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A practical creep model for concrete elements under eccentric compression
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Huang, Haidong, Garcia, Reyes, Huang, Shan-Shan, Guadagnini, Maurizio and Pilakoutas, Kypros (2019) A practical creep model for concrete elements under eccentric compression. Materials and Structures, 52 (6). 119. doi:10.1617/s11527-019-1432-z ISSN 1359-5997.
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Official URL: http://dx.doi.org/10.1617/s11527-019-1432-z
Abstract
Many prestressed concrete bridges are reported to suffer from excessive vertical deflections and cracking during their service life. Creep softens the structure significantly, and therefore an accurate prediction of creep is necessary to determine long-term deflections in elements under eccentric axial compression such as prestressed concrete girders. This study proposes a modification to the creep damage model of Model Code 2010 to account for the effect of load eccentricity. The modified creep model considers damage due to differential drying shrinkage. Initially, the creep behaviour of small scale concrete specimens under eccentric compression load is investigated experimentally. Twelve small-scale concrete prisms were subjected to eccentric axial loading to assess their shrinkage and creep behaviour. The main parameters investigated include the load eccentricity and exposure conditions. Based on the experimental results, an inverse analysis is conducted to determine the main parameters of the modified creep model. Subsequently, a numerical hygro-mechanical simulation is carried out to examine the effect of load eccentricity on the development of shrinkage and creep, and on the interaction between drying, damage and creep. The results indicate that eccentric loading leads to different tensile and compressive creep through the cross section, which contradicts the current design approach that assumes that tensile and compressive creep are identical. The proposed model also predicts accurately the long-term behaviour of tests on reinforced concrete elements available in the literature. This study contributes towards further understanding of the long-term behaviour of concrete structures, and towards the development of advanced creep models for the design/assessment of concrete structures.
Item Type: | Journal Article | ||||||
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Subjects: | T Technology > TG Bridge engineering | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||
Library of Congress Subject Headings (LCSH): | Concrete -- Testing, Concrete -- Creep, Prestressed concrete bridges -- Design and construction | ||||||
Journal or Publication Title: | Materials and Structures | ||||||
Publisher: | Springer | ||||||
ISSN: | 1359-5997 | ||||||
Official Date: | 10 December 2019 | ||||||
Dates: |
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Volume: | 52 | ||||||
Number: | 6 | ||||||
Article Number: | 119 | ||||||
DOI: | 10.1617/s11527-019-1432-z | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 23 December 2019 | ||||||
Date of first compliant Open Access: | 23 December 2019 |
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