This article presents a virtual work based optimization method for steel moment and braced frame structures subjected to wind and seismic loading. Virtual work based structural optimization concepts are generally used in limiting drift and building period by redistributing the steel in a given lateral force resisting system so that it resists the forces and displacements more efficiently. Limiting lateral drift and period is important in reducing damage occurring in structural and nonstructural elements, lateral accelerations and also in reducing second-order P-Delta effects. If this method is used with complete understanding, a cost reduction of structural steel framing in the building can be achieved in a couple of design and analysis iterations. This paper also presents a brief literature review on virtual work based optimization, the theoretical concepts behind this procedure and how it may be effectively used on design projects. The procedure has already been implemented in Bentley's RAM Structural System Frame Drift software which is used for example studies.
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