Timber Beam Calculator to AS1720.1

Verified by the CalcTree engineering team on July 14, 2024
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This calculator designs timber members in bending, like rafters and joists, by ensuring the beam meets flexural and shear 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 flexural members.
CalculationAssumptions
Material Properties
﻿﻿Stress grade
:F27​
﻿
﻿﻿f'b
:67​
﻿
﻿﻿f's
:5.1​
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Stress Grade
﻿﻿Type
:Softwood​
﻿
﻿﻿pb
:1.08​
﻿
Types
﻿﻿Seasoned or unseasoned
:Seasoned​
﻿
﻿
Beam Geometry
Loads
Modification Factors
ULS Flexural Checks
﻿﻿ϕ
:0.95​
﻿
Capacity reduction factor
﻿﻿M*
:4.95​
﻿
﻿﻿Md
:5.82946049099624​
﻿
﻿﻿Utilisation_b
:0.8491351828604738​
﻿
﻿﻿Design status_b
:PASS​
﻿
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Md=ϕk1 k4 k6 k9 k12 fb′ Z×ncomM_d = \phi k_1 \space k_4 \space k_6 \space k_9 \space k_{12} \space f'_b \space Z \times n_{com}Md​=ϕk1​ k4​ k6​ k9​ k12​ fb′​ Z×ncom​
﻿﻿V*
:9.9​
﻿
﻿﻿Vd
:11.8329347279924​
﻿
﻿﻿Utilisation_s
:0.8366479007595823​
﻿
﻿﻿Design status_s
:PASS​
﻿
﻿
Vd=ϕk1 k4 k6 fs′ AsV_d = \phi k_1 \space k_4 \space k_6  \space f'_s \space A_s Vd​=ϕk1​ k4​ k6​ fs′​ As​
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Related ResourcesTimber Design Standards - AS1720 and AS1684
Timber Column Calculator to AS 1720.1
Timber Beam Calculator to EC5