Prediction of Restraint Moments in Precast, Prestressed Structures Made Continuous

Ulla Kytölä; Anssi Laaksonen

doi:10.2478/ncr-2018-0016

Abstract

This paper studies restraint moments developing in simple-span precast, prestressed beams made continuous. Methods of evaluating restraint moments produced by creep and differential shrinkage are presented. Shrinkage and creep properties of composite structures, beam and deck parts were tested and compared to values defined according to Eurocode models. Finally, the restraint moments were calculated with both material models for the two-span parking deck structure. The study confirmed the findings of previous studies: that the methods that are used overestimate the negative restraint moment produced by differential shrinkage.

References

1. Finnish Concrete Society: “Concrete Textbook 2018, by201,” Vaasa, Finland, 2018, 568 pp. (In Finnish).
Search in Google Scholar Back to article
2. International Federation for Structural Concrete (fib): “CEB-FIP, Model Code 2010,” Final draft, Volume 1, Bulletin 65, Switzerland, 2012, 357 pp.
Search in Google Scholar Back to article
3. American Association of State Highway and Transportation Officials: “AASHTO LRFD Bridge Design Specifications, Customary U.S. Units,” Section 5, “Concrete Structures,” Washington DC, USA, 2012, 332-589 pp.
Search in Google Scholar Back to article
4. Miller R A, Castrodale R, Mirmiran A & Hastak M: “NCHRP Report 519, Connection of Simple Span Precast Concrete Girders for Continuity,” Transportation Research Board, Washington DC, 2004, 202 pp.
Search in Google Scholar Back to article
5. Abdalla O A, Ramirez J A & Lee R H, “Strand Deponding in Pretensioned Beams – Precast Prestressed Concrete Bridge Girders with Deponded Strands, Continuity Issues,” Purdue University, West Lafayette, Indiana, USA, 1993, 265 pp.10.5703/1288284314206
Search in Google Scholar Back to article
6. McDonagh M D & Hinkley K B, “Resolving Restraint Moments: Designing for Continuity in Prestressed Concrete Girder Bridges,” PCI Journal, July-August 2003, 16 pp.10.15554/pcij.07012003.104.119
Search in Google Scholar Back to article
7. Freyermuth C L: “Design of Continuous Highway Bridges with Precast, Prestressed Concrete Girders,” PCI Journal, April 1969, pp. 14-39.10.15554/pcij.04011969.14.39
Search in Google Scholar Back to article
8. Meyerson R, Weyers R E, Via C E, Mokarem D W & Lane D S: “Evaluation of Models for Predicting (Total) Creep of Prestressed Concrete Mixtures,” Virginia, USA, 2002, 55 pp.
Search in Google Scholar Back to article
9. “EN 1992-1-1, Eurocode 2: Design of Concrete Structures. Part 1-1: General rules for buildings,” Brussels, Belgium, 2004.
Search in Google Scholar Back to article
10. Bazant Z: “Mathematical Modeling of Creep and Shrinkage of Concrete,” Chapter 3, “Creep Analysis of Structures,” Chichester, New York, Brisbane, Toronto, Singapore, 1988, pp. 217-273.
Search in Google Scholar Back to article
11. ACI Committee 209: “Publication SP-76, Design for Creep & Shrinkage on Concrete Structures,” Chapter SP76-10, “Prediction of Creep, Shrinkage and Temperature Effects in Concrete Structures”, Detroit, USA, 1982, pp. 193-300.
Search in Google Scholar Back to article
12. Menn C: “Prestressed Concrete Bridges”, Basel, Boston, Berlin, 1990, 546 pp.10.1007/978-3-0348-9131-8
Search in Google Scholar Back to article
13. “EN 1992-2, Eurocode 2: Design of Concrete Structures. Concrete Bridges. Design and Detailing Rules,” Brussels, Belgium, 2005.
Search in Google Scholar Back to article
14. “EN 1992-2:2005/AC, Eurocode 2: Design of concrete structures. Concrete bridges. Design and Detailing Rules,” Brussels, Belgium, 2008.
Search in Google Scholar Back to article
15. Trost H: “Creep, Relaxation and Shrinkage of Structural Concrete,” IABSE reports, Switzerland, 1991, Vol. 62, pp. 59-76.
Search in Google Scholar Back to article
16. Trost H: “Auswirkungen des Superpositionsprinzips auf Kriech- und Relaxationsprobleme bei Beton und Spannbeton,” Beton- und Stahlbetonbau (Berlin – Wilmersdorf), No. 10, 1967, pp. 230-238 (in German).
Search in Google Scholar Back to article
17. Bazant Z: “Prediction of Concrete Creep Effects Using Age-Adjusted Effective Modulus Method,” Journal of the American Concrete Institute, Vol 69, 1972, p.p 212-21710.14359/11265
Search in Google Scholar Back to article
18. CEB: “Structural Effects of Time-Dependent Behaviour of Concrete,” Bulletin No. 215, Lausanne, Switzerland, 1993, 308 pp.
Search in Google Scholar Back to article
19. Keitel H: “Selecting an Advanced Creep Model or a Sophisticated Time-Integration? A new Approach by means of Sensitivity Analysis,” International Journal of Mathematical and Computational Sciences, Vol. 6, No. 7, 2012, pp. 724-731
Search in Google Scholar Back to article
20. International Federation for Structural Concrete (fib): “CEB-FIP, Model Code 2010,” Final draft, Volume 2, Bulletin 66, Lausanne, Switzerland, 2012, 377 pp.
Search in Google Scholar Back to article
21. Tadros M K, Girgis M A, Tuan C Y & Alex A A: “Simplified Design for Positive Restraint Continuity Moment in Bridge Girders.” PCI Journal, July-August 2018, pp. 62-78.10.15554/pcij63.4-04
Search in Google Scholar Back to article
22. Hendy C R & Smith D A: “Designer’s Guide to EN 1992-2, Eurocode 2: Design of Concrete Structures. Part 2: Concrete Bridges,” London, UK, 2007, 196 pp.
Search in Google Scholar Back to article
23. ACI Committee 209: “Publication SP-76, Design for Creep & Shrinkage on Concrete Structures,” Chapter SP76-13, “A Simple Method to Analyse Time-Dependent Forces Developed in Continous Concrete Structures” Detroit, USA, 1982, pp. 325-339
Search in Google Scholar Back to article
24. Betonikeskus Ry: “SCC – Self Consolidating Concrete,” Loviisa, Finland, 2004. (In Finnish).
Search in Google Scholar Back to article
25. “EN 12390-13, Testing Hardened Concrete, Part 13: Determination of Secant Modulus of Elasticity in Compression,” 2013.
Search in Google Scholar Back to article
26. Tia M, Liu Y & Brown D: “Modulus of Elasticity, Creep and Shrinkage of Concrete,” University of Florida, USA, 2005, 185 pp.
Search in Google Scholar Back to article
27. Mattock A H:”Precast-prestressed concrete bridges 5, Creep and Shrinkage studies,” Journal of the PCA Recearch Laboratories, Vol 2, No. 2, 1961, pp. 32-66.
Search in Google Scholar Back to article
28. Mirmiran A, Kulkarni S, Castrodale R, Miller R & Hastak M: “Nonlinear Continuity Analysis of Precast, Prestressed Concrete Girders with Cast-in-Place Decks and Diaphragms,” PCI Journal, September-October 2001, pp. 60-80.10.15554/pcij.09012001.60.80
Search in Google Scholar Back to article

Prediction of Restraint Moments in Precast, Prestressed Structures Made Continuous

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