Prediction of Restraint Moments in Precast, Prestressed Structures Made Continuous

Author:

Kytölä Ulla1,Laaksonen Anssi2

Affiliation:

1. Ph.D. student Dept. of Civil Engineering , Tampere University of Technology , Korkeakoulunkatu 5, FI-33720 Tampere

2. Professor Dept. of Civil Engineering , Tampere University of Technology Korkeakoulunkatu 5, FI-33720 Tampere

Abstract

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.

Publisher

Walter de Gruyter GmbH

Reference28 articles.

1. 1. Finnish Concrete Society: “Concrete Textbook 2018, by201,” Vaasa, Finland, 2018, 568 pp. (In Finnish).

2. 2. International Federation for Structural Concrete (fib): “CEB-FIP, Model Code 2010,” Final draft, Volume 1, Bulletin 65, Switzerland, 2012, 357 pp.

3. 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.

4. 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.

5. 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

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