Abstract
To provide reasonable guidance for CFST practical structures in design and construction, shrinkage test of concrete-filled steel tube (CFST) members in natural environments was presented. In order to acquire some knowledge regarding the influence of the interaction between the steel tube and core concrete during concrete shrinkage, ordinary concrete (OC) specimens exposed to the atmosphere were also performed in this test. The experimental results have been compared with predicted shrinkage strains obtained from the CEB-FIP1990 model, B3 model, GL2000 model, ACI 209 model. The research results show that the measured shrinkage strains of CFST specimens presents characteristics of seasonal variation under the influence of natural environments. Although expansive additive is added in the concrete mix, there is still strain difference between the steel tube and core concrete. The influence of steel ratio on the shrinkage behavior of CFST is unclear. The value of CFST shrinkage strain is about 50% of the OC shrinkage strain. For the early-age shrinkage of CFST, the predicted result by the ACI209 model is better than the other three models. The CEB-FIP1990 model is recommended to be used to predict the long-term shrinkage behavior of CFST.
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