Sobre os parâmetros de instabilidade global e relações entre o Alfa e o Gama-Z

Abstract

The pattern of of building construction has changed over the last few years, tending to increasingly slender constructions. It is known that this typo od builfing is more subject to the effects of seconde order, thus, the analysis of these effects should be invés tigated with great caution by structutal calculators. In view of the complexity of this type of analysis,the parameters of global instability are presented as an alternative for simplified verification of the dismissal of second-order global efforts. Of theses parameters, this work will discuss the Gama-Z in more depth in order ro formulate new equations that realte in to Alfa parameter. To reach this objective, equations of the second and third degree were obtained for the variations of the Fck, characteristic strenght of concrete to compression, anda of the equivalente reduction coefficiente for the simulation of the physical non-linearity of the behavior of the constituente material of the struture.