Vancouver goes for 12-storey
Mass Timber Construction up to 12 Stories Approved by Vancouver B.C. 市议会
Although a vast forest resource may have something to do with it, the adoption 在 加拿大 of mass timber for tall wood buildings is also in recognition of wood’s carbon sequestration potential, inherent insulation properties, 更轻的重量和, as evidenced by the fire testing undertaken since 加拿大 first embraced cross-laminated timber (CLT), 它的防火性能.
The City of Vancouver, allowing from July 1st, 2020, mass timber construction up 12-stories for residential 和 commercial use, joins municipalities across British Columbia 和 many other countries around the world 哪一个 are embracing CLT for ‘green building’ as a contribution towards reducing their GHG footprint. 在B.C. that includes flagship projects such as the Brock Commons Tallwood House at the University of British Columbia, 哪一个, at the time of its construction was the tallest mass timber building in the world.
It is understood that not all combustible materials behave in the same way* 和 just as a tightly bound ream of paper does not have the same flammability as a single sheet, so it is with the combustibility of wood when comparing say a matchstick (wood matchsticks are dipped in flammable accelerant to sustain the burn following initial ignition) or piece of kindling with massive wood in the form of CLT.
Although the resistance to fire of large section timbers 和 glulam has long been recognised the use of CLT for multi-storey buildings has had to be thoroughly put to the test before its use has been permitted by building codes. 测试由 National Research Council 加拿大 和 FPInnovations have shown that CLT elements, with or without gypsum board protection, can achieve significant fire resistance, 有时超过3小时. Tests have also shown that fire stops approved for concrete construction are suitable for CLT elements, so long as adequate detailing is provided.
There has also been much research into fire in buildings in 加拿大 particularly given the adoption of CLT in multi-storey buildings with one such study ‘Structure Fires in British Columbia: Exploring Variations in Outcomes as a Function of Building Height 和 Life Safety Systems’, 哪一个 takes a closer look at the impact of building height 和 life safety systems, 报道了在 加拿大的消防工作.
The results may surprise those who equate taller buildings with increased fire safety risk. Not only did buildings with one to four storeys experience more 和 deadlier fires than taller buildings over the 13-year study period, but the damage 和 need for fire department intervention tended to decline the higher up in a building the fires started.
类似的, fires in buildings of any height with working smoke alarms 和 complete sprinkler protection tended to have relatively low rates of casualties, required less fire department intervention 和 were largely contained to the room of origin than fires in buildings without those systems. 阅读更多 …
*It must be considered as somewhat regrettable that it is the performance in fire of ACM cladding 哪一个 has led to the unfortunate 和 illogical UK Government decision to ban the use of CLT 在 建筑物外墙.