Phân tích ứng xử dầm cao bằng mô phỏng số ABAQUS

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Tác giả: Việt Phương Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học Kiến trúc & Xây dựng, 2024

Mô tả vật lý: tr.32

Bộ sưu tập: Metadata

ID: 479483

Thêm vào giỏ

Dầm cao bê tông cốt thép là loại cấu kiện khá phổ biến trong các công trình xây dựng tại Việt Nam, đặc biệt nhất là dầm chuyển trong các công trình nhà cao tầng. Đối với các dầm cao, giả thiết tiết diện phẳng, ứng suất không còn phân bố tuyến tính, các công thức xây dựng trên giả thiết tiết diện phẳng không còn phù hợp. Điều này dẫn đến việc tính toán, thiết kế dầm cao sẽ khác biệt so với dầm thông thường. Việc làm rõ ứng xử dầm cao và sự khác biệt so với dầm thường là cần thiết. Hiện nay việc phân tích dầm cao được tiến hành dựa trên 2 trường hợp: (1) tỷ số nhịp/chiều cao dầm L/h
(2) tỷ số nhịp chịu cắt/chiều cao dầm. Tuy nhiên các giá trị này còn khác nhau giữa các tiêu chuẩn. Bài báo tiến hành khảo sát các trường hợp tỷ số nhịp/chiều cao dầm khác nhau, đồng thời sử dụng 2 trường hợp đặt tải tương ứng với tỷ số nhịp chịu cắt/chiều cao dầm thay đổi. Kết quả cho thấy rằng khái niệm dầm cao phân biệt bằng tỷ số nhịp/chiều cao dầm theo tiêu chuẩn châu Âu và khái niệm phân biệt bằng tỷ số nhịp chịu cắt/chiều cao dầm theo tiêu chuẩn ACI 318 là phù hợp. Abstract Reinforced concrete deep beams are commonly used for buildings in Vietnam, especially for transfer beams in high-rise buildings. Assuming flat section, stress is no longer distributed linearly, formulas based on flat section assumption are no longer suitable for deep beams. This leads to the calculation and design of deep beams that are different from those of normal beams. It is necessary to clarify the behavior of deep beams and their differences from those of normal beams. Currently, the analysis of deep beams is conducted based on two cases: (1) span/height ratio (L/h)
(2) ratio of shear span/beam-height. However, these values differ between standards. The paper investigates the cases of different span/height ratio of beams, and uses 2 load cases corresponding to the ratio of shear span/beam height changes. The results show that the concept of deep beams distinguished by span/height ratio according to European standards and the concept by ratio of shear span/beam height according to ACI 318 standard is appropriate.

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