Paper Title
Analytical Investigation of Prestressed Concrete

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. The pre-stressing concrete Used for preparing the section is a bit different from the reinforced cement concrete (RCC.) in concrete technology. The system used for pre-stressing is defined by two methods that are, pretensioning& post-tensioning methods. The pre-stressing by pre & post tensioning device mechanism, introduced for Anchoring the system in concrete structure element is used for structures. In modern type of Pre-stressing technique electricity having low value of voltage and high current is adopted in anchoring for a concrete member & A Coating of sulphur is applied on the steel bars working, as duct material before the casting of concrete member. When the electricity is supplied in the structure, the sulphur gets melted due to generation of heat in the steel structure and allowed them for pre-stressing. No provision is required for any duct. The steel alloy structure having high strength could be anchored by tightening the nuts at both ends. The Pre-stressing in concrete structure is found more effective then reinforced cement concrete (RCC) technology. So in this paper we will discuss about advanced technique of post tensioning by replacing duct with sulphur coating on tendon bars. Keywords - Prestressed Concrete, Post-Compression, Post-Tensioned, MAGNEL Type Diagram.