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Shear Behavior of Spliced Post-tensioned Girders With Ungrouted Tendons: Final Report
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2022-09-01
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[PDF-11.43 MB]
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Edition:Final Report, May 2019, May 2022
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Abstract:This experimental study was developed to evaluate the shear performance of spliced post-tensioned girders with grouted and ungrouted ducts. Demand for expedited construction processes and increased girder spans make spliced girder systems attractive options for medium- to long-span bridges. Since the spliced girder elements are subjected to significant shear forces, it is required to check the shear capacity of post-tensioned girders containing grouted and ungrouted ducts. The current shear design provisions in the American Association of State Highway and Transportation Officials Load and Resistance Factor Design (AASHTO LRFD) Bridge Design Specifications include shear strength reduction factors to account for the presence of the duct in the web and its condition (i.e., grouted or ungrouted). These factors are applied to the shear resistance provided by the concrete component, as well as to the shear resistance provided by the shear reinforcement. The reduction factors in AASHTO LRFD were developed from a limited database that did not include ungrouted post-tensioning systems, resulting in incomplete code specifications. This lack of knowledge served as the motivation for this study. The experimental program involved the design and test of six large-scale specimens incorporating the following main variables: (ⅰ) three different duct layouts (straight, parabolic, and hybrid) and (ⅱ) the utilization of grouted and ungrouted ducts. Two tests were performed on each specimen, resulting in a total of twelve tests. All tests resulted in similar failure modes, such as localized web crushing at the duct area in the critical section, regardless of duct filler and tendons profile. Additionally, the normalized shear stress values were similar for the grouted and ungrouted specimens. These tests serve as validation studies for the updated shear strength reduction factors proposed for implementation in AASHTO LRFD.
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