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■■■■■■■■■■■■■■■■■■■ 川崎製鉄技報 KAWASAKI STEEL GIHO Vol.2 (1970) No.4 ■■■■■■■■■■■■■■■■■■■ |
| ハイブリット・プレートガーダーの曲げ耐荷力に関する実験的研究 Experimental Study on Hybrid Plate Girders under Bending Moment 前田 幸雄(Yukio Maeda) 村田 勝弘(Katsuhiro Murata) |
| 要旨 : フランジに58kg/mm2級高張力鋼，ウェブに50kg/mm2級高張力鋼を使用した実物大のハイブリッド・プレートガーダーについて，破壊に至る各主要部材の挙動を実験によって確認した。実験結果の主たる特徴としては，(1)ホモジニアス・プレートガーダーに比して極限荷重における破壊は急激に起きる (2)水平補剛材を圧縮フランジから1/5腹板高さへ配置した場合，腹板のたわみは防止され，耐荷力は梁理論による圧縮フランジ降伏モーメントより大きくなる (3)圧縮フランジの形状を変化させ，フランジ自身の剛度を増加させると，極限耐荷力が大きくなること などが挙げられる。 |
| Synopsis : This paper describes an experimental research on the ultimate strength of hybrid plate girders. It has customarily been considered that the use of high strength steel for a compression flange of a plate girder is, not appropriate so far as the present design specification governs, under which the buckling strength of a plate girder is defined to be the function of its elastic rigidity. The compression flange of a plate girder is however, much more rigid in terms or buckling compared to that of a single plate, because the former is constrained with a continuous web. The previous study on plate girders worked in 1968 at Osaka University gives us an indication that the ultimate strength of plate girders under pure bending moment is governed by the yield strength of their compression flanges. This fact has led us to suppose that there might be a more rational design method, using high strength steels for main members of girders, and to make a plan of a more extensive research on hybrid plate girders with flanges of RIVER TEN 58 (SMA58) and web plates of RIVER TEN 50A (SMA 50A), of atmospheric corrosion resisting steel both. The specific emphasis among subjects was put on the following points, i.e., (1) the influence of slenderness ratio of web plate hybrid plate girders upon their ultimate strength, (2) the influence due to the variety of material properties, rigidity and flange shapes upon their ultimate strength, (3) the behavior of compression flanges with the various shapes of hybrid plate girders, and (4) the influence of horizontal stiffeners upon the deformations and stress distributions of web plates, and also upon the ultimate strength of girders. Remarkable phenomena observed through the study are as follows: (1) the collapse of the hybrid plate girders occur more suddenly than that of homogeneous plate girders, (2) application of triangular shapes for compression flanges increase not only the rigidity of flanges themselves but their ultimate strength, (3) the initial deformation of a web plate, when its ratio with panel or height is less than 1/150, shows no deffective influence upon the ultimate strength of plate girders, (4) in case there are no longitudinal stiffeners, redistribution of stress on compression zone is similar to that of homogeneous girders, (5) the effective height of web plate with longitudinal stiffeners under bending moment is taller than without them, and (6) the flanges of hybrid plate girders, with β more than 200, bring forth the locally plastic buckling even it c/d (ratio of flange width over its thickness) is less than eight and a half. |
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