Thiết kế dầm bê tông cốt thép chịu cắt có hàm lượng cốt đai rất nhỏ theo TCVN 5574:2018=Designing of reinforced concrete beams for shear resistance with very low shear reinforcement ratio according to TCVN 5574:2018

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Tác giả: Bá Huế Lê, Minh Tuấn 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.127-139

Bộ sưu tập: Metadata

ID: 239729

Thêm vào giỏ

Dầm chịu cắt cần bố trí một hàm lượng cốt đai tối thiểu để ngăn chặn sự phá hoại giòn ngay khi xuất hiện vết nứt nghiêng. Tiêu chuẩn hiện hành về thiết kế kết cấu bê tông cốt thép TCVN 5574:2018 cho phép tính toán dầm bê tông cốt thép có hàm lượng cốt đai rất nhỏ, nhỏ hơn hàm lượng cốt đai tối thiểu (khi qsw <
qsw
min). Tuy nhiên, chưa có quy trình chỉ dẫn cụ thể. Trong thực tế, người thiết kế thường lấy qsw qsw
min để bố trí cốt đai. Việc làm này sẽ rất lãng phí nhất là đối với các dầm bẹt lại sử dụng bê tông cường độ cao. Bài báo đề xuất quy trình tính toán cho hai bài toán kiểm tra và thiết kế chịu cắt khi qsw <
qsw
min với trường hợp dầm chịu tải trọng phân bố đều và chịu tải trọng tập trung. Quy trình đề xuất giúp tối ưu hóa lượng cốt đai chịu cắt, góp phần đem lại hiệu quả kinh tế cho công trình.Reinforced concrete beams should be provided with a minimum amount of shear reinforcement to prevent brittle failure as soon as an inclined crack occurs. The current standard for the design of reinforced concrete structures, TCVN 5574:2018, allows the calculation of the shear strength of reinforced concrete beams having a transverse reinforcement ratio smaller than the minimum transverse reinforcement ratio (when qsw <
qsw
min). However, there is no specific calculation procedure available. In practice, designers often take qsw qsw
min to calculate the stirrups. This result will be conservative, especially for band beams using high strength concrete. This study proposed the calculation procedures for two problems, shear checking and shear design for reinforced concrete beams, when qsw <
qsw
min in the case of the beams subjected to uniformly distributed and concentrated loads. The proposed procedures help to optimize the transverse reinforcement content, which contributes to the economic efficiency of reinforced concrete structures.

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