Investigation of Poor Ride Quality in Steel-Bridge Girders Made Composite with Concrete Decks

Abstract

This case study focuses on excessive and undesired deformations that occurred during construction of newly rehabilitated steel bridges. The case study responds to problems with elevation control and subsequent ride quality problems exhibited in newly constructed or newly rehabilitated steel girder bridges made composite with concrete decks cast atop steel girders. Forensic investigations were performed on three bridges that had been in service for only a few years. These investigations discovered strong evidence that cantilevered portions of concrete decks were not supported adequately during construction loadings. The purpose of the case study is to identify causes for undesirable elevation profiles, and to recommend design and construction practices to help mitigate problems created for the highway users and extend the useful life of bridges.