When the next major earthquake roils our region, University of Washington’s civil engineers and seismic experts will not be safe.
That’s because their building is vulnerable to earthquakes.
More Hall was built in 1946 before modern building codes were in place and, as a result, the building’s concrete columns could explode like a fallen fine china during an earthquake.
“We make it worse,” joked John Stanton, civil engineering professor. “We stack books up on the shelves so they can fall on us, as well.”
Stanton and his colleagues advise the Washington State Department of Transportation on how bridges will perform during earthquakes. They have won awards in the field of earthquake engineering. Their work obsesses over the best way to design buildings to withstand seismic forces.
“The irony is absolutely there,” Stanton said. “We would love to work in a safer place. That’s a question of money and politics.”
UW spokesperson Victor Balta downplayed the risk of More Hall and other buildings like it.
“It is true that More Hall was not built to today’s seismic codes, but then again very few buildings were as codes continue to change,” he said by email. The university’s first priority, however, is dealing with shoring up its older brick buildings (known as unreinforced masonry) over the next six years.
“After we take care of all the unreinforced masonry, we will be able to move on to other seismic issues, many of which will involve very extensive renovations,” Balta said.
Stanton gave a reporter a tour of More Hall, deciphering the building’s cracks and warps as if with X-ray vision. (Actually, he’s seen the architectural drawings.) They look like this:
All those numbers in the top right show the building’s columns are “woefully unreinforced,” according to Stanton.
Concrete columns in buildings up to modern code have a “bird cage of reinforcement” inside them, Stanton said. If you wrap a column in steel, it strengthens the concrete and keeps it together during an earthquake.
There is nowhere near enough steel latticework inside the columns of More Hall to make the building withstand a large earthquake, Stanton said. In contrast, wrapping a column in steel makes it ductile and bend like a paperclip during an earthquake.
That’s why structural engineers call More Hall a “non-ductile concrete building.”
“Death boxes” is the term preferred by international seismic engineering expert Kit Miyamoto.
Columns built before the mid-70s don’t have much steel reinforcement, so they don’t bend. Instead, they are known to explode.
“Yes, it does explode,” he said. Miyamoto spoke to me from Los Angeles where he serves on the California Seismic Safety Commission. “It’s a big, just sudden failure. It’s not like you’re going to see cracks happening. It just suddenly ruptures.”
Last September many buildings like this collapsed in Mexico during a 7.1 earthquake.
Aquí el momento donde un edificio, al parecer en la Colonia Roma colapsa. pic.twitter.com/rAYKX0lJjm
— REFORMACOM (@Reforma) September 19, 2017
A Mexican news site tweeted a video showing a beige, five story-apartment building that wobbles and then crumbles to the ground in a cloud of dust.
Sounds of “Dios mio, dios mio, dios mio,” Oh my god, oh my god, come from a woman watching.
In that earthquake, 44 buildings collapsed, 6,000 buildings were damaged, and close to 400 people died.
Everett-based structural engineer Dave Swanson visited Mexico to study the damage.
“When people look at a large massive concrete building they think, oh it’s really strong, and it’s going to be very reliable,” Swanson said. “But I’ve witnessed earthquakes around the world throughout my career where buildings that you think are very reliable and strong actually aren’t.”
No one knows just how many buildings like this are in the Seattle area. But “there are a lot of them,” Swanson said, certainly in the thousands.
Unreinforced masonry have gotten attention from local leaders, but the City of Seattle does not have a program to address vulnerable concrete buildings. The city says unreinforced masonry seem to suffer more in the earthquakes that have struck here.
“They get damaged in smaller earthquakes,” said Wendy Shark of the Seattle Department of Construction and Inspections. “Even in a small earthquake like Nisqually, two-thirds of the buildings that were initially red-tagged” — unsafe to occupy — “were URMs.”
Swanson is glad leaders are focusing on brick structures, but concrete ones need attention too, he said, as they are often large structures used by many people at the same time.
More Hall is not the only building on campus that needs seismic improvement. The University recently put out a call for bids to work on 11 unreinforced masonry buildings.
Hazard maps show the ground under the University of Washington’s Seattle campus is prone to liquefaction and will likely get a lot of shaking.
What would it take to bring More Hall up to current codes?
Joking, Stanton responds with dark humor: “A large bomb. Build a new one.”
Original Article: The ‘death box’ where Seattle earthquake researchers work