Wilshire Grand Center is a 1,100-foot (335.3 m) skyscraper in the Financial District of Downtown Los Angeles, California, occupying the entire city block between Wilshire Blvd. Joseph compares the latter elements to the arms and poles of a skier, providing balance on the slopes. “You can feel this effect when repeatedly bending and unbending a paper clip,” says Joseph. The geotechnical tests also informed specifications for laying the foundations -- which would set a new world record the When the earth moves, even the grandest structure goes with it, and engineers must plan to adapt.

"Kang adds that emerging methods are further expanding the possibilities of earthquake engineering. "This has enabled the profession to conduct more simulations (and) the database for ground motion records has increased tremendously. It reaches five levels underground and then 850 feet into the air. Just as is required when installing shock absorbers in a car, the topmost braces had to be compressed for installation, which required loading them with 1 million pounds of force each.

But along with seismic resistance, it’ll also have to handle wind forces that other buildings do not, due to its unusual shaping.

New Wilshire Grand Center skyscraper—the tallest in the western US—may wobble in a big quake, but it shouldn’t fall down. Architect AC Martin designed the building with a cigar box shape to meet the needs of a hotel, with long corridors for guest rooms on each floor. "The design team settled on a plan for a concrete core with a steel perimeter frame, connected by braces known as outriggers at three levels of the tower. Then Joseph … Elevators will zip guests to the 70th floor in just 50 seconds, where the InterContinental Downtown Los Angeles will keep its lobby—guests will actually take the elevator The roof will also have an open-air plaza so guests can enjoy the views and the Los Angeles climate.
“The same thing occurs as the long inner steel bar of a buckle-resistant brace cycles through stretching and squashing.” That absorbs energy and dampens the structure’s movement.Though these braces have been used before, clustering four huge braces in a group created the highest capacity system in the world, with a yield strength of 8.8 million pounds per outrigger.

Designed by architect, David Martin, the Wilshire Grand has large windows on every floor, which required the construction of a concrete core and further complicated the earthquake resistance of the skyscraper. To boost the foundation and make it more of an earthquake proof building, engineers incorporated 980 piles — some nearly 300 feet deep — secured within 2.15 million cubic feet … "The Wilshire Grand features a seismic joint between the base and the tower that allows for 1.5 feet of sway without causing damage to partitions or pipework. Earthquake-proofing the tallest skyscraper in CaliforniaThe new arrival will still fall short of East Coast skyscrapers such as New York's One World Trade Center (1,776 feet), and even the Empire State Building (1,250 feet), built in 1931. These shock-absorber-like structures are attached to the floors on levels 27, 53-59, and 70So engineers used braces that yield, stretching and squashing like taffy. “It’s a big building, and because it’s a hotel with all the rooms facing outside, it’s very slender,” says Chris Martin, CEO of design firm AC Martin Partners, which has helped shape the LA architectural landscape for a century. The Wilshire Grand will contain office space, leisure amenities and a 900-room hotel. "The engineer does not expect the building to emerge from a major earthquake completely unscathed, and planned for a degree of damage. David McNew/Getty Images North America/Getty Images But the billion-dollar hotel, office, and retail tower, funded by Korean Air, will also be one of the most advanced in the world when it comes to seismic engineering—something all buildings in the region need to worry about. The Wilshire will need to withstand earthquakes up to roughly magnitude 7.4, which could be generated by the San Andreas Fault 46 miles away—though a fault line just a quarter-mile away from the site, the Upper Elysian Park Thrust, could cause a magnitude 6.4 quake. "A thinner spire would have been lovely, but it would fail under earthquake loads." "The overall shaking from the two sequences is not vastly different but the characteristics are. "It should roll with the punch. "A long and narrow building in an earthquake is quite stiff and strong in the long direction, but more flexible in the crosswise direction, so that was the challenge here. "There would be a whole bunch of cracking concrete at the end of these beams in an earthquake, but they hold together and don't drop on someone's head. (That’s strong enough to suspend 110 fully loaded trucks.) Hovering 178 feet above them will be the building’s recently-completed perforated white spire, illuminated by programmable colored lighting.In the event of an earthquake, people on those upper floors will be in for ride.

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