Understanding the Behavior of Prestressed Girders after Years of Service
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2016-12-31
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TRIS Online Accession Number:01667627
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Edition:Final Report
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Abstract:A comprehensive study including detailed analysis and shear testing to failure was conducted on two AASHTO Type II girders obtained from the I-244 bridge over the Arkansas River in Tulsa after approximately 47 years in service. Small-scale girders with a matching design were also tested individually and as a composite bridge section to evaluate the effects of composite behavior in resisting shear. Additionally, a number of inverse techniques and non-destructive testing methods were evaluated to determine their applicability for determining material properties and detecting damage in prestressed concrete bridges. In all shear tests of the two full-size girders, the applied loads exceeded expected loads whether determined from shear capacity calculations, flexural capacity by strain compatibility, or design demands from AASHTO LRFD. Tests of the individual and composite small-scale girders indicated a significant increase in load carrying capacity for girders within a composite bridge section. A simple yet effective 1-D model was established to predict time dependent behaviors of pretensioned concrete and improvements were made to the backbone technique used for processing free vibration response data for nonlinear system identification and damage detection purposes through this project. The overall research provided important information on the structural and composite behavior of aged prestressed girder bridges critical to shear and on methods for identifying properties of aged members, structural health monitoring, and damage detection.
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Content Notes:FINAL REPORT ~ FHWA-OK-16-03 ODOT SP&R ITEM NUMBER 2256
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