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Nonlinear Dynamic Analysis of Space Steel Frames  

Kim Seung-Eock (세종대학교 토목환경공학과)
Cuong Ngo-Huu (세종대학교 토목환경공학과)
Lee Dong-Ho (세종대학교 토목환경공학과)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.18, no.4, 2005 , pp. 395-404 More about this Journal
Abstract
This paper presents a reliable numerical procedure for nonlinear time-history analysis of space steel frames subjected to dynamic loads. Geometric nonlinearities of member (P-$\delta$) and frame (P-$\Delta$) are taken into account by the use of stability functions in framed stiffness matrix formulation. The gradual yielding along the member length and over the cross section is included by using a tangent modulus concept and a softening plastic hinge model based on the New-Orbison yield surface. A computer program utilizing the average acceleration method for the integration scheme is developed to numerically solve the equation of motion of framed structure formulated in an incremental form. The results of several numerical examples are compared with those derived from using beam element model of ABAQUS program to illustrate the accuracy and the computational efficiency of the proposed procedure.
Keywords
dynamic analysis; geometric and material nonlinearities; plastic-hinge; stability functions; space steel frames;
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