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김주헌(Ju Hun Kim),이은택(Eun Taik Lee),김덕재(Duck Jae Kim) 한국강구조학회 1995 韓國鋼構造學會誌 Vol.7 No.2
Based on the existence of a yield surface and a bound surface which represents the maximum stress state the material ever experienced, a plasticity model is modified to describe the behaviour of metal under nonproportional loadings. This paper is concered with the improvement of a plasticity model of the two surface type for structural steel based on experimentally observed features of 304 stainless steel specimens tested under axial torsional cyclic nonproportional loading condition at room temperature performed by Medowell. The proposed model is verified through an experimental program that includes different combinations of nonproportionally applied forces performed by Lee.
반복하중에 의한 철골부재의 소성힌지 거동에 관한 실험적 연구
이은택(Eun Taik Lee),김덕재(Duck Jae Kim) 한국강구조학회 1993 韓國鋼構造學會誌 Vol.5 No.2
Most research studies on inelastic material behavior of steel structures under earthquake ground motions are concentrated on general uniaxial cyclic loading conditions. Very limited attention has been given to the responses of structures subjected multiaxial and nonproportional loading condition. The primary objectives of these experiments are to obtain quantitative information on the cyclic and nonproportional loading behavior of wide-flanged A-36 structural steel, and to substantiate a plasticity model to describe the material behavior under severe earthquake loading condition by using a computer-controlled testing system. The response of W-shaped A-36 structural steel specimens subjected to selected pure bending, pure bending with constant axial loads, and the random nonproportional loadings are examined.