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Advanced analysis and optimal design of steel frames accounting for nonlinear behavior of connections  

Choi, Se Hyu (경북대학교 방재연구소)
Park, Moon Ho (경북대학교 토목공학과)
Song, Jae Ho (금오공과대학교 토목환경공학부)
Lim, Cheong Kweon (서일대학 토목과)
Publication Information
Journal of Korean Society of Steel Construction / v.15, no.6, 2003 , pp. 661-672 More about this Journal
Abstract
The advanced analysis and optimal design of semi-rigid frame were presented. Advanced analysis can predict the combined nonlinear effects of connection, geometry, and material on the behavior and strength of semi-rigid frames. The Kishi-Chen power model was used to describe the nonlinear behavior of semi-rigid connections. Geometric nonlinearity was determined using stability functions. On the other hand, material nonlinearity was determined using the Column Research Council (CRC) tangent modulus and parabolic function. The direct search method proposed by Choi and Kim was used as optimization technique. The member with the largest unit value evaluated using the LRFD interaction equation was replaced one by one with an adjacent larger member selected from the database. The objective function was assumed as the weight of steel frame, with the constraint functions accounting for load-carrying capacities, deflections. inter-story drifts, and ductility requirement. Member sizes determined by the proposed method were compared with those derived using the conventional LRFD method.
Keywords
advanced analysis; optimal design; direct search method; steel frames;
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