Structural Engineering

There is no substitute for efficient, effective structural designs. In an industry where the cost/weight ratios and project time frames are a major focus, expert knowledge of engineering and construction techniques are essential. Recognising your needs and delivering the outcome you need on time and within budget are what we are good at.

With an extensive network of clients, suppliers, and contractors nationwide, you are assured of the most up to date techniques and construction trends.

Our latest tool is a 3D Scanner with Radan software which brings another dimension to structural engineering services that KOA offers you.  We have a specialised team of technicians trained with the GSSI and Radan software and constantly kept up to date with new software.

Civil Engineering

KOA provides all of the core engineering services, with our civil engineers being pivotal in our project development process. The civil engineering team is the link between project parameters, giving you the advantage of all your requirements being met within the one practice, calling upon specialists as required.

Seismic Assessments

Seismic Assessments are typically undertaken for buildings that fall within the scope of the earthquake prone provisions of the Building Act, that is, commercial buildings and residential buildings that are of two or more storeys and contain three or more household units.

The process of seismic evaluation of buildings is technical in nature, and should be undertaken by experienced and competent structural engineers.

ISA (Initial Seismic Assessment)

An ISA enables territorial authorities, building owners and managers to review their building stock as part of an overall risk management process.

These can be undertaken with variable levels of available information, eg: exterior only inspection, structural drawings available or not, interior inspection, etc.  The more information available the more representative the ISA results are likely to be.  The ISA records information that has formed the basis of the assessment and consideration of this is important when determining the likely reliability result.

This is the first stage review.  Buildings or specific issues are flagged by the ISA process as being problematic or as potentially critical structural weaknesses, which may need further detailed investigation and evaluation.  A DSA would be recommended if this is the case.

The output of an ISA is expressed as a % (NBS) of New Building Standard or by a grading level

DSA (Detailed Seismic Assessment)  

A Detailed Seismic Assessment typically follows as the next step after an ISA score where more reliability is required.

This report is done to the New Zealand Society of Earthquake Engineering (NZSEE) guidelines.  The legislation sets the “criteria for and “Earthquake Prone” building being, in effect, a building failing to survive a moderate earthquake.  All relevant documentations are reviewed and required to be available.  Calculations and an analysis of the building are undertaken by a qualified Engineer.

This detailed report will give you a NBS % and recommend the required work to be undertaken if necessary.

Soil Testing

Our team of civil engineers and surveyors have a wide knowledge base on soil testing and can get your project underway with testing and reporting showing the complexities of the foundation you will be wanting to build on that will enhance your project.


The scanner through a GSSI unit allows reinforcement locations and depths of simple concrete structures, interactive mapping of conduits or other subsurface features within concrete structures.  It is able to process rebar, areas of deterioration, slab thickness and voids.  The scanner works to a depth of 400mm.  Once information is collecting it is then downloaded to Radan Software which allows viewing options.

Engineers use the ground penetrating radar to safely locate structures within existing concrete prior to drilling, cutting or coring.  Engineers are interested in detecting the presence of voids that can impact the structural stability of concrete slabs.  This allows taking advantage of locating targets in real time.  Being able to access these locations prior to work avoids costly or dangerous hits.

Engineering services:

  • Structural Design
  • Concrete & Timber Structures 
  • Structural Seismic Design & Assessments 
  • Insurance Reinstatement Work
  • Educational Facilities 
  • Structural Inspections & Remedial Designs 
  • Bridges & Waterway Structures 
  • Roading & Highway Geometric Design 
  • Stormwater & Sewer Services 
  • Civil Siteworks
  • Fire Reports
  • Randan Scanning 

Copyright Kevin O’Connor & Associates Ltd 2018