The use of cold twisted
deformed (Tor) bars over plain mild steel bars is economical in the following
ways.
Due to high yield strength
(nearly 50 percent) considerable saving in the steel quantity can be achieved
on account of increased bond stress such bars normally do not need end hook and
require a reduced length for overlaps. Transport storage, bending and fixing
charges are lesser up to 35 % cost of Tor Steel is only 10 % more per ton than
tested mild steel. Net economy in the cost of reinforcement up to 35 % in
tension and 30 % in compression (according to the Tor Steel research foundation
in India).
Due to great rigidity they are
easily and more accurately placed in the form work and more space can be
maintained between them in exact alignment by fewer ties and studs.
