span

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span

1. Psychol the amount of material that can be processed in a single mental act
2. short for wingspan
3. a unit of length based on the width of an expanded hand, usually taken as nine inches

Span

The interval between any two consecutive supports of a beam, girder, or truss or between the opening of an arch.

Span

 

of a bridge, the part of a bridge that extends between the bridge piers and carries various loads, such as transportation vehicles, pedestrians, and winds, which it transfers to the piers.

A span consists of such bearing components as longitudinal beams or trusses, crossbeams or diaphragms, and slabs for the roadway. In arch bridges the main bearing components are the arches, which support the structure above them. Loads carried by spans are transferred to piers through bearing parts. The roadway slab of a span supports a roadbed and pedestrian sidewalks. The surface of the slab is paved with a layer of topping of asphalt or cement concrete and waterproofing. The material used for a span may be a metal, such as an aluminum alloy or steel, plain or reinforced concrete, native stone, or wood.

The span is the most important part of a bridge. The structural design of a bridge and its static diagram depend on the static diagram of the span. The span may be of the girder, frame, arch, suspension, guy, or combination type. The general architectural composition of a bridge is essentially dependent on the type of span. Ordinarily a span is rectilinear as viewed from the top, although the spans of modern bridges, viaducts, and overpasses over the junctions of transportation lines may have more complicated shapes and be spiraled, ringed, or branched.

The static diagram and the structural material used determine the way in which a span is constructed. Spans are usually built from prefabricated units manufactured in specialized plants or yards.


Span

 

in buildings and structures, the distance between the neighboring supports of horizontal structural elements. There are spans, for example, between the columns that support a roof truss and between the piers that support a bridge span. Standardized span dimensions that conform to the Unified Modules System are currently used in construction in the USSR.

span

[span]
(aerospace engineering)
The dimension of a craft measured between lateral extremities; the measure of this dimension.
Specifically, the dimension of an airfoil from tip to tip measured in a straight line.
(engineering)
A structural dimension measured between certain extremities.
(mathematics)
For a set A, the intersection of all sets that contain A and have some specified property. Also known as hull.
For a set of vectors, the set of all possible linear combinations of those vectors. Also known as linear span.
(statistics)
The difference between the highest value and the lowest value in a range of values.

bearing distance, span

The length of a beam between its bearing supports.

span

1. The interval between two terminals of a construction.
2. The distance apart of any two consecutive supports, esp. as applied to the opening of an arch.
3. A structural member (or part of a member) between two supports.

span

span
spanclick for a larger image
i. The tip-to-tip distance of a wing. Winglets, tip tanks, and tip pods are not included while measuring the span.
ii. The operating radial distance from the root to the tip of a rotating airfoil, such as helicopter rotors or turbine or compressor blades.
References in periodicals archive ?
The researchers were able to manipulate the yeast life span by mutating certain chemical residues to mimic the acetylated and deacetylated forms of the protein Sip2.
In 1935 Clive McCay, a professor of nutrition at Cornell, noted that if laboratory rats are fed only about two-thirds of the food they would freely choose to eat, their life spans increase by 40 percent to 50 percent.
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Individuals who need a job to survive will probably benefit from traditional trait-and-factor approaches; a person who wants to do continuous life planning over the life span will profit from approaches that are more holistic and that include various life roles and goals and other dimensions of their lives.
It is ludicrous to talk about "the end of economic growth" while in the same breath extolling the enormous promise of these technologies--you can't have stagnating living standards and rising life spans.
Those interested in improving male sexual health through all-natural, scientifically supported means can now look to 112 Degrees[TM], the flagship product from LIFE SPAN labs available exclusively through www.
Being nocturnal or diurnal gives the biggest life span boost compared with being active at dawn and dusk, when more predators may be out.
In contrast, the AX-dependent life span extension was not observed even in a daf-16 null mutant.
A team of Johns Hopkins and National Taiwan University researchers have successfully manipulated the life span of common, single-celled yeast organisms by figuring out how to remove and restore protein functions related to yeast aging.
Another goal for this stage of counseling would be for Sue to understand that to promote optimal life functioning throughout her life span, her future career development shoul d reflect her dynamic life theme (Peavy, 1997).
Its star-shaped flowers only bloom in the spring, and its average life span lasts just a short year.