NZ Faade Design Current NZ Paradigm (Synopsis and Critique) Building - - PowerPoint PPT Presentation

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NZ Faade Design Current NZ Paradigm (Synopsis and Critique) Building - - PowerPoint PPT Presentation

Nov 15, 2022 766 likes •1.19k views

NZ Faade Design Current NZ Paradigm (Synopsis and Critique) Building Enclosure Council Forum June 2017 Introduction Karl Jones BAS, BE(hons), CPEng, MIPENZ 05/07/2017 Mott MacDonald | Presentation 3 Project Examples 6 Agenda 1.

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SLIDE 1

Building Enclosure Council Forum – June 2017

Current NZ Paradigm (Synopsis and Critique)

NZ Façade Design

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SLIDE 2

Introduction

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SLIDE 3 05/07/2017 Mott MacDonald | Presentation 3

Karl Jones

BAS, BE(hons), CPEng, MIPENZ

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SLIDE 4
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SLIDE 5

Project Examples

6
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SLIDE 6 Mott MacDonald | Presentation Claddings Intitute 7

1. Current Paradigm (Design/Compliance) 2. Façade Consultant Role 3. Assessing/Minimising Risk 4. Conclusion

Agenda

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SLIDE 7

Current Paradigm

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SLIDE 8 05/07/2017 Mott MacDonald | NZIA Technical Series 9 Building Act Building Code Compliance Documents Alternative Solutions Acceptable Solutions Verification Methods Codemark Certification?? Other Standards Other Testing Opinion

Lawct

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SLIDE 9 05/07/2017 Mott MacDonald | NZIA Technical Series 10

Objectives Functional Requirements Performance

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SLIDE 10 05/07/2017 Mott MacDonald | NZIA Technical Series 11

E2- AS1

Misappropriation

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SLIDE 11 05/07/2017 Mott MacDonald | Presentation title 12

E2/AS1 is not “the Building Code”

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SLIDE 12 05/07/2017 Mott MacDonald | NZIA Technical Series 14

Master Builder

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SLIDE 13 05/07/2017 Mott MacDonald | NZIA Technical Series 15

Architect Mason

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SLIDE 14 05/07/2017 Mott MacDonald | NZIA Technical Series 16

Architect

Builder

Engineer

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SLIDE 15 05/07/2017 Mott MacDonald | NZIA Technical Series 17

Architect

Main Contractor

Engineer

Sub Contractors

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SLIDE 16 05/07/2017 Mott MacDonald | NZIA Technical Series 18

Architect

Main Contractor

Structural Engineer

Sub Contractors

Mechanical Engineer

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SLIDE 17 05/07/2017 Mott MacDonald | NZIA Technical Series 19

Architect

Main Contractor

Façade Engineer

Sub Contractors

Mechanical Engineer

Structural Engineer

Project Manager Quantity Surveyor

Acoustic Engineer Fire Engineer Landscape Architect

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SLIDE 18

Façade Consultant Role

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SLIDE 19 Mott MacDonald | Presentation Claddings Intitute 27

WHAT IS A FAÇADE ENGINEER?

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SLIDE 20

CONSULT

LATIN: CONSULTARE – to deliberate, to question

Mott MacDonald | Presentation Claddings Intitute 34
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SLIDE 21 Mott MacDonald | Presentation Claddings Intitute 44

Design

Design Process

Sequential – Naïve – Simplistic

Compliance Procurement

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SLIDE 22 Mott MacDonald | Presentation Claddings Intitute 45

Design Process

Holistic – Integrated – Pragmatic

Design Procurement Compliance

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SLIDE 23

Minimising Risk

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SLIDE 24

NZ Building Code Compliance

48
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SLIDE 25

A Risk Awareness Tool for Multi-Storey Buildings??

Limitations? 10/15/20/25 Storeys

49

Simple Non Technical Informative Not Compliance Critical Parameters?

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SLIDE 26
  • 1.5-2.5kPa

Wind Pressures

  • >2.5kPa
  • <1.5kPa

Ultimate Limit State (Corner Pressures) 3s Gust 1/500 return

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SLIDE 27
  • Complex Plan – most similar
  • Some recesses
  • Balcony over habitable spaces

Geometric Complexity

  • Non vertical
  • Many recesses
  • Varying floor plans
  • Simple Rectangular
  • <2 recesses

Complexity in the base design

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SLIDE 28
  • e.g. Stick curtainwall

Types of systems

  • e.g. Site installed rain-screen over

fibre cement

  • e.g. Fully unitised curtainwall

Key Words: Track record, engineered, redundancy, rational, responsibilities

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SLIDE 29

Types of systems

  • Prefabricated Systems
  • Engineering Responsibilities easily defined and design completed to local standards
  • Building movements accommodated by mechanisms that are comprehended by

simple rational analysis

  • No exposed sealants, no flashing tapes or foam tapes, limited use of site applied

sealant

  • Overall responsibility for design, fabrication and installation by a

contractor/subcontractor experienced with system

  • More than 10 years in service history

Types of systems – Low Risk

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SLIDE 30

Types of systems

  • Some on site, some off site fibrication
  • Engineering requires coordination by multiple parties
  • Design or certification to less familiar standards not cited in AS/NZS
  • Building movements accommodated by mechanisms that are comprehended by

more complicated rational analysis

  • Some exposed sealants in protected locations, no flashing tapes or foam tapes, site

applied sealant to very stable substrates

  • Overall responsibility for design, fabrication and installation by no more than 2

contractor/subcontractors experienced with system

  • 5-10 years in service history

Types of systems – Medium Risk

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SLIDE 31

Types of systems

  • Systems with mainly site fabrication
  • Design and/or testing to less unfamiliar standards (not codified methods)
  • Building movements accommodated by mechanisms that are comprehended by

complicated rational analysis, or unable to be rationally assessed

  • Exposed sealants in protected locations, flashing tapes or foam tapes
  • Overall responsibility for design, fabrication and installation by more than 2

contractor/subcontractors experienced with system

  • Less than 5 years in service history

Types of systems – High Risk

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SLIDE 32
  • 3-4

Number of Systems

  • >5
  • 1-2

More systems = more interfaces Multiple Subcontractors (Coordination)

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SLIDE 33

Six Risk Parameters

7

subcontractors

9

systems

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SLIDE 34

3

systems

Six Risk Parameters

6 2

subcontractors

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SLIDE 35
  • Limited company experience
  • Some staff have personal relevant experience

Subcontractor Experience

  • No experience on similar building
  • >10 years
  • Successfully delivered many similar

Time & Relevance

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SLIDE 36
  • Seismic Drift 6-14mm
  • Vertical Differential 10-14mm

Building Movements

  • Seismic Drift 15-40mm
  • Vertical Differential 15-35mm
  • Seismic Drift <6mm
  • Vertical Differential <10mm

Seismic/Earthquake & Vertical Serviceability

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SLIDE 37
  • Systems tested but not together
  • Project specific interfaces untested

Performance Testing

  • No testing
  • All systems tested 1 Specimen

AS/NZS4284 (Sirowet) Often non project specific (Historical) Include Seismic

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SLIDE 38

Facade System Type

Six Risk Parameters

Wind Pressure Façade Complexity Number of Systems Experience Building Movements Performance Testing

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SLIDE 39

Conclusion

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SLIDE 40 05/07/2017 Mott MacDonald | Presentation 68
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SLIDE 41

Thank you