Orthogonal Sensitivity Analysis of Prestressed Concrete Lining Stress of Water Conveyance Tunnel
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Abstract:
To evaluate the sensitivity of the prestressed concrete lining stress to the related factors, the stretching controlling stress ?con, friction coefficient between prestressed steel and channel wall ?, local deviation friction coefficient of strand channel k, and anchorage deformation and steel shrinking value a were selected as the sensitivity factors in this paper based on the background of Yellow River crossing tunnel project. The orthogonal experiment design method was used to determine the calculation scheme, and the stress state of wall concrete was calculated using the three-dimensional finite element method with different values assigning to the factors. The sensitivities of hoop stress and axial stress of the wall concrete to the four above factors were analyzed with the range analysis method. The orthogonal experiment results showed that the magnitude of sensitivities of hoop stress and axial stress of the wall concrete to the four factors under the conditions of completed strand tension and water filling reaching design water pressure is in the order of ?, ?con, a, and k, and especially ? and ?con have a significant impact on the hoop stress. Therefore, the value accuracy of the above two factors must be evaluated or validated by the experiments to ensure that the parameter values can reflect the real situation and the results of numerical calculation are reliable .
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