Thực hành tính toán liên kết kết cấu thép thành mỏng tạo hình nguội cho khung phẳng một tầng một nhịp=Calculation Practice for the Connections of Cold-Formed Thin-Walled Steel Structures for Single-Story, Single-Span Frames

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Tác giả: Ngọc Thắng Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Xây dựng, 2024

Mô tả vật lý: tr.104

Bộ sưu tập: Metadata

ID: 479903

Thêm vào giỏ

Kết cấu thép thành mỏng có nhiều ưu điểm hơn so với kết cấu thép thông thường. Nhất là cho công trình chịu tải trọng nhỏ như nhà kho, nhà xưởng không có cầu trục, nhà xe ... Với ưu điểmvượt trội của nó về thẩm mỹ, khả năng chịu lực cũng như sự tiết kiệm vật liệu, trọng lượng nhẹ, thi công nhanh … Tuy nhiên, ở nước ta, việc tính toán thiết kế loại kết cấu này còn khá xa lạ với phần lớn kỹ sư, đặc biệt trong tính toán liên kết. Nhiều kỹ sư vẫn sử dụng các tiêu chuẩn thiết kế kết cấu thép cán nóng như TCVN 5575:2012 để tính toán liên kết cho kết cấu thành mỏng là không phù hợp. 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 phân tích liên kết và tính toán theo các bài toán ở giới hạn đàn hồi. Bài báo trình bày một bài toán thực hành tính toán liên kết khung thép một tầng, một nhịp tiết diện I được ghép tổ hợp từ 2 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.Thin-walled steel structures offer several advantages over conventional steel structures, especially for projects subjected to light loads such as warehouses, workshops without overhead cranes, and garages. Their outstanding features include aesthetic appeal, load-bearing capacity, material savings, lightweight, and rapid construction. However, in our country, the design calculations for this type of structure are still relatively unfamiliar to most engineers, particularly in connection design. Many engineers continue to use hot-rolled steel design standards such as TCVN 5575:2012 for calculating connections for thin-walled structures, which is not suitable. In some cases where experimental validation is not available, it is possible to refer to the methods outlined in the American specifications (AISI) for analyzing connections and calculating based on elastic limit problems. This paper presents a practical calculation problem for theconnections of a single-story, single-span steel frame with I-sections assembled from two C-sections in cold-formed thin-walled steel. Keywords: Cold-formed thin steel, yield strength, tensile strength, cold-formed C-section.

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