Basic variables	Statistics			Probability distribution
Basic variables	Mean	Standard deviation	Coefficient of variation	Probability distribution
Thickness of flange f_t	31.4 mm	1.57 mm	0.50	Normal
Overall depth of beam, h	635.8 mm	19.074 mm	0.03	Normal
Radius of gyration of beam section, r	263 mm	7.89 mm	0.03	Normal
Beam span, L	7000 mm	350 mm	0.05	Gumbel
Load ratio, α	1	-	-	Fixed
Imposed load on beam, q_k	25 kN/m	6.25 kN/m	0.25	Gumbel
Plastic modulus of beam section, W_pl	7,486,000 mm³	374,300 mm³	0.05	Normal
Design strength of beam, f_y	265 N/mm²	18.55 N/mm²	0.07	Lognormal
Cross section area of beam, A	30,300 mm²	909 mm²	0.03	Normal
Partial safety factor for material strength, γ_m	1.05	0.1575	0.15	Lognormal
Thickness of web, t_w	18.4 mm	0.552 mm	0.03	Normal
Depth of web, h_w	573 mm	17.19 mm	0.03	Normal
Moment of inertia of beam section, I_x	2,094,710,000 mm⁴	104,735,500 mm⁴	0.05	Normal
Modulus of elasticity of steel, E	210000 N/mm²	6300 N/mm²	0.03	Lognormal