TR0003 (REV 10/98) TECHNICAL REPORT DOCUMENTATION PAGE STATE OF CALIFORNIA • DEPARTMENT OF TRANSPORTATION Reproduction of completed page authorized. 1. REPORT NUMBER CA16-2342 2. GOVERNMENT ASSOCIATION NUMBER 3. RECIPIENT'S CATALOG NUMBER 4. TITLE AND SUBTITLE Effects of Superstructure Creep and Shrinkage on Column Design in Posttensioned Concrete Box-Girder Bridges 5. REPORT DATE February 2017 6. PERFORMING ORGANIZATION CODE 7. AUTHOR Ebadollah Honarvar, Sri Sritharan, and Matt Rouse 8. PERFORMING ORGANIZATION REPORT NO. 9. PERFORMING ORGANIZATION NAME AND ADDRESS Department of Civil, Construction and Environmental Engineering Iowa State University 10. WORK UNIT NUMBER 11. CONTRACT OR GRANT NUMBER 65A0463 12. SPONSORING AGENCY AND ADDRESS California Department of Transportation Division of Engineering Services 1801 30th Street, MS #9-2/5i Sacramento, CA 95816 13. TYPE OF REPORT AND PERIOD COVERED Final Report June, 2012 – January, 2015 14. SPONSORING AGENCY CODE 913 15. SUPPLEMENTARY NOTES Prepared in cooperation with the State of California Department of Transportation 16. ABSTRACT During and after construction, cast-in-place posttensioned concrete box-girder bridges (CIP/PS Box) experience continuous movement primarily due to time-dependent shortening of the superstructure caused by creep and shrinkage. As a result, displacement-induced forces are developed in columns. These forces must be accurately estimated in order to ensure satisfactory performance of the bridge as well as to produce cost-effective design. When computer models are not used, California Department of Transportation (Caltrans) has adopted a simplified method (SM) to estimate the displacement-induced column forces, which has not been validated. This report systematically investigates the displacement-induced column forces using eight representative CIP/PS Box bridges using a combination of an experimental program and finite element analyses. It was found that Caltrans SM has deficiencies due to the estimation of strain rate and accurately accounting for concrete relaxation. Recommendations are presented to improve the Caltrans SM, thereby increasing the accuracy of calculated column design forces with due consideration to strain rate, concrete relaxation, and effects of column flexural cracking. 17. KEY WORDS Creep, Relaxation, Shrinkage, Posttensioned concrete, box-girder, bridge, Finite element, Displacement-induced, column, forces 18. DISTRIBUTION STATEMENT No restriction. This document is available to the public through the National Technical Information Service, Springfield, Virginia 22161 19. SECURITY CLASSIFICATION (of this report) Unclassified 20. NUMBER OF PAGES 159 21. COST OF REPORT CHARGED For individuals with sensory disabilities, this document is available in alternate formats. For information call (916) 654-6410 or TDD (916) 654-3880 or write Records and Forms Management, 1120 N Street, MS-89, Sacramento, CA 95814. ADA Notice
Effects of Superstructure Creep and Shrinkage on Column Design in Posttensioned Concrete Box-Girder Bridges
Jun 18, 2023
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Related Documents
