By Kim S. Elliott
Precast bolstered and prestressed concrete frames offer a excessive power, solid, sturdy and strong resolution for any multi-storey constitution, and are broadly considered as a top quality, monetary and architecturally flexible expertise for the development of multi-storey constructions. The ensuing structures fulfill a variety of advertisement and commercial wishes. Precast concrete structures behave in a distinct way to these the place the concrete is forged in-situ, with the parts topic to various forces and activities. those elements are explored intimately within the moment version of Multi-Stor. �Read more...
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Additional info for Multi-Storey Precast Concrete Framed Structures
Whereas structural steel can be stockpiled ready for cutting, and in situ concrete be poured at short notice, precast products must be manufactured to order. In some countries precast concrete is viewed as a ‘value-added product’ and therefore carries a VAT surcharge over cast-in situ concrete. On a worldwide scale the scope for high-specification precast concrete in buildings is still very large. The trend seems to be that in places where contracts are controlled by the contractor, rather than by the architect or client, precast is used mainly for the horizontal components, such as prestressed floors.
2) Structural design and erection is nearly always (in 95 per cent of cases) carried out by the nominated precast manufacturer, thus depriving the consulting engineer of direct control over the frame design. Few clients, particularly government departments, will commit to a single-source manufacturer prior to design. There is a greater tradition of ‘design and build’ in the Continental construction industry. (3) There is a lack of manufacturing capacity. Large-scale precast production demands capital investment.
5 m span beams, and so on. They do not include major volumes of cast-in situ concrete, such as structural toppings. The rates are affected by vertical transportation time, typically 3–5 minutes extra per item for buildings of more than about 6–10 storeys, respectively. g. winter versus summer weather and daylight hours, regionally available plant, particularly 5–10 tonne lifting capacity tower cranes, and ground conditions from green field to congested city sites. The data were collected from UK companies between 1990 and 1996.