Plate Flashcards
A rigid, planar, usually monolithic structure that disperses applied loads in a multidirectional pattern, with the loads generally following the shortest and stiffest routes to the supports.
Plate
The manner in which an applied load is transmitted to the supports of a plate in a multidirectional pattern.
Plate Action
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A plate extending as a structural unit over three or more supports in a given direction. This plate is subject to lower bending moments than a series of discrete, simply-supported plates.
Continous Plate
A palte structure composed of thin, deep elements joined rigidly along their boundaries and forming sharp angles to brace each other against lateral buckling. THe resulting stiffness of the cross section enables a folded plate to span relatively long distances.
Folded Plate
A plate should be square or nearly square to ensure that it behaves as two-way structure. AS a plate becomes more rectangular than square, the two-way action decreases and a one-wy system spanning the shorter direction develops since the shorter plate strips are stiffer and carry a greater portion of the load.
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A palte reinforced by a grid of curved ribs that follow the isostatics of the structure.
Isostatic Plate
Lines of principal stress indicating the flow of bending stresses and along which torsional shear stresses are zero.
Isostatics
A grid structure of beams or flat trusses running obliquely to the sides of the base rectangle in order to equalize their spans and stiffnesses. The shorter spans at the corners result in additional stiffness.
Skew Grid
A framework of crisscrossing beams connected at their intersections by rigid joints and dispersing an applied load in two directions according to the physical properties and dimensions of the beam elements.
Grid Structure
All beam elements participate in carrying a load through a combination of bending and twisting. If two beams at right angles to each other are identical, they share an applied load equally in bending. If the beams have different lengths, however, the shorter beam carries more of the load since the stiffness of a beam is inversely proportional to the cube of its length and a load generally follows that path of least resistance to supports. For example, if two beams have a span ratio 1:2, their stiffnesses with have a ratio of 1:8. Consequently, the shorter beam will carry 8/9 of the load. The torsional resistance of beams against the twisting induced by the bending of a transverse beam increases the stiffness of the grid.
A vaulted roof composed of lamellae forming a crisscross pattern of parallel arches skewed with repect to the sides of the covered space.
Lamella Roof
One of the relatively short timber, metal, reinforced-concrete elements forming a lamella roof.
Lamella
A three-dimensional structural frame based on the rigidity of the triangle and composed of linear elements subject only to axial tension or compression. The simplest spatial unit of a space frame is a tetrahedron having four joints and six structural members. As with plate structures, the supporting bay for a space frame should be square or nearly square to ensure that it acts as a two-way structure.
Space frame or Space truss
Increasing the bearing area of the supports increases the number of members into which shear is transferred and reduces the forces in the members.