New points in TCVN 5575:2024 and the use of bi-moment in the strength verification of flexural members

In countries with advanced science and technology, important standards in the field of structural design for buildings and civil structures - particularly in steel and reinforced concrete structures - are constantly monitored, revised, or updated. The Vietnamese standard TCVN 5575:2012 - Steel Structures - Design Standard has been in effect for 13 years since its issuance and has now been replaced by the new version TCVN 5575:2024. This paper focuses on analyzing and presenting several notable updates introduced in TCVN 5575:2024, including: the structure of the standard, its scope of application, classification of structural members and structural groups, design strength of materials and steel structural connections, as well as reliability factors. In the structural design section, several updated aspects in the calculation of flexural members are analyzed with consideration of the bi-moment component. The application of TCVN 5575:2024 also emphasizes critical updates concerning material grades, reliability factors, and the effect of bi-moment forces in conducting strength checks and connection calculations for a Grade 1 steel beam with a closed rectangular hollow section and an open-section thin-walled C - beam. The analysis demonstrates that the updates in TCVN 5575:2024 - Steel Structures - Design Standard are harmonized with international standards, enhance structural safety, optimize design efficiency, and improve constructability in the field of steel structures.

How to Cite

Pham, N.Thi 2025. New points in TCVN 5575:2024 and the use of bi-moment in the strength verification of flexural members (in Vietnamese). Journal of Mining and Earth Sciences. 1, 67 (Dec, 2025), 106-117. DOI:https://doi.org/10.46326/JMES.2026.67(1).09.

References

American Institute of Steel Construction. (2016). ANSI/AISC 360-16: Specification for structural steel buildings. AISC.

Bộ Khoa học và Công nghệ. (2000). TCVN 3223:2000 - Que hàn điện dùng cho thép cacbon thấp và thép hợp kim thấp – Ký hiệu, kích thước và yêu cầu kỹ thuật chung. Nhà xuất bản Khoa học và Kỹ thuật.

Bộ Khoa học và Công nghệ. (2012). TCVN 5575:2012 – Kết cấu thép – Tiêu chuẩn thiết kế. https://caselaw.vn/van-ban-phap-luat/251362-tieu-chuan-quoc-gia-tcvn-5575-2012-ve-ket-cau-thep-tieu-chuan-thiet-ke-nam-2012.

Bureau, A. (2010). NCCI: Elastic critical moment for lateral torsional buckling (SN003b-EN-EU). CTICM/Access Steel (Eurocode 3 – NCCI).

European Committee for Standardization. (2006). Eurocode 3: Design of steel structures – Part 1-3: General rules – Supplementary rules for cold-formed members and sheeting. CEN.

Hoàng, V. Q., Hàn, N. Đ., and Nguyễn, H. N. (2024). Ví dụ tính toán kết cấu thép. Nhà xuất bản Xây dựng.

Lalin, V. V., Rybakov, V. A., and Morozov, S. A. (2012). Finite element analysis for the calculation of thin-walled beam systems. Magazine of Civil Engineering, (1), 61-70.

Ministry of Construction of the Russian Federation. (2017a). SP 16.13330.2017: Steel structures (Updated edition of SNiP 23-81). Moscow, Russia.

Ministry of Construction of the Russian Federation. (2017b). SP 294.1325800.2017: Design of steel structures for high-temperature technological equipment. Moscow, Russia.

Nguyễn, H. S. (2023). Một số vấn đề khi thiết kế kết cấu tạo hình nguội theo EN 1993-1-3. Tạp chí Xây dựng, 113–119.

Steel Construction Institute. (2004). Non-contradictory complementary information SN007b-EN-EU NCCI. The NBS Publication Index. https://www.thenbs.com/publicationindex/documents/details?DocId=322818andPub=SCI

Tikhonov, S. M., Alekhin, Vss. N., and Belyaeva, Z. V. (2020). Design of steel structures. Pero Publishing House.

Viện Tiêu chuẩn Chất lượng Việt Nam. (2024). TCVN 5575:2024 - Thiết kế kết cấu thép. https://tieuchuan.vsqi.gov.vn/tieuchuan/view?sohieu=TCVN+5575%3A2024andutm

Vũ, L. Q. (2023). Tính toán xoắn kiềm chế thanh thành mỏng tiết diện hở. Tạp chí Xây dựng, 43–45

	Citations	1200
	h-index	11
	i10-index	21

Abstracting & Indexing