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X-bracing is astructural engineering practice where the lateral load on a building is reduced by transferring the load into the exterior columns.
X-bracing was used in the construction of the 1908Singer Building, then the tallest building in the world.[1]
Some skyscrapers by engineerFazlur Khan, such as the 1969John Hancock Center, have a distinctive X-bracing exterior, allowing for both higher performance from tall structures and the ability to open up the inside floorplan (and usable floor space) if the architect desires.[2]
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