Contribuição ao projeto de pavimentos de lajes sem vigas protendidas
Resumen
Prestressed flat plate floor system has been an excellent structural solution for
building work when there is a demand for fast construction with less manpower,
where the building has height restrictions or when architecture design requires wide
environments and major deformations on the floor can be avoided. Aspects like
these, make the use of this structural system grow constantly. Although there are
cases of built constructions, some structural engineers still feel uncomfortable to use
the system, because beyond the scarcity of bibliography on this matter, most of the
problems are solved by intuition, and not with technical-cientific knowledge. This
research presents fundamental concepts for understanding the prestressed flat plate
floor system, as well the designing methods. A comparison of the tensile stress in the
slabs is also made, envolving the Equivalent Frame Method, the Finite Element
Method and the Grillage Method. The effect of the lack of alignment also is studied.
In sequence, examples of prestressed flat plate floor are shown and their structural
solutions, using adherent and non-adherent cables, using partial prestress and
reduced prestress. At the end of this research comments are made about the
obtainned results and suggestions of structural solutions are presented for specific
problems that occur frequently.