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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.