Dynamic Stability Evaluation of a New Type Bi-prestressing Girder Bridge

In this paper, a new type of a prestressed concrete girder using an unique bi-prestressing technique in which an additional tensile stress is applied to the upper part of a section to enhance the efficiency of the section is introduced, and the results of the dynamic stability analyses on a bridge using the new type girder are presented. The additional tensile force in the upper part of a section can be introduced by inserting a pin bar with a wedge-like section into the gap between two steel bars pre-installed in the girder. Using a commercial finite element analysis program, the dynamic stability evaluation is performed on three bridges with span lengths of 30m, 35m, and 40m. The results of the analyses show that all bridges satisfy the limits provided in the design specifications to ensure structural stability, driving safety, ride quality, etc.