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2. Steel frame - Wikipedia

   en.wikipedia.org/wiki/Steel_frame

   Steel frame structure Rectangular steel frame, or "perimeter frame" of the Willis building (at right) contrasted against the diagrid frame at 30 St Mary Axe (at center), in London. Steel frame is a building technique with a " skeleton frame" of vertical steel columns and horizontal I-beams , constructed in a rectangular grid to support the ...

3. Marston Mat - Wikipedia

   en.wikipedia.org/wiki/Marston_mat

   RAF aircrew with one of their Bristol Beaufighters on a PSP airstrip at Biferno, Italy, August 1944. Marston Mat, more properly called pierced (or perforated) steel planking (PSP), is standardized, perforated steel matting material developed by the United States at the Waterways Experiment Station shortly before World War II, primarily for the rapid construction of temporary runways and ...

4. Grid (spatial index) - Wikipedia

   en.wikipedia.org/wiki/Grid_(spatial_index)

   Quadtrees are a specialised form of grid in which the resolution of the grid is varied according to the nature and complexity of the data to be fitted, across the 2-d space. Polar grids utilize the polar coordinate system, using circles of a prescribed radius that are divided into sectors of a certain angle. Coordinates are given as the radius ...

5. Hollow structural section - Wikipedia

   en.wikipedia.org/wiki/Hollow_structural_section

   A hollow structural section (HSS) is a type of metal profile with a hollow cross section. The term is used predominantly in the United States, or other countries which follow US construction or engineering terminology. HSS members can be circular, square, or rectangular sections, although other shapes such as elliptical are also available.

6. Diagrid - Wikipedia

   en.wikipedia.org/wiki/Diagrid

   A diagrid (a portmanteau of diagonal grid) is a framework of diagonally intersecting metal, concrete, or wooden beams that is used in the construction of buildings and roofs. [1] It requires less structural steel than a conventional steel frame. Hearst Tower in New York City, designed by Norman Foster, uses 21 percent less steel than a standard ...

7. Dropped ceiling - Wikipedia

   en.wikipedia.org/wiki/Dropped_ceiling

   The primary grid types are "Standard 1" (15 ⁄ 16-inch face), Slimline (9 ⁄ 16-inch grid), and concealed grid. In the United States and its neighboring countries, the cell size in the suspension grids is typically either 2 by 2 feet (610 mm × 610 mm) or 2 by 4 feet (610 mm × 1,220 mm), and the ceiling tiles, light fixtures, and fluorescent ...