Nghiên cứu thực nghiệm biến dạng của dầm liên hợp thép - bê tông với mức độ liên kết khác nhau=Experimental Investigating the Strain of The Steel-concrete Composite Beams with Different Shear Connection Degree

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Tác giả: Hoa Dinh Thai, Phuoc Nhan Le Van

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Xây dựng, 2024

Mô tả vật lý: tr.108

Bộ sưu tập: Metadata

ID: 479912

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Liên kết kháng cắt đóng một vai trò quan trọng trong dầm liên hợp thép - bê tông và ảnh hưởng đến ứng xử uốn của dầm liên hợp thép - bê tông. Như khả năng chịu tải, độ võng, biến dạng trượt tương đối giữa dầm thép và bản bê tông,… Nhiều loại liên kết kháng cắt đã và đang được sử dụng trong xây dựng trong đó phổ biến nhất là liên kết kháng cắt dạng chốt. Tuy nhiên, liên kết kháng cắt dạng perfond hiện ngày càng được sử dụng rộng rãi. Trong nghiên cứu này, liên kết kháng cắt dạng perfobond được hàn vào cánh trên của dầm thép, dọc theo chiều dài dầm để ngăn cản sự trượt tương đối giữa dầm thép và bản bê tông của dầm liên hợp. Quá trình thí nghiệm được tiến hành trên hai dầm có kích thước thực để nghiên cứu ảnh hưởng của mức độ liên kết kháng cắt đến biến dạng của dầm liên hợp thép - bê tông. Hai dầm liên hợp thép - bê tông có số liên kết kháng cắt khác nhau, một trong hai dầm có hai mươi liên kết kháng cắt, dầm còn lại được bố trí mười liên kết kháng cắt. Từ khóa: Liên kết kháng cắt dạng perfobond
mức độ liên kết kháng cắt
dầm liên hợp thép - bê tông, biến dạngShear connectors play an important role in steel-concrete composite beams and affect the bending behaviors of the steel-concrete compositebeams, such as the load capacity, the vertical deflection, the relative slip between the steel girder and the concrete slab, and so on. Many kinds of shear connectors have been used in construction and the most popular shear connector used in the world is the stud shear connector. However, perfobond shear connectors have been more and more used. In this study, perfobond shear connectors were welded on the top flange of the steel girder and along the beam length to prevent the relative slip between the steel girder and the concrete slab of steel-concrete composite beams. A test program was carried out on two large-scale steel-concrete composite beams to investigate the effect of the shear connection degree on the strain of the steel-concrete composite beams. Two steel-concrete composite beams had different numbers of shear connectors, one of them had twenty shear connectors and the other had ten shear connectors. Keywords: Perfobond shear connector, shear connection degree, steel-concrete composite beam, strain.

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