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Computers and Concrete Volume 35, Number 2, February 2025 , pages 137-153 DOI: https://doi.org/10.12989/cac.2025.35.2.137 |
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An evaluation of the stress redistribution of concrete cable-stayed bridges due to creep, shrinkage, and relaxation effects |
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Tien-Thang Hong, Seung-Eock Kim and Duc-Kien Thai
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| Abstract | ||
| The objective of this investigation is to determine the stress redistribution due to the cable stress relaxation, concrete creep and shrinkage of structural members in a concrete cable-stayed bridge. To accomplish such complex analyses, the generalized Maxwell model is used for the cable stress relaxation model of the cable members, whereas the models used for the shrinkage and creep are based on the ACI 209R-92 design code. A computational program is developed to calculate the parameters for the generalized Maxwell model, whereas ABAQUS user subroutines are established to simulate the shrinkage and creep behaviors of concrete members. All the processes are set up as an evaluation system for practical usage. The influence of these factors as well as the simultaneous influence of different factors on the stress redistribution are investigated and evaluated. Moreover, the effect of cable type on stress redistribution is also investigated. The findings of these investigations reveal that the stress values in cable elements increased up to 9.63%, and the redistribution rate increased by up to 34.04% in girder elements and 87.17% in pylon elements. Concrete creep and shrinkage increase the rates of redistribution in structural members, particularly pylons. The findings also show that the cable type with low relaxation rates should be used to minimize the effect of cable stress relaxations. | ||
| Key Words | ||
| cable-stayed bridge; cable stress relaxation; concrete creep; concrete shrinkage; stress redistribution | ||
| Address | ||
| Tien-Thang Hong: 1) Faculty of Civil Engineering, Thuyloi University, 175 Tayson, Hanoi, Vietnam, 2) Department of Civil and Environmental Engineering, Sejong University, 98 Gunja-dong, Gwangjin-gu, Seoul 05006, South Korea Seung-Eock Kim and Duc-Kien Thai: Department of Civil and Environmental Engineering, Sejong University, 98 Gunja-dong, Gwangjin-gu, Seoul 05006, South Korea | ||