![]() Since grids are very rigid structures, they require members that are shallower than planar systems. For up to almost 30 ft span single-layer grids are efficient, however, for larger spans double-layer grids are more appropriate, which can be used for spans up to about 300 ft. The four-way grids are made of a combination of rectangular and diagonal grids. ![]() ![]() This system has a more even stress distribution that the two-way grids. The three-way single-layer grids are generally used for larger span or when the structure is subjected to large concentrated loads. The diagonal grid, in which the members are oriented in an oblique manner to the supporting structure along the edge, has great rigidity (or stiffness), i.e., substantial reduction in deflection. These interconnected patterns consist of two-way, three-way or four-way configurations, with the most common pattern being rectangular grid in which the intersecting elements are perpendicular to each other. There are different types of single-layer grid used as the main structural systems for roofs and floors. If all the members of a grid are in the same plane, it is called a single-layer grid. <<Back to the Previous Page <<Introduction Index <<KnowledgebaseĪ grid can be comprised of two or more sets of parallel members intersecting each other at an angle and loaded perpendicular to their planes. Structure And Form Analysis System (SAFAS) Single and Double-Layer Grids::Introduction::Knowledgebase::Structure and Form
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