Ftool 5.0: Nonlinear, stability and natural vibration analyses

Resumo

This work presents a new version of Ftool, a program for structural analysis of two-dimensional frame
models. This new version has two new analysis modes: nonlinear analysis and eigenvalue analysis. The former
currently considers geometric nonlinearity, allowing users to perform numerical simulations of structures with
large displacements and rotations, but small deformations. The latter considers two types of general eigenvalue
problem to analyze the stability and the natural vibration of structures. The stability analysis provides the critical
loads and the buckling modes of the structure while the natural vibration analysis provides the natural frequencies
and the vibration modes. Several options are available to perform these new types of analysis and to check the
results. These options are explained and exemplified throughout this paper.