Methods to Develop Composite Action in Non-Composite Bridge

This thesis describes part of the work associated with TxDOT Study 0-4124 (“Methods to Develop Composite Action in Non-Composite Bridge Floor Systems”). The purpose of Study 0-4124 is to develop and verify at least one structurally adequate, constructible, and cost-effective method of achieving composite action using post-installed shear connectors. The primary objective of this thesis is to determine if using post-installed shear connectors to create composite action is a viable way of strengthening an existing bridge. A literature review was conducted to review and summarize composite action design and behavior, and a survey of existing TxDOT bridges that are non-composite steel girder and concrete bridge decks was performed. Methods of shear transfer were identified based on the background research and bridge survey, and 50 single connector, direct shear tests were performed on 22 primary methods and variations, of which 28 tests and 12 methods and variations will be discussed in this thesis. The results of the direct shear tests were compared to the cast-in-place welded stud based on expected load-slip demand. It was determined that three post-installed connection methods would meet the criteria of structural performance, constructability, and cost-effectiveness. Those methods are recommended for further testing in fatigue and in complete bridges.