The core barrels is in the central part of the building. It is surrounded by elevator shafts, stairs, ventilation shafts, cable shafts, public toilets, and some equipment rooms to form the central core barrels, which forms an outer frame and inner tube structure with the outer frame, and is poured with reinforced concrete. This kind of structure is very conducive to structural forces and has excellent shock resistance. It is the mainstream structural form widely adopted by super high-rise buildings in the world. At the same time, the advantage of this structure is that it can strive for as wide a space as possible, so that various auxiliary service spaces are concentrated in the center of the plane, so that the main function space occupies the best lighting position, and achieves good visibility and convenient internal transportation. Effect.

The core barrels consists of a beam tube hollow core barrels composed of reinforced concrete dense columns and a solid web core barrels composed of reinforced concrete shear wall type. Reinforced concrete core barrels—In steel frame structures, the concrete core barrels is mainly used to resist horizontal lateral forces. Due to the material characteristics, the cross-sections of the two components are quite different. The lateral rigidity of the reinforced concrete core barrels is much greater than that of the steel frame. As the floors increase, the core barrels bears a greater proportion of the horizontal load acting on the building. The steel frame part mainly bears the vertical load and a small part of the horizontal load. As the storey increases, the steel frame bears the smaller proportion of the horizontal load acting on the building. Due to the high steel strength, it can effectively reduce the column section and increase the use of the building. area.

Excessively increasing the rigidity of the core barrels to form a weak steel frame structure system will cause the concrete wall to crack under the action of strong earthquakes, and the overall lateral stiffness of the structure will drop rapidly. The frame's load-bearing capacity deviates from the design expectations of the structural designer, and its damage is very serious or even collapses.