Posted on 02/20/2018 5:21:18 PM PST by nickcarraway
A Japanese company is planning to build the world's tallest wooden skyscraper with 90 percent of the building made of wood.
Sumitomo Forestry says its wooden high-rise — dubbed the W350 — will be 350 meters tall and the planned structure will be a hybrid of mostly wood and steel.
The 70-storey building, expected to be built in Tokyo, will comprise of stores, offices, hotels and private homes, the company noted in plans released earlier in February.
Sumitomo Forestry, which notes on its website that "happiness grows from trees," said it aimed to create environmentally-friendly, timber-utilizing cities which "become forests through increased use of wooden architecture for high-rise buildings."
Building with wood is still not cheap, however.
Using 185,000 cubic meters of timber, the building is expected to cost around 600 billion Japanese yen ($5.6 billion) which is twice the amount of a conventional high-rise building constructed with current technology.
Sumitomo Forestry However, the company believed that those costs would come down as timber became a more-frequently used material: "Going forward, the economic feasibility of the project will be enhanced by reducing costs through technological development."
Currently the tallest wooden building is 18-storeys high (53 meters) and serves as accommodation for students at the University of British Colombia.
Greenery will feature heavily in the building from Sumitomo Forestry with foliage connecting from the ground to top floors offering "a view of biodiversity in an urban setting."
The building plans show balconies that continue around all four sides of the building, giving a space "in which people can enjoy fresh outside air, rich natural elements and sunshine filtering through foliage."
With earthquakes not unusual in Japan, the building will incorporate a structural system composed of braced tubes made from columns, beams and braces "to prevent deformation of the building due to lateral forces such as earthquakes or wind."
Wooden cities The concept for the building has been prepared primarily at Tsukuba Research Institute, Sumitomo Forestry's research and development facility.
The institute is looking at the "expanding possibilities for wooden buildings as a road map for future technology, such as the development of building methods, environmentally-friendly technologies, and trees that become resources and building materials," the company said.
Sumitomo Forestry can trace its origins in the timber industry back to 1691 and the W350 building is planned to mark the company's 350th anniversary in 2041.
The company notes that forests cover approximately two thirds (68.5 percent) of Japan's land area. This puts it at second place among OECD member countries, behind Finland.
However, the self-supply rate for domestically-produced timber is only at around 30 percent, the company states, and Japan's forests are at risk due to insufficient maintenance.
"Although the large amounts of Japanese cedar and Japanese cypress planted after the Second World War have now reached the time for harvesting, they are being left in an un-maintained state as devastation of our domestic forests continues. It is crucial to use these trees and replant them after harvesting to encourage sustainability of forests," the company said.
Wood is a green, renewable resource.
Until it burns.
Wood is great fuel...
“Until it burns.”
That’s renewing it!
One word:
Termites
Fire trap. An arsonist dream.
Or will it all be particle and wafer board?
Godzilla will make short work of that.
Precisely.
Amazing. “Those guys are really smart. I’m surprised they lost the war.” Pete Rose.
The jokes just write themselves.
Hey Pete: The REALLY smart guys live in Switzerland, which has not lost a war since the Middle Ages ...
... and they don’t bet on base-ball either ...
:>)
Got wood?
What could possibly go wrong?
As a structural drafter for the last 31 years, I can say this is one of the craziest ideas I have ever heard.... ESPECIALLY there with the earthquakes they have. Highest I have done in wood, is 4 story wood hotels, think they were Comfort suites etc... I am not an engineer, but the problem with wood I think becomes the width to height ratio that kills the shear designs. Wind governs design here in Arizona, but pretty sure Seismic will there. The stuff I did in San Francisco years ago, out of concrete and only 24 stories high for the towers, were insanely reinforced. Barely enough room left to get concrete in after all the steel was in there. I have already sent this article on to a few different engineers I have worked with over the years to ask their opinions on it... Just seems insane to me!
“...the planned structure will be a hybrid of mostly wood and steel.”
That statement made me lose all interest...
I would guess it will be mostly manufactured lumber, like glu-lam beams etc. We use material known as micro lam which is for laminated studs when they get real tall and floor joists etc. in high stress areas when solid sawn lumber wont work and to keep depths down when architectural design dictates.
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