Authors: Adewuyi, A. P.; Franklin, S.
ARPN Journal of Engineering and Applied Sciences, Vol. 6, No.12, pp. 55-61. Asian Research Publishing Network (ARPN).
Abstract
Although strengthening of structures by post-tensioning is much more common in practice, the authors did locate innovative literature on the theory and applications of post-compression which form the basis for this study.
This work analytically assesses the behaviour and criteria for optimal performance of prestressed concrete structures under the combined actions of post-tensioning and post-compression. Magnel type diagrams are also developed to show the feasible solution regions for different loading conditions. The findings revealed that the prestressing forces in the post-tensioned tendons are independent of the eccentricity ratio, but increases perfectly curvilinearly up to prestressing ratio of 0.7 beyond which the technique becomes impracticable. On this basis, there is a realistic reduction of 50 percent in the eccentricity and possibly the overall depth of the concrete section over the conventional technique. This qualifies this structural innovation as a reliable candidate for long span structures.
Keywords: prestressed concrete, post-compression, post-tensioned, Magnel type diagram.