In the freeze-thaw zone, the pre-stressed concrete of bridge structure will be damaged by freezing-thawing, the bearing capacity of structure will decrease and the safety will be affected. The purpose of this paper is to establish the time-dependent resistance degradation model of structure in the freeze-thaw zone, and analysis the structural reliability and remaining service life in different freeze-thaw zones.
First, according to the theory of structural design, a calculation model of the resistance of pre-stressed concrete structures in f freeze-thaw zone is established. Second, the time-dependent resistance model was verified by the test beam bending failure test results done by the research group, which has been in service for 20 years in freeze-thaw zone. Third, using JC algorithm in MATLAB to calculate the index on the reliability of pre-stressed concrete structure in frozen thawed zones, forecasting the s remaining service life of structure.
First, the calculation model of the resistance of pre-stressed concrete structures in freeze-thaw zone is accurate and it has excellent applicability. Second, the structural resistance deterioration time in Wet-Warm-Frozen Zone is the earliest. Third, once the pre-stressed reinforcement rusts, the structural reliability index will reach limit value quickly. Finally, the remaining service life of structure meets the designed expectation value only in a few of freeze-thaw zones in China.
The research will provide a reference for the design on the durability of a pre-stressed concrete structure in the freeze-thaw zone. In order to verify the security of pre-stressed concrete structures in the freeze-thaw zone, engineers can use the model presented in this paper for durability checking, it has an important significance.
Conflict of interest: the authors declare that there are no conflicts of interest regarding the publication of this paper.
This study was supported by the Fundamental Research Funds for the Central Universities (No. 2572017AB01), Natural Science Foundation of Heilongjiang Province of China (No. E2017003) and Transportation Science and Technology Project of Liaoning Province of China (Nos 201512 and 201513).
Liu, J., Jia, Y., Zhang, G. and Wang, J. (2018), "Research on resistance degradation and reliability of pre-stressed concrete structures in freeze-thaw zone", International Journal of Structural Integrity, Vol. 9 No. 4, pp. 442-454. https://doi.org/10.1108/IJSI-07-2017-0044Download as .RIS
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