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>STUDY ON THE CONSTITUTIVE RELATION OF STRUCTURAL STEEL UNDER MULTI-AXIAL STRESS PART 1. IN CASE OF UNI-AXIAL LOADING PATHS
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STUDY ON THE CONSTITUTIVE RELATION OF STRUCTURAL STEEL UNDER MULTI-AXIAL STRESS PART 1. IN CASE OF UNI-AXIAL LOADING PATHS
The stress-strain relationship including the plastic deformation phase is essential information for structural design of buildings. However, lack of empirical data prevents the development of analysis model for multi-axial stress state. With this background, the test setup was designed for the multi-axial loading. In this system, a cylindrical specimen is subjected to both axial force and torsion, and a uniform multi-axial stress can be generated in the cross-section. The loading equipment provides various loading paths, such as cyclic axial loading, cyclic torsion loading, alternate or simultaneous loading of axial force and torsion. As the first stage of the whole project, this paper focuses on the uni-axial hysteresis model which is applicable to both axial stress and shear stress. For this purpose, axial loading tests and shear loading tests were performed, and the hysteresis behavior was investigated. The previously proposed model, which was derived from axial loading tests, was applied to these experiments, and the applicability to shear stress was confirmed.
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