Stochastic response of large FEM models with hysteretic behaviour in beam elements

摘要

An investigation of the hysteretic response of 3D frames in FE-systems with a high number of DOF under random dynamic load is presented. In stochastic analysis it is of high priority to provide a system of equations with a small number of unknowns. Working in a reduced modal base the contribution of the neglected higher modes is replaced by plastic shape functions. These shape functions are generated by a mechanical consideration of the local plastification effects. The application of the different solution techniques on two large frame structures is discussed in the context of hysteretic moment-curvature relations of 2D and 3D flexible beams. The results are commented reflecting the accuracy and performance of the methods.