Title: Fully and Partly Prestressed Reinforced Concrete
Author(s): P. W. Abeles
Publication: Journal Proceedings
Appears on pages(s): 181-216
In this paper it is intended to show the distinction between fully and effectively partly prestressed con- employing high strength steel. The various systems and methods are described pre-stretching and post-stretching being distinguished. The losses of the initial prestress are discussed and formulas are derived for the factor of safety against cracking and for the minimum stretching force to ensure full prestressing, to be reduced for partial pre- stressing to such extent that dangerous cracks are avoided. Published comparative test results of pre- stressed and conventionally reinforced beams are discussed and some new data are presented regarding preliminary comparative tests on beams reinforced with high tensile wire. It is shown that a partly pre-stressed beam, having a reinforcement of about one fifth of that required for mild steel, behaves similarly to a conventionally reinforced beam, when under working. load, and similarly to a fully prestressed beam (i.e. remaining crackless), when the load IS .