![]() At this slenderness ratio, a 12-inch ruler standing on end would be slightly more than 1/2 inch wide. New “super-slender” towers in NYC have slenderness ratios up to 1:23.(63.7 meters) on a side, yielding a slenderness ratio of 1:6.5. The original World Trade Center (WTC) north tower (not including antenna) was 1,368 ft.(129.2 x 57 meters), for a slenderness ratio of 1:2.95. (381 meters) tall Empire State Building (not including antenna) occupies a full city block site measuring 424 x 187 ft. New York City’s Skyscraper Museum () defines “slenderness” as the ratio of the width of a building’s base to its height. Both can help make the building more comfortable for its occupants, particularly on the upper floors. Slosh dampers can help absorb vibrations. ![]() For example, mass dampers installed on an upper floor can be tuned to move out of phase with wind-induced forces and thereby reduce sway.
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