SkyCiv Documentation

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4. AS 1720 Code Verification

# AS 1720 Code Verification

## AS 1720 – 2010 Code Verification using The Timber Design Handbook HB-108 – 2013 by Standards Australia

Information presented on this page is intended to demonstrate the agreement in results between a trusted source and those which have been calculated in the member design module. All examples are taken from The Timber Design Handbook HB-108-2013 published by Standards Australia.

NOTE: Calculations in the Timber Design Handbook HB-108 – 2013 round values to 3 significant figures however, SkyCiv does use this approach. Values in SkyCiv are calculated with maximum accuracy and reported to 3 decimal places which may cause some minor disagreement between values in the following comparisons.

## Design of Tension Members

### Example 3.3 – Tension capacity of a bottom chord in a roof truss

Variable HB-108 SkyCiv Difference (%)
At 5.11 x 103mm2 5.11 x 103mm2 0
Ndtk1 25.4kN 25.397kN -0.0118

## Design of Compression Members

### Example 4.1 – Compression capacity of a bottom chord in a roof truss subject to wind uplift

Variable HB-108 SkyCiv Difference (%)
r
1 1 0
ρc 0.86 0.864 0.465
S3 14.7 14.74 0.272
S4 80 80 0
k12 0.042 0.042 0
Ndc 3.54kN 3.505kN -0.989

Remarks: In this example, r has been set to 1 for the purpose of checking the accuracy of the calculated results however, normally SkyCiv assumes a value of 0.25 which is conservative an may reduce the capacity of the member by approximately 15-20% if there is a stress reversal in the member for the governing load combination or if the member is designed to carry mostly temporary loads. Future versions of the software may include the calculation of r.

### Example 4.3 – Compression capacity of stud in frame

Variable HB-108 SkyCiv Difference (%)
r
0.25 0.25 0
ρb 1.08 1.082 0.185
S3 20.1 20.20 0.496
S4 35.1 35.11 0.0285
k1 0.57 0.57 0
k4 1.1 1.11 0
k12 0.139 0.139 0
Ndc 7.05kN 7.023kN -0.383

## Design of Bending Members

### Example 5.6 – Design of a floor beam for strength

Variable HB-108 SkyCiv Difference (%)
r
0.25 0.25 0
ρb 0.84 0.844 0.476
S3 20.1 20.20 0.496
S4 35.1 35.11 0.0285
k12 1.0 1.0 0
Mdzk1 44.4kNm 44.627kNm 0.0511