The coil rests on two lower beams of 20 x 20 cm cross-section and a length t = 320 cm. The loaded length from each beam on top is r = 210 cm. With the extension of (t - r) = 110 cm and the load of 8.5 t the necessary section modulus for each beam of about 1150 cm³ is obtained from the diagram in Figure 16. The same situation applies to the upper beams loaded directly by the coil with r = 100 cm.
The beams have a section modulus of 1217 cm³ (Table 1). Also the extension of 110 cm is well within permissible limits.
| dimensions in cm |
10 x 10 |
12 x 12 |
15 x 15 |
20 x 20 |
| section modulus in cm³ |
152 |
263 |
513 |
1217 |
Table 1: Section modules of timber beams (with 3 % shrinkage)
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