New Zealand ExperienceAsif Iqbal

BRANZ, Wellington

Workshop on Engineering Resilient Tall CLT Buildings in Seismic Regions

January 24, 2014

Seattle WA

Presentation Summary

• Contents

• Introduction and prospects of wide-spread applications in the region

• Break out discussion

• Social Needs and cost effectiveness

• Performance Expectations

• Engineering Challenges

• Key words

• Innovative applications, Market acceptance

Presentation 1: NEES-CLT Project Overview (15min)

Presentation 2: CLT for Northwest U.S. (30min)

Presentation 3: Development in Canada (30min)

Coffee break

Presentation 4: Performance requirements and codify

efforts (30min)

Presentation 5: New Zealand Experiences (30min)

Coffee break

Presentation 6: Resilient system concepts (35min)

Feasibility of New Zealand CLT

Re: Fortune & Quenneville (2007)• Successfully fabricated

• Typical failure patterns

• Predictable MoE values

Initial Tests at UoC

• Characteristic flexural properties

• Compressive strength

Re: Millen & Carradine (2010)

PRES-Lam Walls

PRES-Lam Walls in Applications

Courtesy: Opus Consultants and Michael Newcombe

Christchurch Earthquake: Building Collapse

Christchurch Earthquake: Shear Wall Failure

Christchurch Earthquake: Stairs Unseating

Christchurch Earthquake: Engineered Wood Structure

Courtesy: Andy Buchanan

Rebuilding Christchurch: with Wood

Re-building Christchurch: St Elmo Courts

Rick Proko Architects, Ruamoko Engineers

St Elmo Courts: Composite Structure

Rick Proko Architects, Ruamoko Engineers

Rick Proko Architects, Ruamoko Engineers

St Elmo Court: Wood-Concrete Frame

Christchurch Rebuild: Merritt Building

Merritt Building: Structure

Courtesy: Andy Buchanan

Merritt Building: Structure

Courtesy: Andy Buchanan

Christchurch Rebuild: Merritt Building

CLT Core: High Seismicity Option

Courtesy: Andrew Dunbar

CLT Core: Low Seismicity Option

Courtesy: Andrew Dunbar

CLT Core: Test Specimens (UoC)

Courtesy: Andrew Dunbar

CLT Core: Sample Plots

Courtesy: Andrew Dunbar

CLT Manufacture in NZ: The Beginning

Courtesy: XLam NZ

CLT manufacture in NZ: Tests

Courtesy: XLam NZ

CLT manufacture in NZ: Technical Reference

Re: XLam NZ

CLT manufacture in NZ: First CLT Floor

Kaikoura District Council Building

Museum, library, council offices, Kaikoura DC

All timber. No concrete. Post-tensioned CLT walls.

Courtesy: Andy Buchanan

Post-tensioned CLT walls for all lateral loads

Kaikoura District Council Building

Courtesy: Andy Buchanan

CLT in Australia: Docklands Library and Community Centre

Courtesy: City of Melbourne

CLT in Australia: Forte Melbourne

Courtesy: Lend Lease

CLT imported from Europe (KLH)

• Potential New Manufacturers: European

• Potentially more New Zealand manufacturers

• FWPAA Publications: CLT Design Guide, Life Cycle Assessment

• Expansion of Market: Asia, Middle East

CLT in Australasia: Latest Thoughts

SCION-BRANZ Study (2013) on CLT in NZ

SCION-BRANZ Study (2013) on CLT in NZ

• Estimated annual demand 38000m3 (2012)

• Projected annual demand 46000m3 (2018)

• Additional 750m3 for 1% market penetration, 1500m3 in non-cost effective solutions

• Cost competitive for non-residential buildings

• Concentrated around Auckland and Christchurch

SCION-BRANZ Study (2013) on CLT in NZ

Other BRANZ Research involving CLT

• Better building construction

• Improvement in quality and productivity

• Innovation: new materials and techniques

• Strategies and industry transformation

New BRANZ Research Project on CLT

• New 3-yr long project initiated

• Scoping and market study in the 1st phase

• New developments and testing in 2nd phase

• Particular attention on connection details

• Guidelines and knowledge transfer through 2nd and 3rd phase

UoA Initiative

• Optimization of hygrothermal performance of CLT

• Experimental investigation and numerical modelling

• To determine manufacturing methods that can reduce the adverse effects

• To determine best practice procedures for on-site protection

Summary

• Progress has been made and further prospects lie ahead

• Research findings and case studies have confirmed the potential

• Recent experiences with concrete buildings is a significant factor

• Key issues for CLT implementation: acceptance within the engineering community, compilation and dissemination of knowledge

• Technically attractive, commercial competitiveness yet to be tested

Acknowledgement

• University of Canterbury, BRANZ, XLam NZ Ltd

• Many thanks to ARUP Local Office for providing the venue and organizing assistants to this workshop.

• The workshop is supported by National Science Foundation under George E. Brown Jr. Network for Earthquake Engineering Simulation Research (NEESR) Program. (Awards CMMI: 1344617; 1344646; 1344798; 1344590; 1344621). The financial support is greatly appreciated. The views and conclusions resulted from the workshop does not reflect the view of the sponsors.

Questions