Author : Richard A. Miller (Professional engineer)
Publisher :
ISBN 13 :
Total Pages : 110 pages
Book Rating : 4.3/5 (555 download)
Book Synopsis Testing of Full Scale Prestressed Beams to Evaluate Shear Key Performance by : Richard A. Miller (Professional engineer)
Download or read book Testing of Full Scale Prestressed Beams to Evaluate Shear Key Performance written by Richard A. Miller (Professional engineer) and published by . This book was released on 1998 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adjacent box girder bridges use grouted shear keys to transfer load between beams. These shear keys tend to crack and leak. A full-scale portion of an adjacent box girder bridge was used to test the performance of grouted shear keys under environmental and cyclic loads. Strain gages were placed in the girders and in the shear keys. Displacement gages were placed spanning the shear keys on the top and bottom flanges of the girders. The bridge was subjected to simulated cyclic truck loading as well as environmentally induced thermal loading. The pulse velocity method was employed to find cracks in shear keys. Dye penetration was used to confirm the pulse velocity measurements. The total research project consisted of: (a) testing of the current keyway detail using the currently specified nonshrink grout, (b) testing of the current keyway detail but substituting epoxy grout for the nonshrink grout, and (c) testing of a modified keyway detail using nonshrink grout in which the keyway is moved to the neutral axis of the girder. In the first test, the shear keys were grouted in late autumn and cracked soon after casting, before any simulated vehicle loading had been applied.