Análise vibratória de fundações de máquinas sobre estacas.

Abstract

The foundation analysis by dynamic solicitations is always present in industrial projects. It is an area which is poorly explored in geotechnical engineering and there are few information about this subject in Brazil, in general. The most common method to realize this analysis consists in simplifies structural models by using springs. It is known that these reaction coefficients have a large range of variation and this project s focus can, in some cases, be against the safety side or lead to unnecessary over designs. This proves the necessity to do a more criterious evaluation by using the interaction soil x structure where the springs usually used in common vibration analysis are replaced by the real stiffness of soil when designed as a continuous medium through its discretization by finite element method. This present dissertation analyzes the problem through the dynamic modulus of the software PLAXIS 2D. In this sort of analysis, besides the modeling of soil as a continuous medium, it becomes possible to introduce specific boundary conditions associated to the studied problem, multiple soil layer, that can be horizontals or inclined, in addition to the introduction of dampers able to avoid the spurious reflection of incident waves on the boundary of finite element mesh and then to model more efficiently the energy loss by radiation. This present dissertation compares experimental measurements and efficient solutions of classical vibration methods with the response obtained by FEM, showing results quite satisfactory both by classical methods and by FEM.