Maciel, Daniel NelsonCavalcante, João Paulo de Barros2016-08-232016-08-232016-03-11CAVALCANTE, João Paulo de Barros. Contribuição ao estudo de treliças não lineares considerando efeitos térmicos. 2016. 39128f. Dissertação (Mestrado em Engenharia Civil) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2016.https://repositorio.ufrn.br/jspui/handle/123456789/21237This work presents the numerical analysis of nonlinear trusses summited to thermomechanical actions with Finite Element Method (FEM). The proposed formulation is so-called positional FEM and it is based on the minimum potential energy theorem written according to nodal positions, instead of displacements. The study herein presented considers the effects of geometric and material nonlinearities. Related to dynamic problems, a comparison between different time integration algorithms is performed. The formulation is extended to impact problems between trusses and rigid wall, where the nodal positions are constrained considering nullpenetration condition. In addition, it is presented a thermodynamically consistent formulation, based on the first and second law of thermodynamics and the Helmholtz free-energy for analyzing dynamic problems of truss structures with thermoelastic and thermoplastic behavior. The numerical results of the proposed formulation are compared with examples found in the literature.Acesso AbertoMétodo dos elementos finitos posicionalTermomecânicaTermoelasticidadeTermoplasticidadeIntegração temporalNão linearidademasterThesisCNPQ::ENGENHARIAS::ENGENHARIA CIVIL