Author : Carlos Victor Aguilar
Publisher :
ISBN 13 :
Total Pages : 318 pages
Book Rating : 4.:/5 (958 download)
Book Synopsis Evaluation and Load Rating of a Prestressed Concrete Double T-beam Bridge and a Prestressed Concrete I-girder Bridge Without Design Plans by : Carlos Victor Aguilar
Download or read book Evaluation and Load Rating of a Prestressed Concrete Double T-beam Bridge and a Prestressed Concrete I-girder Bridge Without Design Plans written by Carlos Victor Aguilar and published by . This book was released on 2015 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridges without design plans are an existing problem as conventional load rating techniques cannot be utilized when there is no design documentation available to indicate the amount and location of reinforcement. A project was conducted for the New Mexico Department of Transportation to evaluate bridges without plans with various superstructures (T-beam, I-girder, and box girder) using advanced structural analysis and non-destructive experimental methods, with the goal of developing specific load rating procedures. This study presents two of the bridges that were evaluated. Bridge 7701 is a prestressed concrete double T-beam bridge located in Doña Ana County, NM. Upon inspection, it was discovered that many of the shear keys connecting the bridge beams were damaged or missing. Prestressing strand estimates were made based on Magnel diagrams and verified with a Hilti Ferroscan system. Diagnostic load testing was performed to determine the impact of the damaged shear keys on the live load distribution of the bridge. The results were then used to plan and conduct a proof test. Final legal load rating factors were subsequently determined from the proof test, and compared with the results from an AASHTOWare BrR load rating analysis. The final load rating factors show that Bridge 7701 needs to be load posted. Bridge 8588 is a prestressed concrete I-girder bridge located in Eddy County, NM. Similar to Bridge 7701, Magnel diagrams were used to develop prestressing strand estimates (based on composite and non-composite behavior) and attempts were made to verify layouts using a Hilti Ferroscan system. Since no significant girder damage was found during the inspection, no diagnostic load test was performed. Only a proof test was conducted and the results were used to compute load rating factors. The factors from the proof test were subsequently checked with the AASHTOWare BrR results, and final legal load rating factors were determined showing that Bridge 8588 does not need to be load posted. Using the evaluation procedures developed for Bridges 7701 and 8588, as well as three other bridges that were separately evaluated in this project, a final implementation plan for load rating prestressed concrete bridges without plans is presented.
