MBIE updates section C5 of the Seismic Guidelines for Concrete Buildings

MBIE would like to address uncertainty in the sector about the future status of Section C5 of the Engineering Assessment Guidelines for the seismic assessment of concrete buildings.

MBIE is not making any changes to the system for managing Earthquake Prone Buildings (EPB) specified in the EPB legislation, including the Engineering Assessment Guidelines.

However, for the next 18-24 months upon the release of a new version of C5, two versions of Section C5 will be available for use by engineers to perform seismic assessments on existing concrete buildings:                                              

  • The current C5 version released in July 2017 (incorporating errata) will continue to be used to assess buildings identified as potentially Earthquake Prone Buildings (EPB) in accordance with the EPB methodology.
  •  A new version of C5 will be available for non-EPB assessment purposes for up to two years and this new version will provide more comprehensive guidance on how to assess pre-cast concrete floor systems. The new version is expected to be released in late October 2018. 

During the 18-24 month period Engineering New Zealand will work closely with the New Zealand Society for Earthquake Engineering (NZSEE) and the Structural Engineering Society New Zealand (SESOC) to gather evidence on the use of the new version of C5.  

This evidence will then be used to indicate to MBIE whether the EPB methodology profile categories need to be reviewed, or whether the new version of C5 is suitable for use in the EPB system. 

To avoid confusion, the two versions of C5 will be hosted on separate pages on the EQ-Assess website (www.eq-assess.org.nz).

More instructions and guidance on when the two different C5 versions should be used will be provided when the new C5 version is formally released.


Dave Robson - Manager Building Performance and Engineering

Building System Performance