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Prestressed concrete

Column Design

The last part of the design that was completed was the determination of the reinforcement for the columns. The columns are the most critical part of the building because the failure of a column, especially a column lower in the building, could have devastating ramifications. The failure of a column could …

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T-beam Design for Flexure

The T-beams were then designed for the flexural forces they would experience. This design comprised of the determination and selection of the adequate amount of steel necessary in each of the critical T-beam sections. The steel reinforcement is necessary in the portions of the Tbeam that are in tension because …

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Forms of Prestressing Steel

Wires Prestressing wire is a single unit made of steel. Strands Two, three or seven wires are wound to form a prestressing strand. Tendon A group of strands or wires are wound to form a prestressing tendon. Cable A group of tendons form a prestressing cable. Bars A tendon can …

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Development of Building Materials

The development of prestressed concrete can be studied in the perspective of traditional building materials. In the ancient period, stones and bricks were extensively used. These materials are strong in compression, but weak in tension. For tension, bamboos and coir ropes were used in bridges. Subsequently iron and steel bars were used to resist …

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Early Attempts of Prestressing

Prestressing of structures was introduced in late nineteenth century. The following sketch explains the application of prestress.     Mild steel rods are stretched and concrete is poured around them. After hardening of concrete, the tension in the rods is released. The rods will try to regain their original length, but …

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Pre-tensioning the spokes in a bicycle wheel

The pre-tension of a spoke in a bicycle wheel is applied to such an extent that there will always be a residual tension in the spoke. For concrete, internal stresses are induced (usually, by means of tensioned steel) for the following reasons…… • The tensile strength of concrete is only …

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Prestressed Concrete Structures

prestressed concrete structure is different from a conventional reinforced concrete structure due to the application of an initial load on the structure prior to its use. The initial load or ‘prestress’ is applied to enable the structure to counteract the stresses arising during its service period. The prestressing of a structure is …

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