Table 1.
Cement performance index parameters.
Table 2.
Laboratory mix ratio.
Fig 1.
MTS-810 material testing machine.
Table 3.
Technical indexes of DS5-8A full information AE signal analyzer.
Fig 2.
Fixed position of strain gauge and sensor.
(a) Front view. (b) Side view. (c) Top view.
Table 4.
Single-stage cyclic load for fatigue test.
Fig 3.
Typical acoustic emission burst signal.
Table 5.
Fatigue test scheme of concrete beam.
Table 6.
Bending resistance of concrete beams.
Fig 4.
Weibull distribution test for bending fatigue life of specimens.
(a) S = 0.85. (b) S = 0.75. (c) S = 0.65.
Table 7.
Weibull distribution test for bending fatigue life of specimens.
Table 8.
Regression parameter results.
Fig 5.
The relationship curve between fatigue life and stress level with different failure probability.
Table 9.
Residual strength under single stage loading (failure probability P = 0.50, S = 0.85, 0.75, 0.65).
Fig 6.
Relative damage strength at different stress levels and test of evolution equation.
(a) S = 0.85. (b) S = 0.75. (c) S = 0.65.
Table 10.
Damage evolution equation test under different stress levels.
Table 11.
Regression parameter results.
Fig 7.
Fitting curve of relative damage strength at different stress levels.
Fig 8.
Fitting curve of strength relative damage at different stress levels.
(a) S = 0.85. (b) S = 0.75. (c) S = 0.65.
Table 12.
Regression parameter results.
Table 13.
Test results of flexural fatigue damage of concrete under two-stage loading (high-low order).
Table 14.
Test results of flexural fatigue damage of concrete under two-stage loading (low-high order).
Table 15.
Test results of flexural fatigue damage of concrete under three-stage loading (high-low order).
Table 16.
Test results of flexural fatigue damage of concrete under three-stage loading (low-high order).
Fig 9.
Schematic diagram of fatigue damage development path.
Table 17.
Calculation and verification of fatigue cumulative damage model.