The skyscraper structural system was designed as a hybrid structural system, comprising a combination of both tubular and rigid structural frames. This type of structural system is typical for most high-rise buildings. It consolidates the structure due to the various support systems that keep the building very rigid.
The structural columns in every edifice serve as load-bearing elements and as well transfers vertical loads to underlying supporting structures. The interior columns were designed as concrete members and typically help to resist gravity loads coming on and from the skyscraper. Due to the shape complexity of the structure and increasing gravity loads on lower floor levels, more interior columns are present below what we call “the belly” which is the protruded part from the ground floor to the 40th floor of the skyscraper. So, as you progress in height, the number of interior columns reduces in plan.
Another important supporting structure is the lift shafts which typically help transmit lateral and gravitational loads to the founding structure. Also, to note, the interior structures were automated to avoid redundant and tiring tasks.