Analysis of two-dimensional frame structures based on first and second order plastic theory using the displacement method with system changes
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Dipl.-Ing. Peter Osterrieder and Professor Dr.-Ing. Ekkehard Ramm
For the analysis of two-dimensional, unbraced systems using second order plastic theory two methods expanding on approaches used in the elastic range are offered:
a) combined force and displacement method (M-ϑ method),
b) displacement method.