PRESTRESSED CONCRETE

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Prestressed Concrete

Prestressing has a simple theory and has been used for many years in different types of structures. Prestressing is used to counteract the tensile stresses in the concrete beam are caused by the weight of members and imposed loads and these loads cause a positive bending moment in a beam, so prestressing is used to introduce a negative bending moment that should counteract the all of the positive bending moment.

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CONTENT

šINTRODUCTION
šAPPLICATION OF THE PRESTRESSED CONCRETE
šTERMINOLOGY
šMETHODS OF PRESTRESSING
šMIX DESIGN OF PRESTRESSED CONCRETE
šSTAGE OF LOADING
šADVANTAGES
šDISADVANTAGES
šWHY PRESTRESSED CONCRETE?
šCONCLUSION

APPLICATION OF THE PRESTRESSED CONCRETE

šWith the use of PSC reduction in structural members like slab and beam element.
šPrestressed concrete also reduces the overall weight of the structure.
Prestressed concrete is used in bridges to increase the possible span of the bridge and to make the structure more durable under moving traffic conditions.
šPrestressed concrete is widely used for residential and commercial products on the interior and exterior of building construction.
šThis concrete is used in large-span distance between which is not possible through the normal RCC construction

TERMINOLOGY

šTendon: A stretched element used in a concrete member of structure to impart prestress to the concrete.
šAnchorage: A device generally used to enable the tendon to impart and maintain prestress in concrete.
šStrands: Strands are two, three, or seven wires that are wound to form a prestressing strand.
šCable: Cables are the series or group of tendons.
šBars: The tendons are simply made up of a single steel bar and the diameter of this steel bar us larger than that of wire.

METHODS OF PRESTRESSING

PRE-TENSIONING

A method of prestressing concrete in which the tendons are tensioned before the concrete is placed. In this method, the concrete is introduced by bond between steel & concrete.

POSTTENSIONING

A method of prestressing concrete by tensioning the tendons against hardened concrete. In this method, the prestress is imparted to concrete by bearing.

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