Timber Beam Bearing Capacity Calculator
Design bearing capacity perpendicular to grain in accordance with AS 1720.1.
AS 1720.1 • Clause 3.2.6.1 • Clause 2.4 • Appendix H
1. Timber & Bearing Property
AS 1720.1 Appendix H — Table H2.2.
Strength group is selected from the applicable species classification.
MGP bearing properties are based on SD6 or better;
A17 on SD4 or better.
Bearing perpendicular to grain.
Selected SD4 → f′p = 17 MPa.
2. Structural Application Category & Capacity Factor φ
Select the Structural Application Category applicable to the
consequence of failure and structural function of the member.
Confirm the project-specific category from AS 1720.1.
3. Bearing Geometry
Measured parallel to grain.
4. Duration of Load Factor k₁
5. Moisture / Seasoning Factor k₄
6. Temperature Factor k₆
7. Bearing Length & Position Factor k₇
End bearing → k₇ = 1.00.
8. Design Bearing Action
Enter the strength-limit-state reaction at the bearing being checked.
Normally use 1 when checking one support location.
Nd,p =
φ × k₁ × k₄ × k₆ × k₇ ×
f′p × Ap
Bearing perpendicular to grain
Design Results
Bearing Area Aₚ
—
Design Bearing Stress
—
Design Capacity Nd,p
—
Utilisation
—
Enter the design information and calculate.
Calculation Breakdown
—
| Parameter | Value | Description |
|---|---|---|
| φ | — | Capacity factor |
| k₁ | — | Duration of load |
| k₄ | — | Moisture / seasoning |
| k₆ | — | Temperature |
| k₇ | — | Bearing length and position |
| f′p | — | Characteristic bearing strength |