The New Zealand Steel Structures Standard states that high strength structural bolts shall be supplied to AS/NZS 1252. This standard was republished on 23rd December 2016 after undergoing a major revision. The main technical changes incorporated in the new edition relate to updated testing and conformity requirements, the inclusion of the nominated European standard EN 14399-3 property class 8.8 HR bolt as a “Deemed to satisfy” alternative and an additional European EN 14399-3 high tensile property class 10.9 HR.
A significant change to AS/NZS 1252 has been the creation of Part 2, “Verification testing for bolt assemblies”. This represents a restricted form of third-party conformity assessment to provide confidence in products manufactured to AS/NZS 1252.1. Implementation of the AS/NZS 1252.2 verification test requirements has been problematic due a lack of test equipment in Australasia to undertake all the prescribed test procedures, and concern that the test requirements are excessive for routine batch testing of product from regular suppliers. Consequently, the requirements of AS/NZS 1252.2:2016 have not been fully implemented, either in New Zealand or Australia.
Practice Note on the Sourcing of Compliant High Strength Structural Bolts
The New Zealand Steel Structures Standard states that high strength structural bolts shall be supplied to AS/NZS 1252. This standard was republished on 23rd December 2016 after undergoing a major revision. The main technical changes incorpo...
MAT1010 Rev 1.pdf
|Materials||23/11/2020||Kevin Cowie, Stephen Hicks, Raed El Sarraf|
Practice Note on the Sourcing of Threaded Rod Used for Foundation Bolts
Threaded bars are commonly used in the structural engineering industry. It is used as replacement for long bolts as well as for concrete anchors and foundation bolts. This product is not covered under New Zealand Standard AS/NZS 1252...
|Materials||20/02/2018||Kevin Cowie, Alistair Fussell|
Specifying Impact Toughness of Steel Plates for End Plate Connections in Seismic Lateral Resisting Frames
Structures designed to the Steel Structures Standard, NZS 3404, are required to be able to resist collapse under a maximum considered earthquake as directed by the Loadings Standard, NZS 1170.5. Brittle systems are not permitted. The nature...
|Materials||27/02/2015||Kevin Cowie; Alistair Fussell|
Specifying Steel for Seismic Lateral Resisting Frames
There are three common seismic frame types used in New Zealand. These are the eccentrically braced frame (EBF), concentrically braced frame (CBF) and moment resisting frame (MRF). See figure 1. All steel seismic-resisting systems are req...
|Materials||27/02/2014||Kevin Cowie; Alistair Fussell|
Steel Plate Availability in New Zealand
Bridge construction is a demanding application typically requiring plate welded sections. Material optimisation for welded plate sections involves a careful matching of strength requirements with available plate sizes to minimise waste and ...
Properties and Assessment of Historical Structural Steelwork
The refurbishment or â€˜adaptive re-useâ€™ of existing buildings currently forms a significant part of the workload for many architects and engineers. The structural engineer will be required to make an app...
Performance of the Mercer Off-Ramp Weathering Steel
This article provides an update on the corrosion performance of the State Highway 1 Mercer weathering steel off-ramp, following an inspection by Japanese expert Dr. Makoto Ohya, two and half years after construction.
|Materials||05/02/2009||Raed El Sarraf; Clark Hyland|
New Performance Requirements for Seismic Steel
Amendment 2 of the Steel Structures Standard NZS 3404:1997 released in October 2007 (SNZ, 2007) sets new requirements for steel materials and welding of seismic resisting steelwork that is required to sustain significant plastic deformation...
Non-Standard Plate and Large Hot Rolled Beam Availability
Bridge construction is a demanding application requiring heavy hot rolled and plate welded sections. These types of sections often fall outside the range of standard sections and plates held by local steel distributors. To aid bridge design...
Design Yield Stress vs Mill Certificate Yield Stress
Occasionally the question is asked as to whether a steel that has been certified to a lower steel supply grade classification eg. G250 can be accepted as complying with a higher grade such as G300 on the basis that the Mill Test Certificate...
Steel Availability in New Zealand
There are three main purchase options for structural steel sections and plates in the New Zealand market depending on the project scale. The first and second ex - stock supply options are normally more costly than the third indent supply op...