pier

/pear/, n.

1. a structure built on posts extending from land out over water, used as a landing place for ships, an entertainment area, a strolling place, etc.; jetty.

2. (in a bridge or the like) a support for the ends of adjacent spans.

3. a square pillar.

4. a portion of wall between doors, windows, etc.

5. a pillar or post on which a gate or door is hung.

6. a support of masonry, steel, or the like for sustaining vertical pressure.

7. a long passageway or corridor that extends from a central area of a building, esp. one at an airport that leads to boarding gates.

[bef. 1150; ME pere, earlier (perh. late OE) per < AL pera, pera pier of a bridge]

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I

In building construction, a vertical load-bearing member such as an intermediate support for adjacent ends of two bays or spans.

Bulkier than a column but smaller than a wall, a pier can support an arch or beam. The lower portion of a pier may be widened to better distribute the downward pressure of a massive overlying structure. In Romanesque and Gothic architecture, a feature of the nave arcade is the compound pier, which is cross-shaped in cross section, with shafts placed in the recesses.

II

(as used in expressions)

Cavalli Pier Francesco

Nervi Pier Luigi

Pasolini Pier Paolo

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▪ architecture

      in building construction, vertical loadbearing member such as an intermediate support for adjacent ends of two bridge spans. In foundations for large buildings, piers are usually cylindrical concrete shafts, cast in prepared holes, while in bridges they take the form of caissons (caisson), which are sunk into position. Piers serve the same purpose as piles but are not installed by hammers and, if based on a stable substrate, will support a greater load than a pile.

      Especially adapted to large construction jobs, pier shafts having widths of more than 1.8 m (6 feet) have been excavated to depths greater than 30 m. The lower portion of a pier may be widened to better distribute the downward pressure of a massive overlying structure. Formerly hand-dug shafts were widely used for piers where groundwater presented no serious problem, but hand excavation has been largely superseded by the use of rotary or percussion drilling. The massive augers used to drill shafts for the piers of modern skyscrapers are mounted vertically on derricks, and the piers themselves are sufficiently long and wide to support the tremendous weight of even the tallest building. Piers for bridges are often installed by the caisson method. The caisson is a hollow boxlike structure that is sunk down through the water and then through the ground to the bearing stratum by excavating from its interior; it ultimately becomes a permanent part of the completed pier.

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