Abstract
This paper presents an investigation of crack control in the large-area concrete slabs of terminal T2 of the Nanjing LuKou International Airport. The design and construction of large-area slabs established with a 170-m-long deformation seam at this terminal posed a design challenge. The analysis and control of the thermal stress was also important and presented various difficulties. This paper presents a basic distribution of the floor’s temperature stress based on analysis with the finite element method (FEM). According to the FEM analysis, the maximum values of the tensile stress are between 2 and 3 MPa in most regions of the first slab. The top floor and shear wall should receive additional attention with regard to design and construction. Furthermore, field monitoring was also conducted using an advanced basalt fiber-optic sensor. The results of this monitoring were validated using data obtained from traditional strain gauges. The monitoring data indicated that the maximum value of the tension strain was 400 με in the #3 bar and #4 bar of the first slab. Then, the shrinkage was increased, and the maximum value of the deformation was recorded as approximately −450 με. Throughout the theoretical calculations, the shrinkage stress was found to exhibit a maximum of 1.5 MPa at approximately 10 days, which means that the section had achieved a safe state. The internal stress distribution state was analyzed, and the crack-control measures were validated.
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Acknowledgements
The authors would like to acknowledge the support of the Key Laboratory of Concrete & Prestressed Concrete Structure of the Ministry of Education of PRC, the National Sci-Tech Support Plan of Key Technology Research and Demonstration Program on Green Buildings (2012BAJ03B0602) and the support of a project funded by the Priority Academic Program Development of the Jiangsu Higher Education Institutions (PAPD). The research work presented herein is also supported by the Fundamental Research Funds for the Central Universities and Colleges and Universities in Jiangsu Province Plans for Graduate Research and Innovation (KYLX15_0091), for which we are grateful.
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Liu, J., Qin, W., Zhao, D. et al. Investigating crack control in the mega-size concrete floors of an airport terminal. Int J Civ Eng 15, 1203–1213 (2017). https://doi.org/10.1007/s40999-016-0135-x
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DOI: https://doi.org/10.1007/s40999-016-0135-x