7. Gl APPENDIX VII.G EXAMPLE OF INTERIOR STRUCTURE VII . G.l: GENERAL REMARKS The following text and equations outline the basic design process necessary for any interior structure. This appendix does not deal with architectural designs but with engineering limits. VII.G.2: ANALYSIS As an example of a colony building, consider a structure three floors high. In such a building only the floor need be structural, with the loa·d trar:sferred between floors by columns. Therefore, the walls need only be present to provide an enclosure. For a clamped plate, the maximum deflection is given by: g b E t w max _ agb 4 -~ loading (N/m 2 ) width of section (m) Young's modulus of elasticity plate thickness (m) (N/m 2 ) The optimum structural shape for the floor section is a square. The value of a for a square section is 0.0138 and E = 2 . 06xlo 11 N/m 2 . To ensure a stiff floor and a pressure-tight building, the design criterion is for a maximum sustained load g of 5723 N/m 2 , which gives a thickness of 24.4 cm for an unstiffened 20 x 20m plate in order to have a wm;x 2 0.5 cm. As calculated by a Rayleigh-Ritz analysis similar to that used to size the bulkheads and inner hull (Appendix VII . F), the floor, with rectangular stiffeners (h - 4b) every meter, has thickness 12.5 cm, and the stiffener height is 50 cm. From this analysis, it seems prudent to reduce the effective
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