The techniques of structure analysis of tall buildings are evolving rapidly, as is research in other fields of knowledge, due to the fast development of computers. Thus, many projects have been carried out, each with its peculiarities and considerations, to constantly improve this type of calculus. As a result, more economical and efficient structures derive from the attempt to represent more precisely the actual behaviour of tridimensional structures of tall buildings. Within this context, this work examines the behaviour of tridimensional structures of tall buildings subject to vertical and lateral forces, considering the bending stiffness of slabs. BEZERRA carried out a similar work, but for columns in first order theory. The finite element adopted in floor discretization, responsible for the consideration of contribution of bending stiffness of slabs in the analysis of the building, is the DKT (Discrete Kirchhoff Theory). The techniques of serial and parallel substructuring are applied to the global stiffness matrix for the calculus of the forces and displacements in the structure. A computer program was developed for the calculation process employed, using the computer language Fortran Power Station 90 and pre- and post-processors in Visual Basic 4.0 for a Windows environment.

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