A short curved tendon arranged at interior support of a continuous beam where anchors are in compression zone and curved portion is in tensile zone is called as a cab cable and it is small in size and consists of anchorages and its sides.

When loads of same intensities are subjected to structures, n prestressing increases mean stresses in steel and effects caused due to fluctuations in stresses are minimized which increase life of material.

Linear prestressing is mostly applicable for straight members such as slabs, beams etc and members are prestressed in a linear manner, tendons are spliced in case of continuous prestressed concrete members to gain continuity and various types of splices used as tendons are screw connector, torpedo splices, clamp splice and wrapped splice.

In words of Guyon: ?re is no structural problem to which prestress cannot provide a solution, and often a revolutionary one, Prestress is more than a technique; it is a general principle? is description or explanation given by Guyon on prestressing.

Prestressed concrete is widely used in many branches of civil engineering and building construction and in recent days it is experiencing greatest growth in field of commercial building because of its acoustic properties and its ability to provide long open space.

The basic concept involved in analysis of prestressed concrete members is concept of combined direct and bending stresses used for columns whereas principle and shear stresses are formed in case of tensioning prestressed and reinforced structures, overhead stresses are formed while stresses in structures goes beyond safe limit provided by different codes.

Anchorage is term used to denote a device which helps tendons to transmit prestress to member and maintain it for design period, generally used to enable tendon to impart and maintain prestress in concrete and commonly used anchorages are Freyssinet, Magnel, Balton, Gifford-udall, Leon hardt etc.

A superior amount of rigidity is offered by prestressed concrete flexural members under working load conditions when compared with that offered by reinforced concrete members of equal dimensions.

Compression in concrete and tension in steel is developed by use of expanding cements due to its elastic property or expanding property, joint cement is an adhesive used primarily for attaching joint tape that is placed over beams whereas water cement ratio is ratio of weight of water to weight of cement used in a concrete mix.

Due to utilization of concrete in tension zone, an extra saving of 15 to 30 percent in concrete is possible in comparison with reinforced concrete high tensile steels are used in prestressed members and its ultimate strength is equal to 2100n/mm2 and saving in steel are even higher, 60 ? 80 percent mainly due to high permissible stresses allowed in high tension wires.