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Table 4 Random variables and statistical data.

From: Reliability Assessment of HFRC Slabs Against Projectile Impact

Random variable

Nominal

Bias factor

Coefficient of variation (COV)

Distribution

References

HFRC slab

 Concrete density, \(\rho_{c}\) (kg/m3)

2500

1.05

0.10

Lognormal

Choudhury et al. (2002)

 Concrete strength, \(f_{c}^{'}\) (MPa)

Variable

1.10

0.10

Lognormal

Siddiqui et al. (2014b)

 Thickness of slab, H (mm)

90

1.00

0.05

Normal

Choudhury et al. (2002)

 Reinforcement ratio, r (%)

0.708

1.10

0.10

Normal

Siddiqui et al. (2014b)

 Steel rebar spacing, cr (mm)

100

0.90

0.05

Lognormal

Assumed

 Reinforcing index, RIv

Estimateda

1.10

0.12

Lognormal

Assumed

Projectile

 Mass of the projectile, M (kg)

0.8

1.10

0.05

Lognormal

Penmetsa (2005)

 Diameter of the projectile, d (mm)

40

1.05

0.05

Normal

Penmetsa (2005)

 Impact velocity, V0 (m/s)

Variable

0.90

0.10

Extreme type I

Choudhury et al. (2002)

  1. aNominal value was estimated using Eq. (6).