by Web Editor | Jun 7, 2017 | News
Officials in Oregon have approved construction permits for the first all-wood high-rise building in the nation. Construction on the 12-story building, called Framework, will break ground this fall in Portland’s trendy and rapidly growing Pearl District and is expected to be completed by the following winter.
The decision by state and local authorities to allow construction comes after months of painstaking testing of the emerging technologies that will be used to build it, including a product called cross-laminated timber, or CLT.
To make CLT, lumber manufacturers align 2-by-4 boards in perpendicular layers and then glue them together like a giant sandwich before sliding the resulting panels into a massive press for drying. The resulting panels are stronger than traditional wood because of the cross-hatched layers; CLT can withstand horizontal and vertical pressures similar to those from a significant earthquake with minimal damage. They also are lighter and easier to work with than regular timber, resulting in lower cost and less waste.
For this project, scientists at Portland State University and Oregon State University subjected large panels of CLT to hundreds of thousands of pounds of pressure and experimented with different methods for joining them together. The project materials also underwent extensive fire safety testing and met fire codes.
State officials hope the building will stir greater interest in high-rise construction using mass timber and help revitalize the state’s lagging logging industry. Logging, once a major source of revenue in Oregon, has dropped sharply in the past few decades because of greater environmental protections for salmon and the spotted owl. The loss of the industry has devastated some of the state’s rural communities.
From The Register-Guard: https://registerguard.com/rg/news/local/35651365-75/portland-approves-permit-for-nations-first-all-wood-high-rise.html.csp
by Web Editor | Jan 18, 2017 | News
Mass timber is sprouting up in cities in North America and abroad. After years of feasibility studies and design proposals, buildings six stories or taller constructed primarily from pre-engineered wood products are being considered in cities around the world.
In London, one proposal, called the Splinter, would rise to 100 stories. In Chicago, Perkins+Will (in collaboration with Thornton Tomasetti and the University of Cambridge) has designed an 80-story high-rise with 300 duplex apartments. If built, River Beech—a key component of P+W’s master plan for the Riverline development—would be made almost entirely from mass timber.
So-called “plyscrapers” are still a tiny sliver of nonresidential construction. In the past five years, only 17 buildings seven stories or taller have been completed worldwide, mostly in Europe and Canada. Six more have started construction, according to the American Wood Council.
Mass production of timber for high-rise construction is still in its infancy in North America. Specifying these products in the U.S. faces resistance from insurers, regulators, and code officials. Steel fabricators and concrete suppliers disparage mass timber for taller buildings on the grounds of safety and durability.
Proponents cite the speed at which tall buildings can be constructed using pre-engineered wood and mass timber’s ability to sequester carbon. Joey-Michelle Hutchison, RA, LEED AP BD+C, CSBA, Associate Vice Principal, CallisonRTKL, says, “The role of mass wood is going to grow because of the demand for sustainable design.” Researchers from Yale and the University of Washington, in a study published in the Journal of Sustainable Forestry (March 28, 2014), postulated that using wood substitutes for constructing buildings (and bridges) could save 14–31% of global CO2 emissions.
From Building Design + Construction: https://www.bdcnetwork.com/mass-timber-what-heck-wow
by Web Editor | Feb 20, 2015 | News
From: Panel World Staff
Oregon State University has begun an initiative to build a $60 million complex to accelerate its forestry education programs and research on advanced wood products at Corvallis, Ore. The Oregon Forest Science Complex will encompass renovation of existing OSU campus facilities as well as new construction; showcase innovative uses of wood in building design; and allow the College of Forestry to help meet the world’s growing demand for energy efficient, tall buildings made from sustainable building products.
The project includes a $30 million fundraising goal. Once philanthropic commitments are secured, OSU will seek matching bonds from the state. Bonding for the project was included in the governor’s capital budget for consideration in the upcoming legislative session.
The initiative was announced in Portland at the Oregon Leadership Summit of the Oregon Business Plan by Thomas Maness, the Cheryl Ramberg Ford and Allyn C. Ford Dean of the College of Forestry.
“We are excited about leading a new national effort to advance the science and technology necessary to primarily use wood in the construction of 5- to 20-story buildings,” Maness says. “Developing these new, competitively priced, environmentally friendly products will not only increase the value of Oregon’s natural resources, but also grow jobs in our rural communities, with substantial benefits for our state.”
Seeking new methods to reduce the carbon footprint of high-rise construction, architects and engineers from Austria to Canada, Norway and New Zealand have begun constructing buildings with exceptionally strong wood products. This cross-laminated timber is made of strips of wood glued together across the grain, and panels can be more than 1 foot thick and 80 feet long.
Read more on this story in the March issue of Panel World…
