Nghiên cứu thực nghiệm độ cứng và độ bền uốn của cột bê tông cốt thép lắp ghép với liên kết ống lồng bơm vữa=Experimental study of bending stiffness and strength of pre-cast column with grouted sleeve connection

0 Người đánh giá. Xếp hạng trung bình 0

Tác giả: Mạnh Tùng Võ

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học công nghệ xây dựng (Đại học Xây dựng Hà Nội), 2024

Mô tả vật lý: tr.132-142

Bộ sưu tập: Metadata

ID: 225444

Thêm vào giỏ

Mục đích của bài báo này là xác định độ cứng và độ bền uốn áp dụng cho các cột lắp ghép với các mối nối ống lồng bơm vữa, trong đó các đoạn cột bê tông đúc sẵn được ghép nối và so sánh với cột bê tông cốt thép toàn khối. Nghiên cứu thực nghiệm được thực hiện với các thí nghiệm uốn hai mẫu cột CLK – cột toàn khối và CLG - lắp ghép. Các liên kết ống lồng bơm vữa đã được thiết kế đảm bảo chiều dài nối chồng theo tiêu chuẩn thiết kế kết cấu bê tông cốt thép Việt Nam TCVN 5574:2018. Dựa trên những phân tích kết quả thí nghiệm, độ bền của mối nối và độ cứng tổng thể của đoạn cột 9 m có một mối nối đều lớn hơn đoạn cột toàn khối có cốt thép dọc tương đương. Vì vậy hoàn toàn có thể sử dụng và mô hình tính toán loại cột lắp ghép này như các cột toàn khối thông thường.The purpose of this paper is to determine the bending stiffness applicable to pre-cast concrete columns with grouted sleeve connections in which precast concrete columns are coupled and compare with monolithic reinforced concrete columns. Experimental research was carried out with bending tests on two samples of CLK columns – the monolithic column and CLG – precast concrete columns. The grouted sleeve connections have been designed to ensure the overlapping length according to Vietnamese standard TCVN 5574:2018. Based on the analysis of experimental results, the connection strength and overall stiffness of the 9 m column with a connection are both larger than that of the monolithic column with equivalent longitudinal reinforcement. Therefore, it is completely possible to use and calculate this type of pre-cast column as normal monolithic columns.

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