International journal of steel structures (국제강구조저널)

Korean Society of Steel Construction (한국강구조학회)
권호 표지

Optimal Design of Semi-Rigid Steel Frames using Practical Nonlinear Inelastic Analysis

Choi, Se-Hyu;Kim, Seung-Eok
최세휴;김승억

  • Published : 20060000
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Abstract

IntroductionConventional analysis of steel frame structures is usuallycarried out under the assumption that the beam-to-columnconections are either fully rigid o inelastic analysis realistically assesses both strength and behavior of a structural system and its component members in a directmanner. To capture second-order efects associated with P-δ and P- moments, stability functions are used to minimizemodeling and solution time. The Column Research Council (CRC) tangent modulus concept is used to account for gradualyielding due to residual stresses. A softening plastic hinge model is used to represent the degradation from elastic to zerorigid conections. A section increment method is used for minimum weight optimization. Constraint functions are load-carryingcapacities and displacements. A member with the largest unit value evaluated by LRFD interaction equation is replaced oneby one with an adjacent larger member selected in the database. Member sizes determined by the proposed method arecompared with those given by other approaches.

Keywords

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