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Customers’ required quality | Quality characteristic |
Price of beams | Contribution to competitiveness of modules | Structural performance of bema | Quality of manufacturing | Absolute priority | Priority ratios | Ratings |
Surface area per unit length | Welding length per unit length | Span length | Thickness of webs | Diameter of web opening | Number of webs | Thickness of flanges | Number of openings | Height of ceiling and floor beams | Weight of floor beams per unit area of plan | Moment of inertia per sectional area of beam | Section modulus per sectional area of beam | Lever arm of bolts at the end plate | Number of axes of symmetry | Radius of curved section |
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Low cost of beams | | | | | | | | | | | | | | | | | | |
Small steel quantity | | | | ○ | | ○ | △ | | | ◎ | ◎ | ○ | | | | 7.7 | 10% | 2 |
Low manufacturing cost | ○ | ◎ | | | ○ | | | ○ | | | | | | | | 13.1 | 17% | 1 |
Easy design of modular building | | | | | | | | | | | | | | | | | | |
Easy structural design | | | ◎ | | | | | | | | ◎ | ○ | ◎ | | | 4.3 | 5% | 7 |
Easy architectural design | ◎ | | ◎ | | ○ | | | ○ | ○ | ◎ | | | | ○ | ○ | 4.3 | 5% | 7 |
Easy fabrication and transportation | | | | | | | | | | | | | | | | | | |
Easy connection | | | | ◎ | | | ◎ | | | | | | ◎ | | ○ | 4.3 | 5% | 7 |
Transportation with low-bed trailer | | | | | | | | | ◎ | | | | ○ | | | 4.7 | 6% | 5 |
Transportation with cargo truck | | | | | | | | | ◎ | | | | ○ | | | 3 | 4% | 15 |
Easy installation of plumbing equipment | | | | | ◎ | | | ◎ | | | | | | | | 4.4 | 6% | 6 |
Short time for stocking | | | | | | | | | | | | | | | | | | |
A short time for stocking after order | ○ | ◎ | | | | | | ○ | | | | | | | | 6 | 8% | 4 |
The stock is secured in advance | | | ◎ | | | | | | | | | | | | | 4.3 | 5% | 7 |
High quality of manufacturing | | | | | | | | | | | | | | | | | | |
Small manufacturing deformation | | ○ | | | | ◎ | | | | | | | | ◎ | | 7.4 | 9% | 3 |
Less surface defects | | | | | | | | | | | | | | | ○ | 4 | 5% | 12 |
Easy application of high-strength steel | ◎ | | | | | | | | | ◎ | | | | | ○ | 3.3 | 4% | 14 |
Structural performance | | | | | | | | | | | | | | | | | | |
Structural safety | | | | | | | | | | | ◎ | ◎ | | | | 4 | 5% | 12 |
Small floor vibration | | | | | | | | | ○ | | ◎ | | | | | 4.2 | 5% | 11 |
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Absolute priority | 126 | 194 | 116 | 62 | 92 | 90 | 46 | 110 | 95 | 138 | 182 | 72 | 101 | 80 | 48 | | 100% | |
Priority ratios | 8.1% | 12.5% | 7.5% | 4.0% | 5.9% | 5.8% | 3.0% | 7.1% | 6.1% | 8.9% | 11.7% | 4.6% | 6.5% | 5.1% | 3.1% | | | |
Ratings | 4 | 1 | 5 | 13 | 9 | 10 | 15 | 6 | 8 | 3 | 2 | 12 | 7 | 11 | 14 | | | |
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