Timber · Beams & joists
Timber bearing perpendicular to grain calculator
Bearing capacity with the bearing-length factor k7.
Standard: AS 1720.1 Cl 3.2.6
Inputs in the worked example
The live calculator starts with these values; change any of them and every result, check and diagram updates instantly.
| Input | Value | Unit |
|---|---|---|
| Member breadth | 45 | mm |
| Bearing length | 90 | mm |
| Characteristic bearing f′p | 10 | MPa |
| Bearing length factor k7 | 1.15 | |
| Capacity factor φ | 0.85 cat 2 | |
| Duration k1 | 0.8 (5 months) | |
| Moisture k4 | 1 | |
| Temperature k6 | 1 | |
| Reaction N* | 18 | kN |
Worked example — results
| Result | Value | Unit |
|---|---|---|
| Bearing area | 4,050 | mm² |
| φNp = φ k1 k4 k6 k7 f′p Ab | 31.67 | kN |
- ✓ N* ≤ φNp
Method, formulas and assumptions
- Bearing area = 45*90 = 4050 mm²
- φNp = φ k1 k4 k6 k7 f′p Ab = 0.85*0.8*1*1*1.15*10*4050/1000 = 31.671 kN
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For preliminary design and education. Check every result against the current standard and your own engineering judgement before use.