TITLE:
PSC Bridge Subjected to Combined Post Tension and Post Compression—A Case Study
AUTHORS:
Sujith Shetty Sundar, Suraj Sathyanrayana Rao
KEYWORDS:
Combined Post Tension and Post Compression, Prestress Concrete, Design of Bridges
JOURNAL NAME:
World Journal of Engineering and Technology,
Vol.6 No.4,
October
19,
2018
ABSTRACT: Starting from the ideas of Conventional Post Tensioning we present a heuristic argument of advantages of combined actions of post compression along with post tensioned technique for a PSC member through a Design Example. Our aim was to assess the characterization of a pre stressed member if it wasto be under the Load effects of post compressing a bar with post tensioned method through hydraulic jacks as the reinforcements in the tensioned zone of conventional PSC bridge were to be compressed in order to induce internal tensile stress similar to internal compressive stresses developed due to conventional post tensioned design. The results ultimately concluded that post compressing a Slender bar by a pre stressing force in the compression zone by a value equal to 0.1-0.7 times the pre stressing force in the tension zone would eventually lead to cancelling out of tensile and compressive stresses, thereby forming the desired section which is comparatively smaller in size but can account for sustainability. The anchorage at the top end wasprovided by special slender steel rods to eliminate the compressive stresses. All the dead loadswerecounteracted by the action of prestress and the bridge section was able to carry only live load which is deduced through examples in the article.