PRESTRESSED CONCRETE
by Abhijeet Katiyar May 22, 2020 · PPT's / RCC
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.
CONTENT
INTRODUCTION
APPLICATION OF THE PRESTRESSED CONCRETE
TERMINOLOGY
METHODS OF PRESTRESSING
MIX DESIGN OF PRESTRESSED CONCRETE
STAGE OF LOADING
ADVANTAGES
DISADVANTAGES
WHY PRESTRESSED CONCRETE?
CONCLUSION
APPLICATION OF THE PRESTRESSED CONCRETE
With the use of PSC reduction in structural members like slab and beam element.
Prestressed 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.
Prestressed concrete is widely used for residential and commercial products on the interior and exterior of building construction.
This concrete is used in large-span distance between which is not possible through the normal RCC construction
TERMINOLOGY
Tendon: A stretched element used in a concrete member of structure to impart prestress to the concrete.
Anchorage: A device generally used to enable the tendon to impart and maintain prestress in concrete.
Strands: Strands are two, three, or seven wires that are wound to form a prestressing strand.
Cable: Cables are the series or group of tendons.
Bars: 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.
POST–TENSIONING
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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