. Ba mô hình số mô phỏng tải trọng nổ được sử dụng trong phần mềm Abaqus được nghiên cứu gồm: Phương pháp không lưới (SPH), phương pháp sử dụng khối nổ tương đương và phương pháp kết hợp Lagrangian – Eulerianian. Kết quả nghiên cứu mô phỏng số và thực nghiệm được thực hiện trên tấm bê tông cốt thép có kích thước 1000x1000x60mm. Tải trọng nổ nghiên cứu là thuôc nổ TNT được đặt cách mặt thoáng của tấm bê tông cốt thép 5cm. Bê tông được mô phỏng tuân theo mô hình Johnson–Holmquist-II (JH-2). Mô hình đàn dẻo được sử dụng để mô phỏng cốt thép. Sự hư hại và phá hủy ở mặt trên, mặt dưới và ứng xử cơ học của các mẫu thí nghiệm dưới tác động của tải trọng nổ được phân tích và so sánh giữa thí nghiệm và mô phỏng để đánh giá hiệu quả của các mô hình sử dụng.To minimize damage caused by explosive loads on reinforced concrete structures, research on the impact of this load on reinforced concrete structures is extremely necessary. From there, there are appropriate structural and material solutions. This paper presents the results of research on numerical models simulating blast loads on reinforced concrete structures using Abaqus software. Three numerical models to simulate explosive loads used in Abaqus software are studied, including: Smoothed Particle Hydrodynamics (SPH), equivalent explosive mass and combined Lagrangian - Eulerianian method. Numerical simulation research results were performed on reinforced concrete slabs with dimensions of 1000x1000x60mm. The explosive load studied was TNT explosive placed 5cm from the open surface of the reinforced concrete slab. Concrete is modeled as a brittle material and follows the Johnson–Holmquist-II (JH-2) model. The Elasto-plastic model is used to simulate the reinforcement. The damage and destruction on the top and bottom surfaces and the mechanical behavior of the slab under the blast load are analyzed and compared between experiments and simulations to evaluate the effectiveness of usage models.

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