Official Journal of the Japan Wood Research Society
Table 2 Assessing indicators and grading criteria for compression-bending components
From: Quantitative safety evaluation of ancient Chinese timber arch lounge bridges
Factor | c1 | c2 | c3 | c4 | c5 | c6 | c7 | c8 | c9 |
|---|---|---|---|---|---|---|---|---|---|
Assessing indicator | \(\rho\) | \(k\) | \(\frac{t}{b}\) | \(50\frac{w}{l}\) | \(30\frac{\delta }{l}\) | \(1.1 - \frac{R}{{\gamma_{0} S}}\) | \(\frac{\lambda }{200} - 0.1\) | 1 − \(\rho_{{\text{c}}}\) | \(\rho_{{\text{d}}}\) |
Grade 1 | 0–0.05 | 0–0.05 | 0–0.05 | 0–0.11 | 0–0.11 | 0–0.1 | 0–0.6 | 0–0.05 | 0–0.05 |
Grade 2 | 0.05–0.10 | 0.05–0.10 | 0.05–0.10 | 0.11–0.17 | 0.11–0.17 | 0.1–0.15 | 0.6–0.65 | 0.05–0.30 | 0.05–0.10 |
Grade 3 | 0.10–0.20 | 0.10–0.15 | 0.10–0.20 | 0.17–0.33 | 0.17–0.33 | 0.15–0.20 | 0.65–0.75 | 0.30–0.40 | 0.10–0.17 |
Grade 4 | 0.20–0.25 | 0.15–0.20 | 0.20–0.25 | 0.33–0.45 | 0.33–0.45 | 0.20–0.25 | 0.75–0.90 | 0.40–0.50 | 0.17–0.30 |
Grade 5 | > 0.25 | > 0.20 | > 0.25 | > 0.45 | > 0.45 | > 0.25 | > 0.90 | > 0.50 | > 0.30 |