Displacement Maximisation Of Haunched-rafter
Pitched-roof Steel Portal Frames
Author(s)
H. K. Issa & F. A. Mohammad
Abstract
Pitched-roof Steel Portal Frames (SPFs) are common structures used in single
storey buildings. It is necessary for this popular steelwork to pass through an
optimisation process to minimise the total cost of the frame. Optimisation in
terms of weight is well documented with different optimisation techniques.
However, this approach to displacement maximisation is somehow rare. In this
paper, an attempt is made to perform optimisation in terms of lateral
displacements. To achieve this, a modified distributed genetic algorithm (DGA)
is used to maximise lateral displacements of the SPF while the constraints meet
the requirements of BS 5950. Furthermore, software ‘DO-DGA’ (Design
Optimisation using DGA), coded by Visual Basic 6.0, has been developed by the
authors to loop the optimisation process. Although the appearance and form of
SPFs are simple, according to BS 5950, there are more limitations to be checked
than in complex structures. A stiffness matrix has been derived for the haunched
part of the rafter using a column analogy and a virtual work method to involve
this part in the analysis process. Through two benchmark examples, the
comparison is made between the results of weight minimisation and
displacement maximisation.
Keywords: distributed genetic algorithm, steel portal frame, optimisation,
displacement maximisation.
Keywords
distributed genetic algorithm, steel portal frame, optimisation,displacement maximisation.
Related Book
Other papers in this volume
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