Verified by the CalcTree engineering team on July 8, 2024
This calculator designs timber members in compression, like columns and truss struts, by ensuring the member meets compression requirements to Ultimate Limit State (ULS) methods.
All calculations are performed in accordance with AS 1720.1-2010.
Check out our Timber Design Standards - AS1720 and AS1684 for further explanation about timber design for compression members.
Results Summary
Summary_input
:150mm x 100mm F22 Seasoned Softwood timber columnSummary_output
Design Check | Action | Resistance | Utilisation | Status |
Flexural | N* = 150.0 kN | Md = 190.8 kN | 0.79 | 🟢 |
Calculation
Assumptions
Material Properties
Stress grade
:F22
f'c
:42Stress Grade
Type
:Softwood
pc
:1.12Types
Seasoned or unseasoned
:Seasoned
Column Geometry
Condition of end restraint
:Restrained at both ends in position only
D
:{"mathjs":"Unit","value":150,"unit":"mm","fixPrefix":false}
B
:{"mathjs":"Unit","value":100,"unit":"mm","fixPrefix":false}
Ag
:15000
L
:{"mathjs":"Unit","value":2000,"unit":"mm","fixPrefix":false}
Lax
:{"mathjs":"Unit","value":2000,"unit":"mm","fixPrefix":false}
Lay
:{"mathjs":"Unit","value":2000,"unit":"mm","fixPrefix":false}
Loads
Type of live load
:Floors - Residential and Domestic
G
:{"mathjs":"Unit","value":50,"unit":"kN","fixPrefix":false}
Q
:{"mathjs":"Unit","value":60,"unit":"kN","fixPrefix":false}
W
:{"mathjs":"Unit","value":5,"unit":"kN","fixPrefix":false}
Ψs
:0.7
Ψl
:0.4
Ψc
:0.4
Modification Factors
k1
:0.8Load duration factor, k1
k4
:1Moisture content factor, k4
k6
:1Temperature Factor, k6
k12_yy
:0.7533333333333352
k12_xx
:0.40Stability Factor, k12
ULS Compression Check
ϕ
:0.95Capacity reduction factor
Nd,c
:190.848214285714
N*
:150
Utilisation
:0.785964912280703
Design status
:PASS
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