Phân tích tĩnh phi tuyến hình học và vật liệu cấu kiện dầm-cột ống thép tròn nhồi bê tông=Geometric and material nonlinear static analysis of circular concrete-filled steel tube beam-columns

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Tác giả: Ngọc Tịnh Nghiêm Đoàn, Hữu Cường Ngô, Thế Danh Nguyễn, Thị Tố Lan Nguyễn, Văn Hiếu Nguyễn, Thị Tường Quy Phan

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.13-25

Bộ sưu tập: Báo, Tạp chí

ID: 225526

Thêm vào giỏ

Concrete-filled steel tube (CFST) beam-columns are structural members with many dominant features for multistorey building structures due to their high strength, rigidity and ductility in comparison with normal members as well as their slender architectural apperance, good fire-resistant capacity and construction convenience. This paper develops a nonlinear analysis program by Matlab programing language to predict the structural responses of high-strength CFST beam-columns subjected to eccentric loading with the consideration of confined effects to concrete core of the steel tube and the initial geometric imperfection of beam-columns. The composite crosssection of CFST beam-columns is partitioned into many steel and concrete fibers and the section state is updated during the analysis process to consider the inelastic effects combined with the consideration of geometrically nonlinear effects between the member ends. The analysis results obtained from the developed program are compared to those of existing studies to prove that it is an efficient and relatively accurate simulation tool in predicting the resistance capacity of high-strength circular CFST beam-columns under static loadings in research and technical design.Dầm-cột ống thép tròn nhồi bê tông (CFST) là cấu kiện kết cấu có nhiều đặc điểm nổi trội cho kết cấu nhà nhiều tầng do có cường độ, độ cứng và độ dẻo dai cao hơn những loại cấu kiện thông thường trong khi có hình dáng kiến trúc thanh mảnh, có khả năng chống cháy tốt và thuận tiện cho thi công. Bài báo này phát triển một chương trình phân tích phi tuyến bằng ngôn ngữ lập trình Matlab để dự đoán ứng xử kết cấu của cấu kiện dầm-cột CFST cường độ cao dưới tác dụng của tải trọng nén lệch tâm có kể đến tác động bó lõi bê tông của ống thép và sự không hoàn hảo ban đầu về hình học của cấu kiện dầm-cột. Tiết diện liên hợp của cấu kiện dầm-côṭ được chia thành nhiều điểm thớ thép và bê tông và trạng thái của tiết diện được cập nhật trong suốt quá trình phân tích để kể đến tác động phi đàn hồi kết hợp với sự xem xét tác động phi tuyến hình học giữa hai đầu cấu kiện. Những kết quả phân tích số đạt được từ chương trình phát triển được so sánh với các kết quả của các nghiên cứu khác chứng tỏ rằng nó là một công cụ mô phỏng khá hiệu quả và tương đối chính xác trong việc dư ̣đoán khả năng chiụ lưc̣ của cấu kiện dầm-cột CFST tròn nhồi bê tông cường độ cao chiụ tải troṇ g tıñ h trong nghiên cứu và thiết kế kỹ thuâṭ.

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