Anti-seismic designs have been applied to plant support steel frames for years. Today, a
rational structure that further improves seismic resistance and ensures economic performance is
required in response to an increase of seismic load on the assumption of predicted future massive
earthquakes. For satisfying this requirement, a steel frame design method that combines a steel
frame weight minimizing method, which enables economic design through simultaneous
minimization of multiple steel frame materials, and a seismic response control design technology
that improves seismic resistance has been established. Its application in the design of real
structures has been promoted. This paper gives an overview of this design technology and presents
design examples to which this design technology is applied.