Oz-Post Website

Engineering Specifications

STRENGTH TESTINg

FACET Consulting Engineers of Brisbane arranged the strength testing for Oz-Post to determine the bending strength.  

The Structures and Geometrics Testing Laboratory of The Department of Civil Engineering at The University of Queensland; a NATA accredited testing facility administered testing equipment, instrumentation and testing personnel.

The primary purpose of the testing was to establish the lateral bending strength of a variety of Oz-Posts in light to medium sandy and silty clay soil conditions. 

Receiving test data at the bottom end of the range of expected bending strength, presented a lower bound expectation and replicated the behaviour of the Oz-Post under the effect of wind loading and other horizontal loadings.

Dynamic Cone Penetrometer testing was undertaken at a representative number of points at each test site to provide for correlation between soil strength parameters and Oz-Post bending strength test results.

Further information specific to these tests is available on request. 

A 5kN calibrated load cell was used to apply a horizontal load against a reaction frame. Loading was applied at approximately 1kN/minute to failure. 

From the test data obtained, suitable posts for particular applications could be established by calculation to suit particular Oz-Post supports in these soil strength conditions.

SITE 1 – SAND FILL

OZ-POST 

MOMENT Min. 

MOMENT Max. 

(KnM)
Ave. 

SDev 

COV(%) 

SW600

2.69

3.26

3.02

0.23

7.47

10

SW750

2.82

4.00

3.47

0.37

10.60

10

SITE 2 – SANDY SILTY CLAY

OZ-POSTMOMENT Min. MOMEN Max.(KnM)
Ave.
SDevCOV(%)n
S6002.794.013.330.3711.0010
SW6003.594.063.840.184.7510

Special SW600  

3.824.874.280.358.1310
OBSERVATIONS
  1. For the Oz-posts tested in sand, failure was by overturning due to soil failure.
    Thus in better soil, the Oz-post strength would be expected to increase.
  2. For the S600 and SW600 Oz-posts tested in silty clay, failure was by compression blade buckling.
    In better soils the Oz-post strength would not be expected to increase significantly.
  3. Similar products were tested under the same conditions and failed to meet Oz-Post standards.