Nonlinear analysis of plane frames.
Bradshaw, Joel Clinton
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The results obtained from the nonlinearly elastic, geometrically linear beam-column are almost identical to the results obtained by the method of Gurfinkel and Robinson  within the linear range of the stress-strain curve. When the displacements become large, the Gurfinkel and Robinson routine tends to give higher estimates of the strain state of the section being analysed as compared to the results via the finite element model. Changing the number of integration points seems to have a stronger effect on the results than refining the mesh.
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