Abstract
A concept of composition of designable spaces that were already introduced by the authors is proposed and is demonstrated with a developed structural design system by means of a couple of the steel frame systems. This paper describes the secondary structural design system that deals with braced steel frames and non-braced steel frames. The sizes of structural members in the braced frames are smaller than those of the non-braced frames. The system was examined for some comparisons of the solutions with respect to situation of existence of steel brace. The paper concludes that the system is a useful tool for the novices in the structural design field because the composition of designable spaces provides them important information on the structural design.
