Continuity of Precast Bridge U-Girders Connected to a Cast-in-Place Substructure Subjected to Seismic Loads

Abstract eng:
It is critical in high seismic regions to have full connectivity between the girders and the support columns to transfer the high seismic forces. Using precast girders for the superstructure allows for better construction tolerances and quicker construction methods. The purpose of this study is to develop and examine integral connection details between precast U-Girders and cast-in-place substructures subjected to longitudinal seismic loading. Analytical modeling and experimental cyclic testing of four, 40 percent precast U-girder specimens are used to investigate the behavior of the connections. This study primarily investigates the effect of post-tensioning on the connection performance. Analytical and experimental results show benefits to longitudinal post-tensioning in respect to joint detailing and system continuity which aren’t considered in current design methods. Additionally, potential local joint cracking problems need to be addressed in joint design methods.

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