COMPARISON OF INTERNAL & EXTERNAL PRESTRESSING IN PRESTRESSED CONCRETE BRIDGE

Abstract

In this research work, 3 span continuous Box Girder superstructure with external prestressing cable (one of the latest development in prestressed concrete technology) has been done. Prestressing is a technique in which highly stress cables/wires has been tensioned against concrete. Pre stressing can be classified as internal prestressing and external prestressing based on the positioning of cables/tendons. Internal Pre stressing is a technique in which Prestressing tendons are placed within the concrete section while in External Prestressing, tendons are placed outside the concrete section. The External Prestressing is mainly used in bridges and this technique is getting popular due to its various practical advantages such as increase in speed of construction and inspection, monitoring and replacement of tendons becomes simple in case of distress. . External prestressing technique is also adopted for strengthening of existing structures, construction of new bridges and as temporary ...