Misprediction of long-time deflections of prestressed box girders: Causes, remedies and tendon layout effect

V. Křístek; L. Vráblík; Zdenek P Bazant; G. Hua Li; Q. Yu

Misprediction of long-time deflections of prestressed box girders: Causes, remedies and tendon layout effect

V. Křístek^*, L. Vráblík, Zdenek P Bazant, G. Hua Li, Q. Yu

^*Corresponding author for this work

Civil and Environmental Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

7 Scopus citations

Abstract

The paper reviews the causes of under-estimation of the long-time future deflections of large-span prestressed concrete box girder bridges. Six causes are discussed: 1) wrong creep and shrinkage model; 2) obsolete creep analysis method; 3) ignoring randomness; 4) lack of model updating based on short-time tests; 5) wrong tendon layout; and 6) neglect of shear lag. The present paper focuses on the last two causes, while a brief review of the other causes is planned for the conference presentation. So is a discussion of why the record-span Koror-Babeldaob Bridge in Palau deflected 1.1m more than expected in design.

Original language	English (US)
Title of host publication	Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures - Proceedings of the 8th Int. Conference on Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures
Pages	1291-1295
Number of pages	5
Volume	2
State	Published - Dec 1 2009
Event	8th International Conference on Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures - Ise-Shima, Japan Duration: Sep 30 2008 → Oct 2 2008

Other

Other	8th International Conference on Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures
Country/Territory	Japan
City	Ise-Shima
Period	9/30/08 → 10/2/08

ASJC Scopus subject areas

Civil and Structural Engineering
Mechanics of Materials

Cite this

Křístek, V., Vráblík, L., Bazant, Z. P., Li, G. H., & Yu, Q. (2009). Misprediction of long-time deflections of prestressed box girders: Causes, remedies and tendon layout effect. In Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures - Proceedings of the 8th Int. Conference on Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures (Vol. 2, pp. 1291-1295)

Křístek, V. ; Vráblík, L. ; Bazant, Zdenek P et al. / Misprediction of long-time deflections of prestressed box girders : Causes, remedies and tendon layout effect. Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures - Proceedings of the 8th Int. Conference on Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures. Vol. 2 2009. pp. 1291-1295

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abstract = "The paper reviews the causes of under-estimation of the long-time future deflections of large-span prestressed concrete box girder bridges. Six causes are discussed: 1) wrong creep and shrinkage model; 2) obsolete creep analysis method; 3) ignoring randomness; 4) lack of model updating based on short-time tests; 5) wrong tendon layout; and 6) neglect of shear lag. The present paper focuses on the last two causes, while a brief review of the other causes is planned for the conference presentation. So is a discussion of why the record-span Koror-Babeldaob Bridge in Palau deflected 1.1m more than expected in design.",

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Křístek, V, Vráblík, L, Bazant, ZP, Li, GH & Yu, Q 2009, Misprediction of long-time deflections of prestressed box girders: Causes, remedies and tendon layout effect. in Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures - Proceedings of the 8th Int. Conference on Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures. vol. 2, pp. 1291-1295, 8th International Conference on Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures, Ise-Shima, Japan, 9/30/08.

Misprediction of long-time deflections of prestressed box girders: Causes, remedies and tendon layout effect. / Křístek, V.; Vráblík, L.; Bazant, Zdenek P et al.
Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures - Proceedings of the 8th Int. Conference on Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures. Vol. 2 2009. p. 1291-1295.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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T2 - 8th International Conference on Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures

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AU - Vráblík, L.

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AB - The paper reviews the causes of under-estimation of the long-time future deflections of large-span prestressed concrete box girder bridges. Six causes are discussed: 1) wrong creep and shrinkage model; 2) obsolete creep analysis method; 3) ignoring randomness; 4) lack of model updating based on short-time tests; 5) wrong tendon layout; and 6) neglect of shear lag. The present paper focuses on the last two causes, while a brief review of the other causes is planned for the conference presentation. So is a discussion of why the record-span Koror-Babeldaob Bridge in Palau deflected 1.1m more than expected in design.

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Křístek V, Vráblík L, Bazant ZP, Li GH, Yu Q. Misprediction of long-time deflections of prestressed box girders: Causes, remedies and tendon layout effect. In Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures - Proceedings of the 8th Int. Conference on Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures. Vol. 2. 2009. p. 1291-1295

Misprediction of long-time deflections of prestressed box girders: Causes, remedies and tendon layout effect

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ASJC Scopus subject areas

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