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Assessment of Existing Concrete Buildings Using the Revised C5 Guidelines (Auckland)
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A revision and substantial expansion of the appendix to Section C5 of the Technical Guidelines for Engineering Assessment that covers precast concrete floors has recently been completed. This updates and simplifies the procedures for assessment of hollowcore floors previously published in the University of Canterbury ‘purple book’, and extends these procedures to cover other types of precast concrete floors. This seminar will present a thorough overview of the updated assessment guidelines.

When: Thursday 18 July 2019
10:00 am
Where: Ellerslie Event Centre
80-100 Ascot Avenue (Ellerslie Racecourse)
Auckland 1051
New Zealand
Contact: Learned Society - Secretary
(09) 536 5410

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***** Download Registration Form *****

The “technical proposal” to revise Part C5 of the Engineering Assessment Guidelines was released during late 2018 for use during ‘non-earthquake-prone’ assessments of concrete buildings. This update was the result of more than 12 months of effort to introduce state-of-the-art knowledge to Part C5 based on international guidance and ongoing local research.

The revised guidance provides a simpler and more comprehensive means of assessing existing concrete buildings, which are prevalent amongst New Zealand’s building stock. The revised guidelines provide for assessment of elements and behaviour types not previously covered by Part C5, as well as improving the realism of provisions for assessing shear and deformation capacity. The revised guidance also incorporates a simplified method for assessing some diaphragms.

This seminar will present a thorough overview of the updated assessment guidelines, describe the background to key provisions of the revised guidance, and illustrate use of these provisions by application to example scenarios. Particular emphasis will be placed on illustrating how the guidelines account for behaviours observed in past earthquakes and laboratory testing.


  • Overall assessment philosophy
  • Material properties and detailing
  • Approaches to determining deformation capacity
  • Deformation capacity of columns, including member geometric effects
  • Column shear strength
  • Deformation capacity of walls, including lateral buckling
  • Loss of gravity support for columns, slab-column connections, and walls
  • Elements containing plain round reinforcement
  • Elements where deformation concentrates at a single crack
  • Assessing diaphragms containing mesh reinforcement


  • Valuable resource through the seminar notes
  • Knowledgeable experienced speakers with good presentation skills
  • The opportunity to network with industry peers

Designers, Local Authorities, Consulting Engineers, Project Managers, Graduate Engineers.


  • CNZ-LS members $450 (GST exclusive) per person
  • Non CNZ-LS members $550 (GST exclusive) per person (includes complimentary CNZ-LS membership until 30 June 2020)


  • Tea and coffee on arrival
  • Lunch
  • Afternoon tea
  • Comprehensive seminar notes


10:00 – 10:30 Registration, tea and coffee

10:30 – 12:00 Sessions 1 & 2

Session 1
  • Introduction and Overall philosophy
  • Material properties and element stiffness
  • Deficient splices and anchorages, including mechanical, welded, and grouted bar connections
Session 2
  • Approaches to determining deformation capacity
    • Moment-curvature method
    • Direct rotation method
    • Geometric effects
    • Loss of axial capacity

12.00 – 12:45 pm Lunch

12.45 – 2.45 pm Sessions 3 & 4

Session 3 – Columns
  • Deformation capacity, including detachment
  • Column shear strength
  • Mechanisms of axial failure and ‘SSW’ columns
Session 4 – Walls
  • Deformation capacity, including lateral buckling
  • Axial failure of lightly reinforced walls

2.45 – 3.15 pm Afternoon Tea

3.15 – 5.00 pm Sessions 5 & 6

Session 5 – Beams, round bars, & single crack scenarios
  • Behaviour of elements reinforced with plain round bars
  • Conditions that cause deformations to concentrate at a single crack
  • Behaviour when deformations concentrate at a single crack
Session 6
  • Beam-column joints
  • Slab-column connections
  • ‘Deemed to comply’ approach for robust diaphragms

Concrete NZ – Learned Society acknowledges the following supporting organisations for making this seminar series possible:

  • Ken Elwood, Courtesy of the University of Auckland
  • Nicholas Brooke, Courtesy of Compusoft Engineering

***** Download Registration Form *****