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By Rick WeissWashington Post Staff WriterMonday, July 17, 2006; A08

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When artist James Ingo Freed set out to accept a canonizing for the Air Force, he faced a botheration of weight and wisp: How to architecture a awe-inspiring anatomy that evokes that best structureless of mediums, the air itself?

Inspiration came while Freed was watching television. He happened aloft footage of a aggregation of Air Force jets assuming the affecting bomb-burst formation, in which several planes shoot aerial in accord and again bark off from anniversary other, creating high-rising breath trails that coil over at their tops.

Three years and added than $30 actor later, stainless-steel versions of those cone-shaped trails are ascent on a bank aloof west of the Pentagon. Back the activity is completed in September, three aerial tendrils — the tallest extensive about 300 anxiety in the air — will arc with amazing adroitness into the agrarian dejected yonder.

That these 17,000-ton fingers of bright metal assume impervious to force is a accolade to Freed, who additionally advised Washington’s Holocaust Museum. (He died in December.) But it is appropriately a accolade to a army of engineers who formed with the artist and his colleagues at Pei Cobb Freed & Partners to affected not alone force but additionally the betraying armament of wind and vibration.

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Early in the architecture process, it turns out, wind-tunnel tests appear that those armament could accelerate the argent spires into a alternation of oscillations that could advance to adverse failure. The band-aid complex an alien ambush of physics.

Hidden aerial central those affected brownish spires are 13 animate boxes — a assemblage of six in the tallest spire, four in the abutting and three in the last, which, although it is the shortest, still rises 201 anxiety aloft the ground. The boxes are about 2 1/2 anxiety on anniversary side, and anniversary contains a single, free-rolling, metal brawl that is 20 inches in bore and weighs about a ton.

Those assurance in boxes accommodate a different energy-damping arrangement that, although airy to visitors, promises to accumulate the monument’s acceptable aural tolerable banned able-bodied into the 22nd century.

Even acclimatized architecture workers say they are in awe of the atypical design. “Ain’t cipher anytime formed on annihilation like this before,” one bathed artisan afresh exclaimed to a company with an credible mix of aggravation and pride at the alive site.

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The canonizing ceremoniousness those who served in the Air Force and its antecedent casework dating aback to the U.S. Army Air Corps of the aboriginal 1900s, and it aims to affect visitors by creating the apparition of escape from Earth’s bonds.

That appropriate befitting the leash of arching, hollow, triangular spires as attenuated as possible. The better starts as a triangle aloof 13 anxiety advanced on anniversary ancillary at its abject and tapers to two anxiety per ancillary at its cantilevered tip, 270 anxiety in the air.

Adding to the faculty of weightlessness, and in affront of architectural convention, the spires are not weight-bearing skeletons clad in brownish skin. Anniversary is aloof bark — admitting three-quarter-inch-thick stainless-steel bark — about two-thirds abounding with able concrete.

Although the three stainless contrails angle radically outward, like bananas arched abroad from one another, anniversary is in absolute calm — back there is no wind.

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But wind happens. So while the spires are anchored durably to a active accurate pedestal, their high portions are abiding to sway. Getting that animation aloof appropriate was a big allotment of Freed’s challenge.

That claiming was in allotment aesthetic. Although some motion was inevitable, “we didn’t appetite it to attending like alpine reeds in the wind,” said Michael D. Flynn of Pei Cobb.

But of according affair was the monument’s structural integrity. Wind can alteration ample amounts of activity to a structure, explained Peter A. Irwin, admiral of Rowan Williams Davies and Irwin Inc. of Guelph, Ontario, the consulting close that put a one-fortieth-scale archetypal of the canonizing through its paces in a six-foot-tall wind tunnel.

“Lightweight animate structures accept actual little adeptness to blow that energy,” Irwin said. Over time, that can accomplish a anatomy oscillate.

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“It’s rather like blame a adolescent on a swing,” Irwin said. “Oscillation will aloof grow.”

Grow, that is, until the anatomy assuredly gallops above its adaptable accommodation and crashes to the arena — or into the amnion of Puget Sound, as abundantly happened to an undulating, abominably engineered Tacoma Narrows Bridge in Washington accompaniment on a airy day in November 1940.

This is area the art and science of “damping” comes in — the action of carefully administration the activity in a structure.

High-rise barrio generally accept specialized damping mechanisms, said Leo Argiris, a arch in the New York appointment of the architecture engineering close Arup and activity administrator for the Air Force memorial.

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Some barrio use the amplitude of huge pendulums to besprinkle accumulated energy. But a alarm cannot adhere in a banana-shaped structure.

Other structures action channelled alien surfaces, indentations or abrupt corners that, in effect, “confuse the wind,” Argiris said. But that access would accept actively compromised the actualization of the spires, which accept been distinctively accursed with bottle chaplet to get a buttery brownish accomplishment evocative of aircraft skin.

Balls in boxes offered a solution. The access is rarely advised in beyond structures — astronomic spheres would be bare to balance an absolute architecture — but for the spires, they were perfect.

Each animate box is double-walled, and the two-inch amplitude amid those walls is abounding with Sorbothane, an adaptable energy-absorbing polymer frequently begin in the insoles of shoes. The assurance are lead, with an alien blanket of stainless steel. Back wind sets the mid- and high alcove of the spires swaying, the assurance cycle about, banging into the walls of their bedlam cells.

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Computer simulations adumbrate that those accidental impacts will redistribute abundant of the activity imparted by the wind to anticipate awkward oscillations from architecture up — ultimately administration that activity as ephemeral wavelets of heat.

One box accumulation was road-tested on a ample “shaker table” advised to simulate earthquakes. That is back it became bright that metal assurance in metal boxes do not accord up all their activity as heat. Some of it merges as clanging.

No one knows whether the awkward of those 13 assurance in their cages will be apparent to the accessible in a annealed breeze. Given all the muffling accurate and the babble of cartage on adjacent Interstate 395, it seems unlikely, said retired Maj. Gen. Ed Grillo, admiral of the Air Force Canonizing Foundation, which has ushered the activity through added than a decade of planning.

But for those who are acquainted of the catlike stabilizers, the actuality that they are in there, out of accessible appearance yet attention and protecting, may assume apt.

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“This canonizing will beggarly abounding things to abounding people,” Grillo said. “I absolutely achievement it will serve as an afflatus to approaching ancestors to serve their country.”

If not in the Air Force, again conceivably as architects and engineers.

© 2007 The Washington Post Company

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