Hệ số uốn dọc của cột liên hợp thép

Hệ số uốn dọc của cột liên hợp thép - bê tông

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Tác giả: Thị Bình Chu, Lệ Thủy Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại: 624 Civil engineering

Thông tin xuất bản: Khoa học kiến trúc và xây dựng, 2018

Mô tả vật lý: 34-37,43

Bộ sưu tập: Metadata

ID: 488257

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Chủ đề

The effect of buckling is always required to be considered in calculation of load capacity of compression elements. Currently, design of composite steel and concrete structures has still not been enclosed in Vietnamese design standards
hence Eurocodes is usually applied in designing of this type of structures. Eurocodes proposes the European buckling curves to take into account the effect of buckling to compression resistance of composite steel and concrete column, however, this method has its scope of application. This paper presents the calculation results of buckling factor of some type of composite steel and concrete columns which are beyond the application of Eurocodes. Material and geometric non-linear model in structural analysis software SAFIR was used. From calculation results, some comments and recommendations were proposed.Trong tính toán kết cấu nói chung và kết cấu liên hợp thép - bê tông nói riêng, khả năng chịu lực của cấu kiện chịu nén luôn cần xét đến ảnh hưởng của uốn dọc. Hiện nay tiêu chuẩn Việt Nam vẫn chưa có phần thiết kế kết cấu liên hợp thép - bê tông cũng như sự ảnh hưởng của uốn dọc lên cấu kiện chịu nén của vật liệu này, nên thường phải dùng tiêu chuẩn châu Âu. Để tính toán ảnh hưởng của uốn dọc tới khả năng chịu nén của cột liên hợp thép - bê tông tiêu chuẩn châu Âu đưa ra các đường cong uốn dọc (European buckling curves) song giới hạn phạm vi áp dụng. Nội dung bài báo trình bày các kết quả tính toán hệ số uốn dọc của một số cột liên hợp thép - bê tông nằm ngoài phạm vi giới hạn mà tiêu chuẩn châu Âu đã nêu ra. Để mô phỏng sự làm việc của cấu kiện này sử dụng mô hình phi tuyến vật liệu và hình học, cũng như dùng phần mềm SAFIR để phân tích kết cấu. Qua các kết quả tính toán đưa ra một số nhận xét và khuyến nghị.

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