EM-Based Monitoring and Probabilistic Analysis of Prestress Loss of Bonded Tendons in PSC Beams

Table 4

Statistical properties of random variables.

Random variables	Unit	Mean	COV	Distribution	Sources
Uncertainty factor for creep model,	—	1	0.339	Normal	[18]
Uncertainty factor for shrinkage model,	—	1	0.451	Normal	[18]
Concrete strength,	MPa	63.9	0.089	Normal	[25]
Density of concrete,	kN/m^3	25.5	0.046	Normal	[26]
Initial stress in steel,	MPa	723 (PC1)	0.020	Normal	[27]
		977 (PC4)
Annual relative humidity,	%	75.0	0.161	Normal	Observed
Initial loading age,	d	30	0.110	Uniform	Assumed
Elastic modulus of prestressing steel,	MPa	1.95 × 10^5	0.060	Normal	[28]
Area of nonprestressed steel,	mm^2	565.5	0.035	Normal	[29]
Area of prestressed steel,	mm^2	140	0.0125	Normal	[30]