High-Tech Skyscrapers Could be Built with Low-Tech Wood

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iStock

When we think of wood construction, we often think of log cabins, tree houses, or the framework of residential properties. But if a new start-up has its way, we might soon be gazing up at 12-story buildings made almost entirely out of Douglas firs.

In a report for CityLab, journalist Amanda Kolson Hurley profiled Portland, Oregon's Lever Architecture, a firm attempting to revitalize wood-based towers that reduce the carbon footprints of conventional buildings. Their offices are located in a four-story property made from wood; their next major project, titled Framework, is expected to be 12 stories and slated to debut in Portland in 2019.

Part of Lever’s goal is to reduce concerns over wooden structures—namely, that they’re prone to fire hazards or might not be structurally sound in an earthquake. Developers use a building material called mass timber, a special type of strengthened wood in which timber panels are glued together to make beams and cross-set layers for walls and floors. Fire tests have shown the mass timber doesn’t ignite easily: It chars, which can insulate the rest of the panel from the heat. Strength testing has shown the layers aren’t easily jostled by outside forces.

Lever’s architects hope that wooden buildings will lessen the environmental impact of commercial towers that use concrete and steel, which are responsible for 10 percent of greenhouse gas emissions during their manufacturing.

Other firms have designs on taller buildings, including one 35-story tower in Paris and a 24-story building in Vienna.

[h/t CityLab]

Shanghai Is Now Home to the World’s Longest 3D-Printed Bridge

World's largest 3D-printed bridge in Shanghai, China.
World's largest 3D-printed bridge in Shanghai, China.
Tsinghua University

Small items like toys and shoes aren't the only things 3D printers can make. As a team of architects from China's Tsinghua University School of Architecture recently demonstrated, the machines can be used to print sturdy bridges large enough to span waterways.

As dezeen reports, at 86 feet in length, the new pedestrian bridge on a canal in Shanghai's Baoshan District is the longest 3D-printed bridge on Earth. Designed by the university's Zoina Land Joint Research Center for Digital Architecture (JCDA) and constructed by Shanghai Wisdom Bay Investment Management Company, it consists of 176 concrete units. The parts were printed from two robotic-arm 3D-printing systems over 19 days.

The 3D-printing technology cut down on costs as well as construction time. According to Tsinghua University, the project cost just two-thirds of what it would have using conventional materials and engineering methods.

Even though their approach was futuristic, the architecture team paid homage to a much older bridge in a different part of the country. The new bridge's arched structure is inspired by that of the 1400-year-old Anji Bridge in Zhaoxian, the oldest standing bridge in China (and the world's oldest open-spandrel arch bridge).

The bridge in Shanghai may be the longest 3D-printed bridge in the world, but it isn't the first. Last year, a 3D-printed steel bridge was unveiled in Amsterdam.

[h/t dezeen]

A Clue on the Ceiling of Grand Central Terminal Shows How Dirty It Was 30 Years Ago

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iStock.com/undercrimson

The mural above the concourse at Grand Central Terminal is one of the most gawked-at ceilings in New York City, but even daily commuters may have missed a peculiar feature. Tucked at the edge of the green and gold constellations is a rectangular black mark. The apparent blemish didn't get there by mistake: As Gothamist explains in its new series WHY?, it was left there by restorers when the ceiling was cleaned more than 20 years ago.

Prior to the Metropolitan Transportation Authority's renovation of Grand Central in the 1990s, the concourse was a lot dirtier. The station itself was constructed in Manhattan in the early 1900s, and the celestial scene that's on the ceiling today was painted there in the 1940s. It took only a few decades for tobacco smoke and other pollutants to stain the mural so badly that it needed to be restored.

Using Simple Green-brand cleaning solution and cotton rags, conservators spent two years scrubbing nearly every inch of the ceiling back to its former glory; the one part they skipped was a 9-inch-by-18-inch patch in the northwest corner. Sometimes, when doing a major cleaning project, preservationists will leave a small sample of the art or artifact untouched. If the cleaning products did any damage to the paint, the patch gives future preservationists something to compare it to. It also acts as a snapshot of what the mural looked like in its old condition.

To hear more about the mural and its dirty secret, watch the video from Gothamist below.

[h/t Gothamist]

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