Effects of Semi-Rigid Connections and P-? Forces on the Optimum Design of Seismic Steel Frames

by Juang Der-Shin, Natl Central Univ, Taiwan,



Document Type: Proceeding Paper

Part of: Seismic Engineering: Research and Practice

Abstract:

By utilizing methods of optimality critera and constraint gradients, the minimum weight design of semi-rigid planar steel frames subjected to static and seismic excitations is presented in this paper. The structural formulation, which is based on the displacement method and consistent mass method, takes into consideration of the second-order effect resulting from static and dynamic forces that axially loaded on the columns. The constraint functions included in this study are stresses, displacements, story drifts, and minimum member sizes. Numerical examples are provided to study the effects of rigidity of connections, P-? forces, and vertical ground excitations on the optimum weight, stiffness distributions, and response behavior.

Subject Headings: Steel frames | Seismic design | Steel structures | Minimum weight design | Structural behavior | Seismic tests | Rigid frames

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