Testing of Full Scale Prestressed Beams to Key Performance

摘要

Adjacent box girder bridges use grouted shear keys to transfer load between211u001ebeams. These shear keys tend to crack and leak. A full-scale portion of an 211u001eadjacent box girder bridge was used to test the performance of grouted shear keys 211u001eunder environmental and cyclic loads. Strain gages were placed in the girders and 211u001ein the shear keys. Displacement gages were placed spanning the shear keys on the 211u001etop and bottom flanges of the girders. The bridge was subjected to simulated 211u001ecyclic truck loading as well as environmentally induced thermal loading. The 211u001epulse velocity method was employed to find cracks in shear keys. Dye penetration 211u001ewas used to confirm the pulse velocity measurements.