Section C4 – Geotechnical Considerations

The Seismic Assessment of Existing Buildings (the Guidelines) provides a technical basis for engineers to carry out seismic assessments of existing buildings within New Zealand.

Part C of the Guidelines describes the Detailed Seismic Assessment (DSA) process used to assess the seismic behaviour of a building. This is a more comprehensive assessment than the Initial Seismic Assessment process described in Part B. The DSA assesses the structural load paths within the building, the capacity of each structural element, the likely inelastic mechanisms, the global building response to earthquake shaking and the impact of secondary structural and critical non-structural building elements.

The DSA process is based on the Part A principles, which are an integral part of the seismic assessment process. Sections C1, C2, C3 and C4 provide an overview of the DSA process, the assessment procedures and analysis techniques, the earthquake demands and geotechnical considerations. Sections C5 to C9 provide recommendations for specific materials and Section C10 provides recommendations for secondary structural and non-structural elements. Each of these build on the common aspects within Sections C1 to C4 and Part A.

Summary and Download

Section C4 (download) provides guidance for considering geotechnical behaviour and its impact on the seismic behaviour and seismic rating of existing buildings. This section includes guidance on the recommended interactions between structural engineers and geotechnical engineers and their particular roles and responsibilities. It also explains the identification and assessment of geohazards, selection of geotechnical parameters, and the consideration of soil- structure interaction (SSI) and foundation systems.

Contact

This web site has a searchable Knowledge Base with answers to questions about the Guidelines. Use article links in the Knowledge Base section to the right to view these.

If you have a question about Section C4, please check the Knowledge Base articles for Part C. If it is not addressed there, please refer to Writing Questions so your question can be efficiently addressed when you send it using the form below. Use the article links in the Knowledge Base section to the right for questions on Part A or Part B.

Version Control

Download Link Version Size Issued
Initial release (Current) 1 2 MB July 2017
Consultation Draft 2016_C 2 MB 10 October 2016
Sector Briefing Draft 2016_SB 3 MB 30 June 2016