Research Article
Improved Deflection Prediction Model for PSC Box Girder with Stay Cable System during Tensioning Phase
Table 2
Statistical properties of random variables.
| Variable | Properties | Distribution | Mean | COV | Source |
| DLA | Dynamic load amplification/X1 | Normal | 1.0899 | 0.0279 | GBT 50283-1999 [24] | KSQ | Ratio of maximum measured value to design value/X2 | Extremum І type | 0.7995 | 0.0862 |
| α1 | Creep uncertainty coefficient/X3 | Normal | 1.000 | 0.34 | Pan et al. [25] | α2 | Shrinkage uncertainty coefficient/X4 | Normal | 1.000 | 0.45 |
| fcm28 (MPa) | Compressive strength (28 days)/X5 | Normal | 49.2 | 0.066 | Yang [1] |
| Ec28 (MPa) | Elastic modulus of concrete (28 days)/X6 | Normal | 34,500 | 0.04 | Guo et al. [26] | DW1 (kN/m3) | Density of concrete/X7 | Normal | 26.5 | 0.215 |
| T (°C) | Annual mean temperature/X8 | Normal | 23.9 | 0.341 | CMDC [27] | RH (%) | Annual relative humidity/X9 | Normal | 70.9 | 0.175 |
| fpy (MPa) | Yield strength/X10 | Normal | 1636.8 | 0.025 | AL-Harthy et al. [28] | σcon (MPa) | Prestressed tension control stress/X11 | Normal | 1,395 | 0.040 |
| σs2 (MPa) | Anchorage deflection, reinforcement retraction, and joint compression/X12 | Normal | 5.549 | 0.175 | Fan et al. [29] |
| μ | Friction coefficient/X13 | Normal | 0.18 | 0.299 | Pan [5] | k | Friction influence coefficient/X14 | Normal | 0.003 | 0.553 |
| Cs (kg/m3) | Surface chloride concentration/X15 | Normal | 15 | 0.2 | Val et al. [30] | Ccr (kg/m3) | Critical chloride concentration/X16 | Normal | 2.0 | 0.2 | D (cm2/year) | Diffusion coefficient/X17 | Lognormal | 0.631 | 0.2 |
| icorr (μA/cm2) | Corrosion current density/X18 | Normal | 1.0 | 0.2 | González et al. [31] |
| R | Permeability ratio/X19 | Normal | 3.0 | 0.33 | Stewart et al. [32] |
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