Figure 9.4 Top and side view of a planer tetrahedral truss. Other attempts to study truss types was also done by Mikulas, et. al. in 1977 in their engineering characterization of a tetrahedral truss (See Figure 9.3). There analysis included not only the structural stiffness, strength and dynamics characteristics, but included sizing analysis' such as number of columns per square kilometer versus column length (Figure 9.6), column load due to orbital transfer and many others. Quantification of the structure also was done for several sizes and column lengths. Issues of this kind are paramount for considering the cost and feasibility of large scale projects such as an SPS project. Table 9.4 Selection Criteria and Concept Evaluation (with bold dilating best choice)
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