Ultimate capacities of core structure subjected to normal force and biaxial bending

Tall buildings represent the most ecconomical means of providing large numbers of people with modern housing in big cities, considering the scarcity of land and the cost of expanding or creating new cities, with all their requirements of other <services.They may be used for commercial purpose to provide <ecconomical means of accomodating the huge amount of office work involved with a big commercial companies or the various department of light manufacturing one In one building which will result in smoothing the daily work and increase the efficiency with less cost in communication, and transportation. The arrangement and form of any tall building. structure depends mainly on its function, height, and the type of loading to which it may be subjected during its useful life.As the height of the building increases, the lateral loads as well as the gravity loads tends to control the design. For medium height building up to twenty stories, a concrete rigid frame could be adequate in providing the required lateral stiff-ness. For tall building up to about fourty stories, a system of shear walls may be used to increase the stiffness of the structure.