Performance of Posttensioned Curved-Strand Connections in Transverse Joints of Precast Deck Panels: Fid-Bau Portal

Performance of Posttensioned Curved-Strand Connections in Transverse Joints of Precast Deck Panels

Wells, Zane G. / Barr, Paul J. / James, Patrick H.

Abstract

Accelerated bridge construction techniques have resulted in state-of-the-art options that save time and money during the construction of new or existing bridges. One such group of techniques that has generated considerable interest is the use of precast-concrete deck panels. Using precast-concrete deck panels allows for off-site curing, thus eliminating long delays from formwork construction and concrete curing time. Despite the benefits, problems can develop as a result of the inherent joints between the individual panels. These joints are locations for potential leakage, which can result in corrosion or inadequate long-term performance. Posttensioning the precast deck panels helps to eliminate leakage, but conventional longitudinal posttensioning systems require complete deck replacement in the event of a single faulty deck panel. The proposed posttensioned curved-strand connection presented in this paper allows for single-panel replacement. The capacity of the proposed curved-strand connection was investigated to compare its behavior with that of other systems currently in use. The curved-strand connection was found to be comparable to a standard posttensioning system. The ultimate capacity of the curved-strand connection in negative bending was found to be 97% of the standard posttensioning connection.