Skyscrapers are built primarily because they are convenient; one can create much real estate from a relatively small ground area.
The central support structure of a skyscraper is its steel skeleton. Steel, which is lighter and stronger than iron, makes it possible to build taller buildings. As a result, steel buildings have become more prevalent in recent years.
With the advent of the Bessemer process, the first efficient method for mass steel production, architects moved away from iron.
Fighting the Wind
Where the horizontal girders are attached to the vertical column, the construction crew bolts and welds them on the top, bottom, and side. This makes the steel structure move as one unit, like a pole, as opposed to a flexible skeleton.
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