Peres, NunoGonçalves, RodrigoCamotim, Dinar2017-06-262017-06-262016-11-09Peres, N., Gonçalves, R., Camotim, D., “First order Generalized Beam Theory for curved members with circular axis”, Proceedings of the International Specialty Conference on Cold-Formed Steel Structures (Baltimore, EUA, 9-10 novembro), LaBoube R.,Yu W. (Eds.), pp. 1-15, 2016.http://hdl.handle.net/10362/21688This paper presents a first-order Generalized Beam Theory (GBT) formulation for thin-walled members with circular axis and undergoing complex global-distortional-local deformation. The fundamental equations are derived on the basis of the usual GBT kinematic assumptions (Kirchhoff, Vlasov and wall in-plane inextensibility), leading to a formulation able to retrieve accurate solutions with only a few cross-section deformation modes (cross-section DOFs). It is shown that the classic Winkler and Vlasov theories can be recovered from the derived formulation. A GBT-based finite element is use to analyze numerical examples illustrating the application and potential of the proposed formulation.engjournal article