Abstract
A computer program for the simulation of the behaviour of steel and composite structures under monotonous and nonmonotonous time dependant loading is presented. The material properties are modelled from tests (parabolic stress-strain curve for the concrete in compression, bilinear stress-strain relationship including the tension stiffness for the strain of the reinforcing steel and a bilinear stress-strain relationship taking account of the strain hardening and the Bauschinger effect for the structural steel). The program using the Newmark-Timesteps-Method allows to calculate composite structures and mixed structures under seismic loading. The degradation of the structural stiffness depending on the load history is allowed for. This program was used to interpret the experimental results and to determine the basic parameters that control the structural behaviour. The test evidences could be extrapolated to frames so far not tested, in order to check the influences of parameters in view of the development of code rules (e.g. Eurocode 8 /1/).
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