1 Tall Wood – CLT and Code Issues in Seattle Hans-Erik Blomgren PE SE P.Eng. Struct.Eng. Presentation For: White House Wood Workshop March 18, 2014 Who Arup is • A global, independent, multidisciplinary firm of professionals working together to tackle complex planning, infrastructure and building design challenges • 10,000 engineers, designers, planners, management consultants and economists • 90 networked offices in 37 countries • Full service from concept through completion “To strive for quality in only a part is almost useless if the whole is undistinguished” - Ove Arup 3 What is your perception of wood? Light duty? Termite food? Decays? Combustible? Shrinks, warps, & splits? 4 © Arup © Arup Source: dDRMM 5 Source: Jeff Hudak © Arup © Arup Source: Arup Source dDRMM 6 Metropol Parasol, Seville 7 Source: Arup Source: Arup Source: Arup Source Arup © WoodWorks © CREE Source: WoodWorks Source: CREE Source: Structurlam © CREE © Structurlam Source: CREE 8 Cross-Laminated Timber Mass-Timber Glulam Panels comprised of dimensioned lumber Attributes: • • • • • • • • • • 9 Strong Dimensionally stable Fire resistive Large format sizes Pre-fabrication Fast construction Clean & quite construction sites Cost competitive Carbon sequestration Locally sourced in the PNW Cross Laminated Timber 10 Cross Laminated Timber – Seattle DPD 11 Source: Joe Mayo (Mahlum) Lifecycle Tower 2008 - Austria 12 Source: Arup, CREE Fire Testing 13 LCT – Timber Concrete Composite Floors (Source: CREE) LCT 1 - Prefabrication 14 Source: CREE LCT One – Construction -1 floor / day 15 Source: CREE LCT One – Finished Interior 16 Source: CREE 17 CLT Case Study for Seattle April 2013: Sellen – Arup – Weber Thompson Fire Testing Research 18 NFPA Research Grant – Lead Author - Arup Building Regulations in Timber 19 Source: Arup Performance Based Design - Fire • Technical justification 20 NSF/NEES Research - CLT Seismic Systems 21 NSF/NEES Research: CLT Seismic Systems 22 Coupled Vertically Post-Tensioned Shear Walls – (Source: STIC) 23 Nelson Marlborough Institute of Technology Building, NZ (Source: STIC) 24 Merritt Building – Christchurch – Post-Tensioned Moment Frame (Source: STIC) 25 Merritt Building – Christchurch – Post-Tensioned Moment Frame (Source: STIC) 26 Canada – Developer Led EOI for 10 Storey or Taller Wood Building To Summarize: • The Drivers: • Reduced Environmental Impact • Lower 1st Cost – Thru Fabrication Technology • Overcoming Perceptions Issues • Wood can be used technically • Prescriptive vs. Performance Codes • System-Level Innovation is Required • • • • • Structural/Seismic Fire Acoustics Building Envelope Manufacturing • Investment is Needed 27 • US government spending on building science is 0.001% of overall innovation spending. • Yet buildings represent 49%of GHG emissions and 47% of energy use. • The Pentagon has stated that climate change is the single biggest threat to global security. • So, given the level of importance, investment for building science research to reduce climate impact and energy use, both at the public and private research level, is essential to the future of any progressive economy. 28 Source: Michael Green 29
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