The Structural Engineer > Archive > Volume 53 (1975) > Issues > Issue 8 > Design of Structural Frames to Deflexion Limitations
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Design of Structural Frames to Deflexion Limitations

Structural frames are usually designed to satisfy deflexion requirements by trial and error. Recent optimization methods are restricted to small or very specialized structures. In the general method proposed herein an efficient analysis program is used to determine linear approximations to the rates of change of deflexions with the section properties of the frame members. A simple linear programming procedure then determines the most economical changes of section required to satisfy the deflexion constraints. Cycles of analysis and optimization continue until a satisfactory design is obtained. Comparisons with other methods show that this design is likely to be close to the optimum. Haunched frames can be designed and the reduction in frame stiffness due to compressive axial loads can also be allowed for. Examples of the application of the method to plane steel frames are given. D. Anderson and J. Salter

Author(s): Anderson, D;Salter, J

Keywords: frames;design;portal frames