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Figure 24. Model of the steel frame floor: a) acceleration measurements; b) kinematic model
signal input corresponding to S2-000196xa earth-
quake scaled at 50%.
It can be observed that the two panels have a
different behaviour. In particular, the West panel,
corresponding to Figure 25a, seems to have been
interested by an excessively limited shear load.
For this panel the hysteresis cycle is practically
absent. The behaviour of the East panel is differ-
ent. In fact, the acceleration that interested this
panel, and subsequently the correspondent shear
load, has been relevant and a hysteresis cycle
appeared, confirming the possibility of the device
to dissipate seismic energy. This aspect regarding
the two hysteresis cycles has been confirmed by
the data obtained from all the other seismic tests
that have been carried out. However, it is notice-
able that the differences existing in the two hys-
teresis cycles, very limited in the initial tests that
have been performed at a very low seismic inten-
sity, become more important at higher seismic
levels. Moreover, at the end of the test program,
it has been observed that the West panel pre-
sented a crack failure of the welding that joined
the panel to the horizontal base plate, while this
failure was absent in other panels. Therefore, it
is possible that the results obtained for the West
panel of the first floor could be largely influenced
by a welding defect that caused its premature
failure. Probably this failure appeared since the
initial tests at a lower intensity. Therefore, this
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