prestressed concrete

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prestressed concrete

[¦prē′strest ′kän‚krēt]
(materials)
Concrete compressed with heavily loaded wires or bars to reduce or eliminate cracking and tensile forces.

prestressed concrete

A process of anchoring steel rods into the ends of forms, then stretching them before the concrete is poured, putting them under tension. When the concrete hardens, they spring back to their original shape, providing additional strength. See also: Concrete

Prestressed concrete

Concrete with stresses induced in it before use so as to counteract stresses that will be produced by loads. Prestress is most effective with concrete, which is weak in tension, when the stresses induced are compressive. One way to produce compressive prestress is to place a concrete member between two abutments, with jacks between its ends and the abutments, and to apply pressure with the jacks. The most common way is to stretch steel bars or wires, called tendons, and to anchor them to the concrete; when they try to regain their initial length, the concrete resists and is prestressed. The tendons may be stretched with jacks or by electrical heating.

Prestressed concrete is particularly advantageous for beams. It permits steel to be used at stresses several times larger than those permitted for reinforcing bars. It permits high-strength concrete to be used economically, for in designing a member with reinforced concrete, all concrete below the neutral axis is considered to be in tension and cracked, and therefore ineffective, whereas the full cross section of a prestressed concrete beam is effective in bending. See Reinforced concrete, Stress and strain

prestressed concrete

Concrete in which internal stresses are introduced of such magnitude and distribution that the tensile stresses resulting from the service loads are counteracted to a desired degree; in reinforced concrete the prestress commonly is introduced by tensioning the tendons.
References in periodicals archive ?
Finally, this paper obtained the deflection of pre-stressed concrete beams under the variable load through experiments and finite element method.
Smith-Midland supplied the pre-stressed concrete pavement slab panels which replaced concrete pavement along 1,000 linear feet of westbound I-66 in all four lanes and a portion of the ramp to Route 50 in Fairfax County.
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Rocla, which makes pre-stressed concrete railroad ties and turnout ties, is based in Denver, Colorado and has production facilities in Pueblo, Colorado; Amarillo, Texas; and Bear, Delaware.
9 May 2013 -- Connecticut, USA-based investment firm Altus Capital Partners said it has acquired US pre-stressed concrete railroad tie manufacturer Rocla Concrete Tie Inc.
Dubai has begun the construction of the world's largest pre-stressed concrete drinking water reservoirs.
No explicit attempt is made to place the architecture within it postwar context, and only passing reference is made to some wonderful experimental pieces -- such as the Fairway Cafe's pre-stressed concrete diagrid roof and the wonderfully precarious 'Carry-Cot' offices.
This superb building features 6" reinforced concrete floors; pre-stressed concrete walls; ceiling heights to 20' clear; steel columns spaced 25' x 35'; all utilities; 100% wet sprinkler system; 36,000 sq.
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It manufactures and markets pre-stressed concrete strand and welded wire reinforcement, including engineered structural mesh, concrete pipe reinforcement and standard welded wire reinforcement.