Khảo sát sức chịu nén và momen chịu uốn giới hạn của chân cột thép theo tiêu chuẩn EN 1993-1-8=A study on the limit compressive strength NRd and limit bending moment MRd of the steel column base according to the EN 1993-1-8 standard

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Tác giả: Phước Hảo Bùi, Gia Truyền Ngô

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Công thương, 2024

Mô tả vật lý: tr.342-350

Bộ sưu tập: Metadata

ID: 475679

Thêm vào giỏ

In the design of steel column bases, the limit compressive strength N Rd and limit bending moment M Rd are the controlled conditions that need to be given proper attention, otherwise it will cause damage to the concrete foundation block at the base of the column. This study determined the compressive strength and ultimate bending moment of steel column bases through the effective area method according to the EN 1993-1-8 standard. The study’s results showed that the N Rd and the M Rd of the steel column base tend to increase gradually as the base plate thickness and concrete foundation block grade are increased. For each base plate thickness (from t=18mm to t=36mm) and each concrete grade (from C16/20 to C50/60), the N Rd and the M Rd of the steel column base will vary. However, it is important to remember that the compressive force and bending moment capacity of the column base will be limited and cannot increase forever. For example, it cannot exceed the compressive force capacity N pl,Rd and the resistance bending limit M pl,Rd of the concrete foundation block at the base of the column.Trong thiết kế chân cột thép, thông số sức chịu nén giới hạn N Rd và moment chịu uốn giới hạn M Rd là một trong những điều kiện khống chế cần được quan tâm đúng mức, nếu không sẽ gây phá hoại khối móng bê tông dưới chân cột. Bài báo này nhằm xác định cường độ chịu nén và momen chịu uốn giới hạn của chân cột thép bằng phương pháp diện tích hữu hiệu theo tiêu chuẩn EN 1993-1-8. Qua kết quả khảo sát, thấy rằng N Rd và M Rd của chân cột thép phải chịu có xu hướng tăng dần khi tăng dần chiều dày bản đế và mác khối móng bê tông. Khi đó, ứng với từng chiều dày bản đế (từ t=18mm đến t=36mm) và từng mác bê tông (từ c 16/20 đến C50/60) sẽ cho kết quả tương ứng với từng N Rd và M Rd . Tuy nhiên, cần hiu ý điều quan trọng là khả năng chịu lực nén và momen chịu uốn của chân cột sẽ bị giới hạn, không thể tăng mãi, chẳng hạn không thể vượt qua khả năng chịu lực nén N pl,Rd và độ bền chịu uốn giới hạn M pl,Rd của khối móng bê tông dưới chân cột.

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