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 板厚変化部を有する鋼製梁のCFRP耐震補強工法に関する実験的研究
Tác giả hoặc Nhóm tác giả: 
Kazuki OSHIMA, Kazuo OHGAKI, Ngoc Vinh PHAM, Toshihiro MIKI, Yuya HIDEKUMA, and Shunta SAKURAI
Nơi đăng: Proceedings of the 23nd Symposium on Bridge Earthquake Engineering; Số: Volume 23;Từ->đến trang: 139-146 (ISBN: 978-4-8106-1045-1);Năm: 2021
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
Recently, the applicability of carbon fiber-reinforced plastic (CFRP) sheet, as a repairing and retrofitting material for aging or damaged structures is being intensively investigated because of the light weight, high strength, and superior durability of CFRP sheets. In steel bridges, there are several locations in which the thickness of the cross-section of steel members was changed at the welded joints, therefore it is concerned that the load-carrying capacity of the steel members at these locations is not sufficient to resist the earthquakes loads. This study investigated the effectiveness of a retrofitting method using CFRP sheets for H-section steel beams with varying cross-section under the 4-point-bending and 3-point-bending-shear cyclic loading tests. The loading tests were carried out by varying the types (high modulus and intermediate modulus) of CFRP sheets, and with and without using the polyurea putty layer. Results showed that the proposed retrofitting method using the intermediate modulus type of CFRP sheets and the polyurea putty increased significantly the seismic load-carrying capacity and bending stiffness of the H-section steel beam, and improved the distributed stress on the varying cross-sectional location.
ABSTRACT
Recently, the applicability of carbon fiber-reinforced plastic (CFRP) sheet, as a repairing and retrofitting material for aging or damaged structures is being intensively investigated because of the light weight, high strength, and superior durability of CFRP sheets. In steel bridges, there are several locations in which the thickness of the cross-section of steel members was changed at the welded joints, therefore it is concerned that the load-carrying capacity of the steel members at these locations is not sufficient to resist the earthquakes loads. This study investigated the effectiveness of a retrofitting method using CFRP sheets for H-section steel beams with varying cross-section under the 4-point-bending and 3-point-bending/shear cyclic loading tests. The loading tests were carried out by varying the types (high modulus and intermediate modulus) of CFRP sheets, and with and without using the polyurea putty layer. Results showed that the proposed retrofitting method using the intermediate modulus type of CFRP sheets and the polyurea putty increased significantly the seismic load-carrying capacity and bending stiffness of the H-section steel beam, and improved the distributed stress on the varying cross-sectional location.
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