7.2 transportation, storage, and scientific experimentation. Externally, the structure must bear docking loads, power generation loads, and loads associated with orbit maintenance. In emergency situations the structure should be able to maintain its integrity during rapid spin rate or pressurization changes. To meet all of these requirements requires a structural analysis far more sophisticated than the one attempted in this report. However, using simplified analysis techniques, good judgment, and referring to structural systems in operation today, a reasonable structural design can be postulated. In the following sections the structural design analysis will be presented. A discussion of the loads imposed on the structure during assembly and after occupation will be given in Section VII.2. The analysis of a problem of this scope requires that several construction techniques be considered before a final design is attempted. Decisions have to be made concerning the materials, alloys, assembly technique and final hull configuration. A comparison will be made among all the alternatives considered in each of the above areas in Section VII.3. The actual method of analysis used in calculating the stresses and the deflections of the structural components and their fatigue life will be outlined in Sections VII.4 and VII.5 with the detailed equations presented in the appendices following this chapter. The final configuration will be presented in Section VII.6 including drawings of the various components. Finally, an overall evaluation of the structural design will be made in Section VII.7 with future recommendations being considered at that time. VII. 2: LOADS VII.2.1: General Remarks: In this section we will treat the loads on the actual double-hulled structure as the major concern with only general consideration of peripheral structures and the loads they might incur. The hull must be designed to withstand the loads imposed upon it by the conditions of normal habitability including the "gravity" variation described in Section VI.3.5. In addition, loads will be
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