Timber, a truly sustainable resource, can be used to replace steel and concrete structures in multi-storey building. - PowerPoint PPT Presentation

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Timber, a truly sustainable resource, can be used to replace steel and concrete structures in multi-storey building.

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Timber, a truly sustainable resource, can be used to replace steel and concrete structures in multi-storey building. John Chapman, Senior Lecturer – PowerPoint PPT presentation

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Title: Timber, a truly sustainable resource, can be used to replace steel and concrete structures in multi-storey building.


1
Timber, a truly sustainable resource, can be used
to replace steel and concrete structures in
multi-storey building.
  • John Chapman, Senior Lecturer
  • School of Architecture, University of Auckland

2
Introduction to recent timber building research -
School of Architecture, University of Auckland
  • pinus radiata timber poles as the main structural
    elements in commercial / industrial building
  • research is in response to the advantages of
    timber as a sustainable material
  • 4 separate, but interrelated, studies

3
Environmental Reasons for radiata poles as
structural elements in building
  • radiata poles are
  • a renewable resource
  • require little energy during manufacture
  • absorb carbon from the atmosphere and reduce
    greenhouse gases

4
Other Reasons for radiata poles as building
structural elements
  • Competent
  • structural product
  • higher failure stresses than sawn lumber
  • cheap timber at NZ350/cu.m
  • Images by Andrew Charleson senior lecturer
    Victoria University

5
Study 1 Radiata Poles as the Columns in
Multi-storey Timber Building
6
Study 2 Investigating Timber Floor Types for
Commercial Building
  • floor structure types
  • glulam
  • timber trusses
  • LVL (linear veneer lumber)
  • office live loading of 3 Kpa
  • resulting timber floors compared for cost and
    volumes of timber.

7
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8
Study 3 Large Industrial Truss Structures Using
Pinus Radiata Poles
9
Study 4 Six Storey Apartment Building using
Radiata Poles for the Beam and Column Structural
Elements
  • results of studies 1 to3 led to the proposal that
    timber poles were very suited for the structural
    elements in medium storey apartment building

10
Apartment Plans
  • beams and posts can be arranged as simple posts
    and beams
  • resistance to horizontal loads supplied by the
    frequent party walls
  • floor is timber
  • floor beams are pairs of radiata poles

11
Apartments Cross Section
  • The research considered seven aspects of the
    prototype pole building
  • dimensional stability of the timber
  • environmental impact
  • building strength
  • non destructive testing of poles
  • economics
  • fire resistance
  • sound insulation

12
Environmental Impact
  • Pole building structure
  • Energy for manufacture
  • 0.5 Gj/sq.m.
  • Total carbon absorbed from atmosphere
  • 27.4 Kg/sq.m.
  • Equivalent RC structure
  • Energy for manufacture
  • 2.24 Gj/sq.m.
  • Total carbon emitted into atmosphere
  • 52.5 Kg/sq.m.

13
Building Strength
  • pole members readily available
  • for major earthquake zones, column pole diameters
    increase by 50mm approx

14
Non Destructive Testing of Timber Poles
  • Acousto-ultrasonic based methods relate
    propagation velocity of the longitudinal wave
    with wood density and modulus of elasticity
  • Acousto-ultrasonic testing detects pole defects.

15
Economics
  • pole/timber structure is 89 the cost of the
    equivalent reinforced concrete structure
  • Pole building structure US124.40 / sq.m.
  • Equivalent R.C. US208.70 / sq.m.
  • timber buildings are significantly lighter than
    the R.C. alternatives and have reductions in
    foundation costs. (not considered in above cost
    analysis)

16
Fire Resistance
  • each residential unit is an independent fire cell
  • pole structure party walls are plasterboard
    lined
  • 80mm expected loss of pole diameter in 1 hour
    fire
  • Poles will continue to support building after 1
    hour fire

17
Sound Insulation
  • 50mm thick concrete floor toppings to protect
    from vertical noise transference
  • Horizontal insulation at party walls assisted by
    fibreglass blanket between two separated timber
    frames
  • Sound transference the main obstacle to timber
    building. Research occurring at the University of
    Auckland Acoustics Research Centre and elsewhere
    in world

18
Conclusions to Radiata Poles as the Columns in
Multi-storey Timber Building
  • no impediments to radiata poles as main
    structural members in multi-storey of up to at
    least 6 storeys
  • 6 storey apartment building most complete project
  • considered more deeply the issues and perceived
    problems
  • Further research into this low energy,
    sustainable, and atmosphere assisting building
    product is continuing

19
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