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
SITE 2 – SANDY SILTY CLAY
- 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.
- 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.
- Similar products were tested under the same conditions and failed to meet Oz-Post standards.