Optimum Design of a New Hysteretic Dissipater - Design Optimization of Active and Passive Structural Control Systems - page 291

Figure 16. Collapse of the welding of the 20 kN dissipater after the first characterization tests

Figure 17. Configuration at the end of the test: a) out-of-plane instability of the dissipater, b) permanent
deformation in the dissipaters with lateral reinforcement

lateral force reached in the non-linear part. It is
certainly possible to identify the causes to justify
this large discrepancy. The first is intrinsic to the
test mode and should be attributed to the recovery
of existing clearance throughout the test system,
as well as the deformability of the frame used to
load the devices. The second, instead, is to be

attributed to the simplification introduced in the
model and not necessarily realized in the real
panel. This simplification consists in considering
the existence of a perfect solidarity between the
steel and aluminum plates that make up the
panel. In reality the load transfer between these
plates is ensured by the friction forces and the