Timber Beam — Shear Capacity Calculator
AS 1720.1 — Flexural shear capacity of rectangular timber members
Vd =
φ × k1 × k4 × k6
× f′s × As
1. Timber Material
Automatically selected from the grade database.
The value may also be entered manually.
Selected f′s =
2.60 MPa
2. Beam Section
As = ⅔ × b × d
3. Structural Application Category & Capacity Factor φ
Category 2 — Moderate consequence of failure
Use where failure of the timber member could have a more significant consequence than an ordinary secondary member.
Typical interpretation:
Primary beams, primary columns or important structural framing
supporting occupied areas.
Selected category:
Category 2
Capacity factor: 0.70
The structural application category affects the capacity factor φ.
Higher consequence of failure generally results in a lower design
capacity factor.
Capacity factor: 0.70
4. Load Duration Factor k₁
5. Moisture Factor k₄
6. Temperature / Environment Factor k₆
7. Applied Design Shear
Enter the ultimate design shear action obtained from the structural
analysis and the applicable AS/NZS 1170 load combination.
8. Shear Area Aₛ
Shear Capacity Results
Gross Section Area bd
8,550 mm²
Shear Area Aₛ
5,700 mm²
Characteristic f′s
2.60 MPa
Capacity Factor φ
0.70
k₁ × k₄ × k₆
1.000
Design Shear Capacity Vd
10.37 kN
Applied Shear V*
10.00 kN
Utilization V* / Vd
96.4%
Capacity Reserve
0.37 kN
PASS — Vd ≥ V*
Calculation:
Important:
The structural application category should be selected based on the
consequence of structural failure and the requirements of AS 1720.1.
The examples shown in this calculator are explanatory guidance only;
the designer remains responsible for selecting the appropriate category.