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Elasto-plastic Post-buckling Analysis of Spatial Framed Structures using Improved Plastic Hinge Theory  

Kim, Sung Bo (충북대학교 토목공학과)
Ji, Tae Sug (충북대학교 토목공학과)
Jung, Kyoung Hwan (충북대학교 토목공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.18, no.6, 2006 , pp. 687-696 More about this Journal
Abstract
An efficient numerical method is developed to estimate the elasto-plastic post-buckling strength of space-framed structures. The inelastic ultimate strength of beam-columns and frames is evaluated by the parametric study. Applying the improved plastic hinge analysis that evaluate the gradual stiffness decrease effects due to spread of plasticity, elasto-plastic post-buckling behavior of steel frames is investigated considering the various residual stress distributions. Introducing the plastification parameter that represent pread of plasticity in the element and performing parametric study of equivalent element force and member idealization, finite-element solutions for the elasto-plastic analysis of space frames are compared with the results by plastic region analysis, shell elements and experimental results.
Keywords
Space frame; Post-buckling analysis; Residual stress distribution; Equivalent element force;
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