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Ultimate Strength Analysis of Space Steel Frames Considering Spread of Plasticity  

Kim, Sung Bo (충북대학교 토목공학과)
Han, Jae Young (충북대학교 토목공학과)
Park, Soon Cheol (건화엔지니어링)
Kim, Moon Young (성균관대학교 토목공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.15, no.3, 2003 , pp. 299-311 More about this Journal
Abstract
This paper presents a finite element procedure to estimate the ultimate strength of space frames considering spread of plasticity. The improved displacement field is introduced based on the inclusion of second-order terms of finite rotations. All the non-linear terms due to bending moment, torsional moment, and axial force are precisely considered. The concept of plastic hinges is introduced and the incremental load/displacement method is applied for elasto-plastic analyses. The initial yield surface is defined based on the residual stress, and the full plastification surface is considered under the combined action of axial forces, bending and torsional moments. The elasto-plastic stiffness matrices are derived using the flow rule and the normality condition of the limit function. Finite element solutions for the ultimate strength of space frames are compared with available solutions and experimental results.
Keywords
Finite element; Ultimate strength; Space frame; Spread of plasticity; Plastic hinge; Plastic region;
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