Title:
Strength and Serviceability of Shear-Critical Post-Tensioned Girders (Open Source)
Author(s):
Sangyoung Han, Jarrod Zaborac, Jongkwon Choi, Anca C. Ferche, and Oguzhan Bayrak
Publication:
Structural Journal
Volume:
121
Issue:
5
Appears on pages(s):
19-36
Keywords:
AASHTO LRFD; flexible filler; post-tensioned concrete member; post-tensioning; prestressed I-girder; shear; spliced precast girder.
DOI:
10.14359/51740847
Date:
9/1/2024
Abstract:
The results of an experimental program conducted to evaluate the
performance of shear-critical post-tensioned I-girders with grouted
and ungrouted ducts are presented. The experimental program
involved the design, construction, and testing to failure of six fullscale specimens with different duct layouts (straight, parabolic,
or hybrid) and using both grouted or ungrouted ducts. All tests
resulted in similar failure modes, such as localized web crushing in
the vicinity of the duct, regardless of the duct condition or layout.
Furthermore, the normalized shear stresses at ultimate were
similar for the grouted and ungrouted specimens. The current shear
design provisions in the AASHTO LRFD Bridge Design Specifications (AASHTO LRFD) were reviewed, and updated shear-strength reduction factors to account for the presence of the duct in the web and its condition (that is, grouted or ungrouted) were proposed. The data generated from these tests served as the foundation for updated shear-strength reduction factors proposed for implementation in AASHTO LRFD.