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Title:Precast Bridge Girder Details for Improved Performance
Authors:Nadim I. Wehbe and Michael Konrad
Publication Date:Dec 2017
Report #:MPC-17-340
Project #:MPC-439
TRID #:01658216
Keywords:bridge construction, deterioration, girders, load tests, longitudinal joints, precast concrete, prestressing, service life
Type:Research Report – MPC Publications

 

Abstract

Precast/prestressed double tee bridge girders are widely used for accelerated bridge construction on local roads in South Dakota. A common issue among existing double tee bridges in South Dakota is the rapid deterioration of longitudinal joints (shear keyways) between adjacent girders. Deteriorated joints allow moisture and deicing chemicals to reach the deck reinforcement, leading to premature corrosion of reinforcing steel and spalling of concrete. The structural performance of conventional and proposed longitudinal joints between precast double tee bridge girders was examined experimentally under cyclic and monotonic loading. Two 40-ft. long full-scale bridge superstructure specimens, each consisting of two joined double tee girders, were tested at the Lohr Structures Laboratory at South Dakota State University (SDSU). Each specimen represented two adjacent interior girders of a two-lane bridge having a width of an approximately 31 feet. The proposed continuous joint with overlapping steel mesh reinforcement in a grouted shear keyway exhibited substantially improved serviceability and strength performance characteristics over the conventional grouted joint with discrete welded connections.

How to Cite

Wehbe, Nadim I., and Michael Konrad. Precast Bridge Girder Details for Improved Performance, MPC-17-340. North Dakota State University - Upper Great Plains Transportation Institute, Fargo: Mountain-Plains Consortium, 2017.

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