Linear and non-linear analysis of space trusses subjected to wind actions and temperature variation

Resumo

The structural analysis seeks to determine the behavior of a structure when subjected to external actions
and makes it possible to obtain its responses in terms of stresses, strains, or displacements, for example. Most
engineering structures present a linear elastic behavior, however, some complex structures, such as arches and tall
buildings, may present a non-linear behavior, requiring tools that allow considering such effects to obtain more
realistic results. In this context, the present work proposes a comparative analysis between linear and non-linear
responses in space trusses through a computer program developed in Fortran language. The structure studied is a
metallic lattice dome subject to self-weight loading, wind action, and temperature variation, considering the
technical specifications of the ABNT NBR 6120:2019 and ABNT NBR 6123:1988. To describe the behavior of
the structure it was used the finite element formulation for bar element and the geometric nonlinearity due to
normal forces. The results showed that the internal forces on the bars can vary up to 850% between the analyzed
cases.