Official Journal of the Japan Wood Research Society
Table 1 Assessing indicators and grading criteria for bending components
From: Quantitative safety evaluation of ancient Chinese timber arch lounge bridges
Factor | b1 | b2 | b3 | b4 | b5 | b6 | ||||
|---|---|---|---|---|---|---|---|---|---|---|
For beam member | For purlin member | Deck member | ||||||||
Assessing indicator | \(\rho\) | \(k\) | \(\frac{t}{b}\) | \(\frac{h}{l}\) > 1/14 | \(\frac{h}{l}\) ≤ 1/14 | \(l\) ≤ 4.5 m | \(l\) > 4.5 m | \(50\frac{w}{l}\) | \(1.1 - \frac{R}{{\gamma_{0} S}}\) | \(\frac{{{\Delta }t}}{T}\) |
\(50\frac{w}{l}\) | \(500\frac{wh}{{l^{2} }}\) | \(25\frac{w}{l}\) | \(30\frac{w}{l}\) | |||||||
Grade 1 | 0–0.03 | 0–0.05 | 0–0.03 | 0–0.11 | 0–0.08 | 0–0.09 | 0–0.06 | 0–0.09 | 0–0.1 | 0–0.05 |
Grade 2 | 0.03–0.07 | 0.05–0.10 | 0.03–0.06 | 0.11–0.17 | 0.08–0.12 | 0.09–0.14 | 0.06–0.12 | 0.09–0.14 | 0.1–0.15 | 0.05–0.125 |
Grade 3 | 0.07–0.125 | 0.10–0.15 | 0.06–0.1 | 0.17–0.33 | 0.12–0.24 | 0.14–0.28 | 0.12–0.24 | 0.14–0.28 | 0.15–0.20 | 0.125–0.25 |
Grade 4 | 0.125–0.15 | 0.15–0.20 | 0.1–0.25 | 0.33–0.45 | 0.24–0.40 | 0.28–0.40 | 0.24–0.40 | 0.28–0.40 | 0.20–0.25 | 0.25–0.50 |
Grade 5 | > 0.15 | > 0.20 | > 0.25 | > 0.45 | > 0.40 | > 0.40 | > 0.40 | > 0.40 | > 0.25 | > 0.50 |