Spandepth ratios

It is difficult to generalise about overall span:depth ratios for space grid structures as they depend on the method of support, type of loading and, to a large extent, on the system being considered. Makowski suggests that span:depth ratios should be reduced to approximately 20 when the supports are only at, or near, the corners of the grid. Span tables produced by Space Deck Ltd indicate that for typical loadings, roof span:depth ratios of about 30 are possible using standard modules when square on plan. For example, a square

roof supported on all four sides can span up to 40 m based on a module that is only 1200 mm deep.

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