Assessment of Temperature Evolution and Early-Age Thermal Cracking Risk in Segmental High-Strength Concrete Box Girder Diaphragms

Three-dimensional finite element (FE) thermal and stress models were created to compute the temperature evolution, thermal stress and potential of cracking in a segmental concrete box girder segment during construction. User-defined subroutines were developed in the ANSYS program to activate the deg...

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Bibliographic Details
Published in:KSCE journal of civil engineering 2022, 26(1), , pp.166-182
Main Authors: Do, Tu Anh, Tia, Mang, Nguyen, Thuan Huu, Hoang, Tuyet Thi, Tran, Tam Duc
Format: Article
Language:English
Subjects:
Adiabatic
Age
Box girder bridges
Box girders
Bridges
Cement hydration
Civil Engineering
Compressive strength
Concrete
Concrete mixes
Construction
Creep (materials)
Diaphragms
Engineering
Evolution
Geotechnical Engineering & Applied Earth Sciences
High strength concretes
Highway construction
Industrial Pollution Prevention
Insulating materials
Insulation
Material properties
Mathematical models
Risk
Segments
Stress analysis
Structural Engineering
Subroutines
Temperature differences
Temperature gradients
Tensile strength
Tensile stress
Thermal stress
토목공학
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Summary:Three-dimensional finite element (FE) thermal and stress models were created to compute the temperature evolution, thermal stress and potential of cracking in a segmental concrete box girder segment during construction. User-defined subroutines were developed in the ANSYS program to activate the degree of hydration-dependent heat rate and material properties, and creep behavior in the thermal and stress calculations. The developed FE model was verified with experimental measurements of a concrete cube. Adiabatic temperature rise, together with compressive strength and splitting tensile strength for a high-strength concrete mix typically used in construction of box girders were tested and incorporated in the subroutines. The effect of casting time and placement season (summer and winter), initial concrete temperature change, and insulation on the risk of cracking in a cast-in-situ box girder segment at early ages was investigated using the proposed model. The results indicate that the temperature difference between the segment’s middle and the gate corner is very large leading to a high cracking risk. Use of an insulation material such as blankets along with casting concrete at the nighttime would significantly lessen the thermal tensile stress and thus could reduce cracking risk in the segment.
ISSN:1226-7988
1976-3808
DOI:10.1007/s12205-021-2148-5