Kết cấu thép thành mỏng tạo hình nguội và đánh giá sự gia tăng cường độ do cứng nguội

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Tác giả: NGỌC THẮNG NGUYỄN, THỊ PHƯƠNG LAN TRẦN

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Xây dựng, 2024

Mô tả vật lý: tr.126

Bộ sưu tập: Metadata

ID: 372105

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Currently, the use of cold-formed thin steel structures is prevalent in our country, including common applications such as purlins, roof panels, bracing, and various structures like single-story frames, multi-story frames, roof structures, and Zamil steel frames. Due to their thin profile characteristics, which include various types of cold-formed steel and shaped cold-formed sheeting, these structures differ from conventional ones. As a result, conventional elasticity theories and design calculation methods for steel structures are not applicable in this case. The increase in yield strength and tensile strength, as well as the reduction in material stiffness, directly depend on the extent of the cold-forming process. This is determined based on experiments involving the tensile compression of materials when the curved shape returns to an unloaded state during the consolidation phase. However, in some cases where there is no experimental validation, one can refer to calculation methods outlined in the American standards (AISI) to assess the enhanced properties of strength due to this cold-forming stiffness. The article presents a specific survey for the cold-formed C-section profile. Keywords: Cold-formed thin steel
yield strength
tensile strength
cold-formed C-section.Hiện nay, kết cấu thép thành mỏng tạo hình nguội là loại kết cấu đã và đang sử dụng nhiều ở nước ta, thông dụng như xà gồ, tấm lợp mái, thanh giằng, các dạng kết cấu như khung nhà một tầng, khung nhà nhiều tầng, kết cấu mái, khung thép Zamil. Do có đặc điểm cấu tạo thành mỏng (bao gồm các loại thép và tôn định hình tạo hình nguội) khác biệt với các kết cấu thông thường nên lý thuyết đàn hồi thông thường và các phương pháp tính toán thiết kế đối với kết cấu thép không áp dụng được trong trường hợp này. Sự tăng ứng suất chảy và cường độ kéo giới hạn cũng như làm giảm độ cứng của vật liệu phụ thuộc trực tiếp vào mức độ của quá trình tạo hình nguội. Điều này thu được dựa trên cơ sở các thí nghiệm kéo nén vật liệu khi đường cong dỡ tải trở về trạng thái không tải tại giai đoạn củng cố. Tuy nhiên, trong một số trường hợp không có thí nghiệm kiểm chứng, có thể tham khảo cách tính theo chỉ dẫn trong quy phạm Mỹ (AISI) để đánh giá đặc tính gia tăng cường độ do cứng nguội này. Bài báo trình bày một khảo sát cụ thể cho tiết diện chữ C thành mỏng tạo hình nguội. Từ khóa: Thép mỏng tạo hình nguội
ứng suất chảy
cường độ kéo giới hạn
tiết diện chữ C.

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