Tobias Smith , GM, Prestressed Timber Ltd - Speaking at Seismics and the City 2015

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Smart and Sustainable Buildings for New ZealandDr. Tobias Smith

General Manager, PreStressed Timber Ltd., Christchurch, New ZealandPreStressed Timber Limited info@prestressedtimberltd.co.nzThe Christchurch Earthquake

Main quake:4 September 2010, 4.30am. M 7.1. No deathswww.all-geo.orgPreStressed Timber Limited info@prestressedtimberltd.co.nzThe Christchurch Earthquake

Design spectrum1.00.51.50.0Spectral acceleration (g)0.01.02.03.04.0Building period (s)PreStressed Timber Limited info@prestressedtimberltd.co.nzThe Christchurch EarthquakeDamage to the city

PreStressed Timber Limited info@prestressedtimberltd.co.nz

What does Christchurch Look like now?Courtesy of W. Y. KamPreStressed Timber Limited info@prestressedtimberltd.co.nzTimber Structures in the CHCH EQWhat does Christchurch look like now?

Courtesy of W. Y. KamPreStressed Timber Limited info@prestressedtimberltd.co.nz

Courtesy of M. TaylorPreStressed Timber Limited info@prestressedtimberltd.co.nzTimber Structures in the CHCH EQWhat does Christchurch look like now?

Courtesy of M. TaylorPreStressed Timber Limited info@prestressedtimberltd.co.nzCurrent seismic design practiceOur current design choicesEarthquake engineering philosophy Minor earthquakeNo damageModerate earthquakeRepairable damageBig earthquake No deaths, Damage is okNot good enoughSociety wants morePreStressed Timber Limited info@prestressedtimberltd.co.nzCurrent seismic design practiceOur current design choices

This building displayed almost prefect good seismic behaviorDemolishedCourtesy of S. PampaninCourtesy of S. PampaninPreStressed Timber Limited info@prestressedtimberltd.co.nzCurrent seismic design practiceThis was our choice for Christchurch following a major earthquake

Repair is just too expensive, and people are nervous about the resultsCourtesy of A. BuchananIs this Smart? Or Sustainable?PreStressed Timber Limited info@prestressedtimberltd.co.nzWe need to shift the goal postsUpdating our thinking to performance based design

Higher expectations of modern society ( the three Ds): No victims nor collapse (Deaths) Minimum level of damage or direct costs (Damage = Dollars) Minimum business interruption and recovering (indirect) costs (Downtime)Courtesy of S. PampaninPreStressed Timber Limited info@prestressedtimberltd.co.nz

PREStressed LAMinated Timber:

GLUe LAMinated: GLULAMCROSS-LAMinated: CROSS-LAMSmith et al. PreStressed Timber Limited info@prestressedtimberltd.co.nz

Bill and Ben at 10 TVNZondemandPreStressed Timber Limited info@prestressedtimberltd.co.nzPres-LamDamage Limiting System

(c/o Miss S. Nakaki)(Palermo et al. 2005) Originally conceived for reinforced concrete (PRESSS) Combination of post-tensioning cable and (in high siesmic areas) internal or external reinforcing Separates ductility from material damagePreStressed Timber Limited info@prestressedtimberltd.co.nz

DemolishRepairPres-Lam now thats SmartDamage Limiting SystemPres-Lam changes the way in which a system remains following earthquake loading, replacing damaged reinforcing following a major eventCourtesy of S. PampaninCourtesy of A. BuchananPreStressed Timber Limited info@prestressedtimberltd.co.nz

Testing of Pres-Lam SystemsWall systems

Pres-Lam walls with internal and external reinforcing.Testing has also been performed on the transfer of forces within a Pres-Lam frame, Economics of connections.

Sarti et al. Moroder et al.PreStressed Timber Limited info@prestressedtimberltd.co.nzTesting of Pres-Lam SystemsMoment Cross-Lam Stairwell

Dunbar et al. PreStressed Timber Limited info@prestressedtimberltd.co.nzPres-Lam in PracticeThe first Pres-Lam Building in the World

Courtesy of A. BuchananArchitect: Irving Smith Jack, Engineer: AureconPreStressed Timber Limited info@prestressedtimberltd.co.nzPres-Lam in PracticeThe first Pres-Lam Building in the World

Photo: Irving Smith Jack ArchitectsArchitect: Irving Smith Jack, Engineer: AureconPreStressed Timber Limited info@prestressedtimberltd.co.nzPres-Lam in PracticeThe first Pres-Lam Auditorium in the World

Photo: Carterton District CouncilArchitect and Engineer: Opus InternationalPreStressed Timber Limited info@prestressedtimberltd.co.nzPres-Lam in PracticeA gravity dominated Pres-Lam Frame

Architect: Athfeild Architects, Engineer: Dunning Thornton ConsultantsPhoto: Trends Magazine NZPhoto: Trends Magazine NZPreStressed Timber Limited info@prestressedtimberltd.co.nzPres-Lam in PracticeOther Examples of Pres-Lam

Concrete Columns, Timber Beams and Base IsolatedCross-Lam Panels incorporating sections of LVLPres-Lam Frames onlyArchitect: Rick Proko, Engineer: RuaumokoArchitect: Design Base, Engineer: Nelson Timber SolutionsArchitect: Sheppard and Rout, Engineer: Kirk RobertsPreStressed Timber Limited info@prestressedtimberltd.co.nzCurrent Trends in Timber DesignThe Worlds getting Taller

Reiulf Ramstad Arkitekter As

mgb ARCHITECTURE + DESIGN Equilibrium, LMDG Ltd, BTY Group

SOM Skidmore Owings and Merrell Norway Canada USABarentshus Tower Tall wood proposal Timber Tower ChicagoPreStressed Timber Limited info@prestressedtimberltd.co.nzThese arent just pipe dreams

55 m - 15 storey - All timber building Pres-Lam wallsPreStressed Timber Limited info@prestressedtimberltd.co.nzTime and cost of constructionRenewable resourceCarbon negativeLight weightLovely appearanceExcellent performanceWhy is wood smart? Re-building Christchurch

PreStressed Timber Limited info@prestressedtimberltd.co.nz26

Half of national wood production is exported as logsIs that smart?Why not export pre-manufactured buildings?Forestry in New Zealand

PreStressed Timber Limited info@prestressedtimberltd.co.nzExporting Kiwi Technology and Timber

A timber building Grown in New ZealandProcessed in New ZealandPre-fabricated in New ZealandGround broken in Japan to be erected in June

PreStressed Timber Limited info@prestressedtimberltd.co.nzConclusions

PreStressed Timber Limited info@prestressedtimberltd.co.nz29Conclusions

PreStressed Timber Limited info@prestressedtimberltd.co.nz30Conclusions

The more trees we plant, and grow, and harvest, and use, and replant, the better

for our health, wealth, and a sustainable planet

PreStressed Timber Limited info@prestressedtimberltd.co.nz31Pres-Lam in PracticeThe Largest Pres-Lam Building

Photo: Conorboyd PhotographyArchitect and Engineer: Opus InternationalPreStressed Timber Limited info@prestressedtimberltd.co.nz

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