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Assessment of Existing Precast Concrete Floors (Wellington)
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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.

 Export to Your Calendar 28/11/2018
When: Tuesday 20 November 2018
12:30 pm
Where: James Cook Hotel Grand Chancellor
147 The Terrace
Wellington 6011
New Zealand
Contact: Learned Society - Secretary
(09) 536 5410

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Supported by NZSEE and SESOC

WHY YOU & YOUR EMPLOYEES SHOULD ATTEND THIS SEMINAR
Precast concrete floors comprise precast floor units topped with in-situ (often lightly) reinforced concrete topping to form a composite floor system that generally also functions as a diaphragm. Such floors are a common feature of New Zealand buildings, being almost ubiquitous during the 1980s and early 1990s.

Four types of precast floor units are commonly encountered in New Zealand, namely:

  • hollowcore
  • double tee
  • ribs (with timber infill), and
  • flat slabs.

Historic construction practices mean that existing floors of all four types may be more vulnerable to earthquakes than current designs. This is  particularly the case for floors constructed using hollowcore and double tee units as has been illustrated in Christchurch and Wellington following recent earthquakes. Assessment of the capacity of existing precast floors is complex.

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, including illustration of how the guidelines account for behaviours observed in past earthquakes and laboratory testing. Use of the guidelines will be illustrated by presentation of worked examples for key flooring types.The

THIS SEMINAR WILL COVER

  • Overview of behaviour of precast concrete floors
    • Hollowcore
    • Double tee
    • Rib and infill
    • Flat slab
  • Historic construction practices for precast concrete floors
  • Summary of research investigating behaviour of precast concrete floors
  • Observed earthquake performance of precast concrete floors in Christchurch and Wellington
  • Inspection of precast concrete floors systems
  • Detailed assessment of precast concrete floors
    • Loss of support
    • Hollowcore positive and negative moment failure
    • Failure of ‘pigtail’ loop bar support
    • Interaction with walls and frames
    • Entrapment of rib-infill floors
  • Examples of precast concrete floor assessment
    • Hollowcore
    • Double tee

OTHER BENEFITS

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

WHO SHOULD ATTEND
Designers, Specifiers, Site Engineers, Contractors, Building Certifiers, Local Authorities, Consulting Engineers, Project Managers, Graduate Engineers.

INVESTMENT DETAILS

  • CNZ-LS members $340 (GST exclusive) per person
  • Non CNZ-LS members $440 (GST exclusive) per person (includes complimentary CNZ-LS membership until 30 June 2019)

SEMINAR FEES INCLUDE

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

PROGRAMME

12.30 – 1.00 pm Registration, tea and coffee
1.00 – 2.50 pm Sessions 1 & 2

  • Overview of behaviour of precast concrete floors
    • Hollowcore
    • Double tee
    • Rib and infill
    • Flat slab
  • Historic construction practices for precast concrete floors
  • Summary of research investigating behaviour of precast concrete floors
  • Observed earthquake performance of precast concrete floors in Christchurch and Wellington
  • Inspection of precast concrete floors systems

2.50 – 3.10 pm Afternoon Tea
3.10 – 5.00 pm Sessions 3 & 4

  • Detailed assessment of precast concrete floors
    • Loss of support
    • Hollowcore positive and negative moment failure
    • Failure of ‘pigtail’ loop bar support
    • Interaction with walls and frames
    • Entrapment of rib-infill floors
  • Examples of precast concrete floor assessment
    • Hollowcore
    • Double tee

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

  • Ken Elwood, Courtesy of the University of Auckland
  • Des Bull, Courtesy of Holmes Consulting
  • Chris Poland, Courtesy of Clendon Burns and Park
  • Carl Ashby, Courtesy of WSP-Opus

The financial support provided by MBIE that enabled development of the revised appendix is gratefully acknowledged.

 

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