https://www.designingbuildings.co.uk/w/index.php?feed=atom&target=Oppo&title=Special%3AContributions%2FOppoDesigning Buildings - User contributions [en]2026-04-05T11:11:24ZFrom Designing BuildingsMediaWiki 1.17.4https://www.designingbuildings.co.uk/wiki/Precast_consertPrecast consert2022-04-11T13:02:20Z<p>Oppo: Created page with "Precast concrete offers many advantages, including a reduction of the construction period, cost efficiency, high-quality control, fast and accurate erection of members, and envir..."</p>
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<div>Precast concrete offers many advantages, including a reduction of the construction period, cost efficiency, high-quality control, fast and accurate erection of members, and environmental protection. Despite the aforementioned advantages of the precast concrete members, the conventional precast members may show drawbacks in the following aspects: (i) the use of the concrete pour forms at the joints delaying the erection of each subsequent frame and (ii) the lack of the structural continuity and redundancy in the load paths when beams simply sit on corbels without providing moment resisting capacity. Precast steel-concrete hybrid frames are preferable over the conventional precast concrete practices since they are less heavy, achieving cost-efficient structural systems with fast erections. The conventional steel connections can be used for the precast column-to-beam joints, offering rapid and facile erection similar to that of steel frames with few crews on site. [[File:Precast-Concrete-Wall-Panel-Install.jpg]]<br />
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=== Precast Concrete ===<br />
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Precast concrete has several benefits in the repair of damaged concrete structures: ease of construction, rapid construction, high quality, durability, and economy. Precast concrete is traditionally used for the following types of repairs:<br />
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Navigation locks<br />
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Dams<br />
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Channels<br />
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Flood walls<br />
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Levees<br />
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Coastal structures<br />
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Marine structures<br />
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Bridges<br />
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Culverts<br />
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Tunnels<br />
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Retaining walls<br />
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Noise barriers<br />
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Precast concrete is reinforced concrete that is cast away from the building site, and assembled on site. Some (but not all) precast concrete is available in standard shapes and dimensions: floor and roof planks, tees and double-tees are examples. Otherwise, precast concrete may be fabricated in any shape and size consistent with the laws of statics; the strength and stiffness of the materials; and the constraints imposed by formwork, transportation, handling, and erection.<br />
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Precasting may imply a loss of structural continuity if connections are made with steel inserts bolted or welded together to create simple supports. On the other hand, it is possible to design precast systems whose behavior is identical to that of site-cast systems by maintaining the continuity of steel reinforcement from element to element. Special products are available to connect rebars that have been left exposed at the ends of the concrete pieces; nonshrinking grouts are then used to fill in the voids and complete the structural connection.<br />
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Precast concrete is more widely used as “nonstructural” cladding than as primary structure, at least in the United States. The quotation marks around nonstructural hint at the inadequacy of the term: in fact, all cladding is structural since it must resist wind, seismic, and impact loads and transfer these loads to the primary lateral-force resisting structural system of the building.<br />
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Highway pavement<br />
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