Evaluation of the Mechanism and Influence Parameters of the Core Concrete Debonding in the Concrete-Filled Steel Tube

Yue Chen; Gang Wang; Xiaobin Hao; Guihai Yan

doi:10.13206/j.gjgS21110501

Volume 37 Issue 7

Oct. 2022

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Yue Chen, Gang Wang, Xiaobin Hao, Guihai Yan. Evaluation of the Mechanism and Influence Parameters of the Core Concrete Debonding in the Concrete-Filled Steel Tube[J]. STEEL CONSTRUCTION(Chinese & English), 2022, 37(7): 20-30. doi: 10.13206/j.gjgS21110501

Citation:

Yue Chen, Gang Wang, Xiaobin Hao, Guihai Yan. Evaluation of the Mechanism and Influence Parameters of the Core Concrete Debonding in the Concrete-Filled Steel Tube[J]. STEEL CONSTRUCTION(Chinese & English), 2022, 37(7): 20-30. doi: 10.13206/j.gjgS21110501

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Evaluation of the Mechanism and Influence Parameters of the Core Concrete Debonding in the Concrete-Filled Steel Tube

doi: 10.13206/j.gjgS21110501

1. Central Research Institute of Building and Construction (Shenzhen) Co., Ltd., Shenzhen 518055, China;
2. Central Research Institute of Building and Construction Co., Ltd., MCC Group, Beijing 100088, China

Received Date: 2021-11-05
Available Online: 2022-10-28

Abstract

Abstract

The concrete-filled steel tube(CFST) combines the structural and mechanical properties of both steel pipe and concrete and are widely used in high-rise buildings as well as bridge structures. Over time, the steel pipe and the core concrete will deform, including elastic deformation, creep, and concrete shrinkage. Due to the material difference of the concrete and steel, the deformation difference between the two materials in steel pipe and concrete eventually leads to debonding, which affects the service performance of the overall structure. In order to investigate the estimation method of debonding of CFST in service life, this paper explored the applicability and accuracy of the calculation model for estimating debonding of CFST by calculating the deformation of core concrete and steel pipe separately and deriving the amount of debonding and comparing it with the measured values of it in Shenzhen Saige Plaza Building.
In CFST, the radial deformation is mainly divided into two parts:the shrinkage, Poisson deformation and creep of the core concrete, and Poisson deformation and creep for the steel tubes. Due to the hermetic condition, a constant temperature and humidity was assumed inside the steel pipe. On this basis, two commonly used concrete code ACI 209 R-92 and CEB-FIP were adopted in this work. And the shrinkage, Poisson's and creep of the concrete were calculated with the calculation time from the completion date of the building to the testing date, and the design load and self-weight as the stress conditions. The steel pipe was analyzed for stress and the corresponding deformation was calculated with the material mechanics. The sum of different deformations was calculated as the amount of debonding in the CFST with the positive direction of debonding growth.
The results show that the calculated values of CEB-FIP are closer to the measured ones compared to the ACI model. In particular, the estimation of shrinkage of core concrete by CEB-FIP model is generally larger than that of ACI model; in terms of creep variation, ACI model is more influenced by size of the concrete and the amount of creep is smaller than that of CEB-FIP model. Both conventional concrete compacted by pounding and self-compacting concrete were used in the CFST of Saige Tower. Compared with the conventional concrete, the self-compacting concrete undergoes larger shrinkage deformation, which is well reflected in the results of both models, and the results of CEB-FIP are closer to its described in the manual. The measured values show a "small-large-small" distribution of core concrete debonding from top to bottom, and the CEB-FIP calculation is consistent with this trend, while the ACI results show a decreasing trend from top to bottom.
- concrete-filled steel tube(CFST),
- debonding,
- CEB-FIP 2010 model,
- ACI 209R-92

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References(32)

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