RESEARCH ON THE ELASTO-PLASTIC ANALYSIS OF STEEL SECTION SUBJECTED TO ALTERNATIVE LOAD (Part II)

Abstract

This paper is numerical study of the previous paper (Part I) that is elasto-plastic analysis on rectangular section subjected to axial force and alternative bending moment, and the other is a stady of calculation method using digital computer for bending curvature of symmetrical steel section under the alternative load within both its elastic and inelastic region. On this study, we find the phenomenon of incremental collapse, and sheak-down load. They are following on [numerical formula] …(1) on [numerical formula] …(2) in which, [numerical formula]. Eq. (1), (2) show the sheak-down load in case of rectangular section under axial force and reversed moment. When the reversed moment exceed eq. (1), (2), the strain are increasing one by one for direction of axial force's strain, and incremental strain (⊿ε) are [numerical formula] …(3) in which, α, ε_T are following on eq. (1) [numerical formula] …(4) on eq. (2) [numerical formula] …(5) and then. total strain (Σ__Nε)(when moment reversed N times) are [numerical formula] …(6) ε_0 : strain at first time