Seismic Assessment and Strengthening

Christchurch

The Challenge

The owners of a warehouse and office complex in Christchurch needed to understand how their building would perform in an earthquake. In Christchurch especially, this is not an abstract concern. Getting an honest, thorough assessment is the first step, but the real test of an engineering relationship is what happens next, when the design for any strengthening work is required. The client was happy with our assessment and communication and engaged us for the strengthening scheme.

The EAP Solution

We carried out a detailed seismic assessment of the warehouse and office buildings, working through council records, completing a site survey, and producing a full DSA report in the standard SESOC format. The assessment gave the client a clear picture of where the buildings stood and what needed to be done. The client had enough confidence in our work to engage us directly for the strengthening design, without going back to the market. We redesigned the critical connection details to make them bolted rather than welded, replacing strapping with walers and simplifying the roof bracing connections throughout. The result was a more buildable, more resilient structure. We managed the building consent lodgment and provided construction monitoring through to completion.

Key Engineering Elements

  • Detailed seismic assessment (DSA)
  • Council record search and site survey
  • Strengthening design for warehouse and office buildings
  • Redesign of fly braces to bolted connections
  • Replacement of strapping with waler beams
  • Removal of welded plates from roof bracing connections
  • Bolted end connections to the existing waler beam
  • Building consent preparation, lodgement, and RFI management