The restricted influence of kinematic hardening on shakedown loads (original) (raw)
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The restricted influence of kinematic hardening on shakedown loads pdfauthor
2004
Structural design analyses are conducted with the aim of verifying the exclusion of ratcheting. To this end it is important to make a clear distinction between the shakedown range and the ratchetting range. In cyclic plasticity more sophisticated hardening models have been suggested in order to model the strain evolution observed in ratchetting experiments. The hardening models used in shakedown analysis are comparatively simple. It is shown that shakedown analysis can make quite stable predictions of admissible load ranges despite the simplicity of the underlying hardening models. A linear and a nonlinear kinematic hardening model of two-surface plasticity are compared in material shakedown analysis. Both give identical or similar shakedown ranges. Structural shakedown analyses show that the loading may have a more pronounced effect than the hardening model. M. Staat, M. Heitzer
Shake table tests on prestressed concrete frames
Materials and Structures, 1998
Results from small scale models of prestressed concrete frames, tested by a shake table simulating earthquake forces are presented. The primary curves (horizontal force-displacement relationships) and the hysteretic loops are determined experimentally. Concrete strength is approximately between 32 and 84 MPa, and two types of effective prestresses are used, namely, 40 and 80 percent of the yielding stress of the prestressing bars. It is found that the effects of concrete strength and effective prestress on the ductility are significant because the ductility increases with increasing concrete strength and with decreasing effective prestress, and the prestressed concrete flames may have at least a ductility factor of 8.0. table vibrante capable de simuler les forces d' un tremblement de terre, sont pr&en-t& ci-apr&. Les courbes primaires (relations force-d~placements horizontales) ainsi que les boudes d'hyst&&is sont alors d~termi-n&s d'une mani&e expMmentale. La re'sistance du b~ton se situe approximativement entre 32 et 84 MPa, et deux types de pr&ontraintes effectives sont utilis&, a
Mechanics Research Communications, 2009
In this paper, shakedown analysis for plasticity models with hardening is considered by using the framework of implicit standard materials. It is shown that the concept of bipotential allows not only to retrieve some classical results in associated plasticity but also to consider non-associated laws e.g. the non-linear kinematic hardening rule. Furthermore, the comparison of the shakedown load for the three kinds of hardening on an example shows substantial differences and thus the importance of considering the non-linear kinematic hardening in shakedown analysis.
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