Design of a Post-tensioned Concrete Bridge

Abstract

This Master s Thesis covers topic of designing a post-tensioned concrete bridge. The total length of the bridge is 73 m and it is divided into 3 spans: two spans, which length of each is 22,5 m and one span, which length is 28 m. In the middle, the beam is monolithically connected with 2 columns, which heights are 14 m and 12 m. Next two columns are located at the ends of beam and their height is 2 m. The cross-section of the bridge is designed as a massive T-beam. Its width is 8,5 m and height is 1,3 m.

The bridge is post-tensioned in longitudinal direction. The main idea of this Master s Thesis is to control if the post-tensioning system adopted in the construction in cooperation with minimum amount of reinforcing steel in longitudinal direction is enough to transfer the load to foundation. The number of prestressing tendons has been determined.

Static model, load cases and combinations have been entered to Autodesk Robot Structural Analysis. The Master s Thesis contains analyses for ultimate limit state and serviceability limit state in chosen cross-sections.

Calculations are based on standards such as Eurocodes. There are taken into consideration Polish Annexes to mentioned standards.