Análise dinâmica não linear de estruturas laminadas compósitas considerando o fenômeno da explosão

Abstract

Explosions are an event of rare occurrence in civil engineering structures, however its materialization and non-prediction in design of civil projects can generate a catastrophic effect. At the same time, new structural technologies are developed to be more resistant and the possibility to combine materials using layers allows the applicability of this type of structure to explosive loads, as observed in the literature. In this way, the aim of this thesis is to verify the dynamic response of laminated plates and investigate the validity of the simplification of the design model for laminated beams. Furthermore, another objective of this research is to present a methodology for determining the characteristic equation for determining the maximum displacements of any orthotropic laminated plate, simply supported, considering its thickness and the parameters of explosion, based on parametric analyses. Finally, to make the parametric analyses possible, a simple and fast processing software was developed using MATLAB R2021a. The dynamic analysis results present an excellent congruence between the examples in the literature and the software developed. Moreover, the contribution of the negative phase in an explosion and its comparison with the use of only the positive phase, showed relevant differences in maximum displacements. Using the software developed, parametric analyses were realized and the characteristic equation for each structure was obtained. Finally, the simplification of plate structures into beam structures, in dynamic analysis of explosive loading, was presented with satisfactory approximation results in amplitudes, but inconsistent in frequencies.