Word Finder - spans

definition

The space from the thumb to the end of the little finger when extended; nine inches; an eighth of a fathom.

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(by extension) A small space or a brief portion of time.

example

He has a short attention span and gets bored within minutes.

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A portion of something by length; a subsequence.

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The spread or extent of an arch or between its abutments, or of a beam, girder, truss, roof, bridge, or the like, between supports.

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The length of a cable, wire, rope, chain between two consecutive supports.

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A rope having its ends made fast so that a purchase can be hooked to the bight; also, a rope made fast in the center so that both ends can be used.

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A pair of horses or other animals driven together; usually, such a pair of horses when similar in color, form, and action.

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The space of all linear combinations of something.

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The time required to execute a parallel algorithm on an infinite number of processors, i.e. the shortest distance across a directed acyclic graph representing the computation steps.

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To extend through the distance between or across.

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The suspension bridge spanned the canyon.

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To extend through (a time period).

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The novel spans three centuries.

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To measure by the span of the hand with the fingers extended, or with the fingers encompassing the object.

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to span a space or distance; to span a cylinder

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To generate an entire space by means of linear combinations.

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To be matched, as horses.

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To fetter, as a horse; to hobble.

A steel bridge spans the river.

The North Bridge, a fine iron structure, spans the valley, giving connexion between the opposite higher parts of the town.

A fine railway bridge (1888) spans the Ohio.

But the mere paying out of sufficient slack is not a guarantee that the cable will always lie closely along the bottom or be free from spans.

The advantage claimed for roofs formed with one or two large spans is that they permit the platforms and tracks to be readily rearranged at any time as required, whereas this is difficult with the other type, especially since the British Board of Trade requires the pillars to be not less than 6 ft.

Long bridges of several spans are often termed " viaducts," and bridges carrying canals are termed " aqueducts," though this term is sometimes used for waterways which have no bridge structure.

It is only since metal has been used that the great spans of Soo to 1800 ft.

For moderate spans brick, masonry or concrete can be used without excessive cost, but for longer spans steel is more economical, and for very long spans its use is imperative.

In some recent masonry arched bridges of spans up to ' so f t.

In suspension bridges the principal members are in tension, and the introduction of iron link chains about the end of the 18th century, and later of wire ropes of still greater tenacity, permitted the construction of road bridges of this type with spans at that time impossible with any other system of construction.

Nevertheless, the stiffened suspension bridge will probably be the type adopted in future for very great spans.

In the simplest case the main girders are supported at the ends only, and if there are several spans they are discontinuous or independent.

But a main girder may be supported at two or more points so as to be continuous over two or more spans.

Hence many multiple-span bridges such as the Hawkesbury, Benares and Chittravatti bridges have been built with independent spans.

The Amoskeag bridge over the Merrimac at Manchester, N.H., U.S.A., built in 1792, had 6 spans of 92 ft.

The Bellows Falls bridge over the Connecticut (built 1785-1792) had 2 spans of 184 ft.

As railway loads increased and greater spans were demanded, the Howe truss was stiffened by timber arches on each side of each girder.

Iron suspension bridges began to be used at the end of the 18th century for road bridges with spans unattainable at that time in any other system.

It is, therefore, a type specially suited for great spans.

The Brooklyn bridge, begun in 1872, has a centre span of 15952 and side spans of 930 ft.

These girders are supported by the cables over the centre span but not in the side spans.

Intermediate piers support the trusses in the side spans.

The clear width of the two shore spans is 270 ft.

Itl ' At first girders had soli or plate webs, but for spans o 9 over ioo ft.

Though each girder has been made continuous over the four spans it has not quite the proportions over the piers which a continuous girder should have, FIG.

The spans were in fact designed as independent girders, the advantage of continuity being at that time imperfectly known.

As no scaffolding could be used for the centre spans, the girders were built on shore, floated out and raised by hydraulic presses.

On the other hand a framed or braced web afforded opportunity for much better arrangement of material, and it very soon became apparent that open web or lattice or braced girders were more economical of material than solid web girders, except for small spans.

Now plate web girders are only used for spans of less than ioo ft.

It was a bridge for two lines of railway with lattice girders continuous over three spans.

The centre span was 264 ft., and the side spans 138 ft.

It has two spans of 455 ft.

The side spans are erected first on staging and anchored to the piers.

The total weight of iron and steel in three spans was about 5000 tons.

It is available for spans greater than those practicable with independent girders; in fact, on this system the spans are virtually reduced to smaller spans so far as the stresses are concerned.

The two main spans are each 1710 ft.

Waddell has shown that, in some cases, it is convenient to erect simple independent spans, by building them out as cantilevers and converting them into independent - (5) The Poughkeepsie bridge over the Hudson, built 1886-1887.

There are five river and two shore spans.

The girders over the second and fourth spans are extended as cantilevers over the adjoining spans.

The girder spans are 525 ft., the cantilever spans 547 ft., and the shore spans 201 ft.

The bridge consists of three spans of about 315 ft.

The bridge has three spans, each formed of arches of cast steel.

It is formed by a crescent-shaped arch, continued on one side by four, on the other side by two lattice girder spans, on iron piers.

The lattice girders of the side spans were first rolled into place, so as to project some distance beyond the piers, and then the arch ribs were built out, being partly supported by wire-rope cables from (3) Draw or Bascule Bridges.

At Konigsberg there is a road bridge of two fixed spans of 39 ft., and a central span of 60 ft.

Two spans are arranged for opening easily.

The Runcorn bridge crosses the Manchester Ship Canal and the Mersey in one span of woo ft., and four approach spans of 552 ft.

The Moerdyk bridge in Holland, with 14 spans of 328 ft., was erected in a similar way.

Modifications of the system have been adopted for bridges with discontinuous spans.

The following are some of the results Large as these loads are on short spans, they are not more than must often be provided for.