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The presence of the slab on the compression side of a T-beam permits the use of a large amount of tensile, steel in the rib. In continuous spans, however, the reverse moment at the support is usually comparable in magnitude with the span moment, and so also calls for a considerable amount of tensile steel; but as the slab is now not on the compression side the rib concrete often requires the assistance of compression reinforcement (Fig. 1).
In order to use available materials in the most efficient manner, it is essential for the user to have full knowledge of the properties and characteristics of the material
supplied for prestressing tendons. The purpose of this paper is to consider the various conditions in which cold drawn high tensile steel wire can be supplied, and the
effect of various treatments on the behaviour of this material in terms of service conditions.
In reinforced concrete design it is generally assumed that the strain in the steel reinforcement is equal to the strain in the concrete immediately surrounding it. This
is substantially true in zones of compression but, in the parts subject to tension, the working stress in the steel is usually high enough for the strain to be more than
the surrounding concrete can withstand without cracking. The size of the cracks formed in this way and their spacing along the reinforcement depends primarily on the bond but is also affected by the strain in the steel, the tensile strength of the concrete and its modulus of elasticity.