Development of an Efficient Steel Beam Section for Modular Construction Based on Six-Sigma

Table 4

CTQ definitions and target levels.

CTQ	Definition	Measuring method	⁢Current level		Target level
			Built-up RHS	Channel
Welding length per unit length	Welding length per 1 m beam length	Measuring welding length	4	0	Less than 2
Moment of inertia per sectional area of beam	Moment of inertia divided by sectional area of beam	Calculation of moment of inertia and sectional area of beams	127 cm^2; (7.5 m span)	132 cm^2; (7.5 m span)	Larger than 150 cm^2; (7.5 m span)
Weight of floor beams per unit area of plan	Total weight of beams used for modules divided by plan area of module	Calculation of weight of beams after redesign of modules	0.30 kN/m^2; (7.5 m span)	0.25 kN/m^2; (7.5 m span)	Less than 0.28 kN/m^2; (7.5 m span)