Design Representations

In the reported experiments, steel structural systems were represented by linear genomes. For Problems Ia, Ib, and Ic the genomes were homogenous, i. e., they were composed of identical genes encoding wind bracing elements. For Problems Ia and Ib these genes had 2 values (binary representations) and for Problem Ic the genes had 7 values (integer-valued representation). Entire steel structural systems in tall buildings considered in Problem II were represented by nonhomogeneous genomes. They included 3 types of genes:

• encoding wind bracing elements with 7 possible values (see Figure 3a)

• encoding beam elements with binary values (see Figure 3b)

• encoding supports with binary values (see Figure 3c)

The length of the genome depended on the problem considered. For Problems Ia-Ic the genome was 150 genes long whereas for Problem II it consisted of 306 genes.