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History of Skyscrapers
Who Builds Skyscrapers?
Skyscrapers vs Nature
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AHR keh aluminum or stainless Antenna architects beams and columns big concrete block building sway building's sway Buildings and Urban built Caissons Chicago fire city's building CN Tower completion in 2003 construction conventional buildings Council on Tall Council's standard cranes crews elevators Empire State Building Engineers Equitable Building feet 61 fireproof materials floors foot 929 sq force of compression foundation glass and aluminum ground Jin Mao Building Kuala Lumpur load Malaysia Modern skyscrapers motion sickness Petronas Towers plumbing Sears Tower Shanghai sidewalk level skyline skyscraper frame skyscraper's frame skyscraper's superstructure soil space spires sq cm square foot 929 stainless steel steel beams steel frame steel skeleton structural peak structural piece support the weight swing tall building taller true skyscraper tuned mass dampener urban canyons Urban Habitat walls waterproof chamber weight falls wind force windy Woolworth Building workers World Trade Center world's tallest building world's tallest skyscrapers York