The Canterbury territorial authorities have adopted an approach to identify earthquake-prone buildings and are requiring some building owners to carry out a DEE to establish the seismic strength their buildings.
Other commercial organisations and government agencies have adopted policies to only occupy buildings that achieve a specified earthquake strength.
A Detailed Engineering Evaluation is a process to identify the seismic strength of a building and compare it to the current building standards. This is then reported as a percentage of New Building Standard (%NBS)
As a means of attracting quality tenants and maintaining relationships with existing tenants, the owners of a prominent Christchurch retail shopping complex wished to strengthen their buildings to 100 %NBS.
The owners had determined that the long term economic benefits of providing tenants with a high standard building justified the costs associated with strengthening their buildings.
Eliot Sinclair were engaged to carried out DEE assessments to identify the seismic strengths of each building and design strengthening to upgrade to the owner’s desired target of 100%NBS.
The changes in the earthquake loadings standards meant that even a new building constructed prior to the Canterbury earthquake sequence would no longer achieve a 100 %NBS rating. The result was that each building in the complex required strengthening to achieve the owner’s target strength.