FIGURE 35.10 Energy response of test structure: (a) without passive devices and (b) with passive devices (Lobo et al. 1993).

N21E earthquake signal normalized for peak ground accelerations of 0.20g. A considerable portion of the input energy is dissipated via hysteretic mechanisms, which tend to damage the primary structure through cracking and the formation of plastic hinges. On the other hand, damage is minimal with the addition of a set of viscoelastic braced dampers. The energy response of the braced structure, due to the same seismic signal, is shown in Figure 35.10b. Notice that although the input energy has increased slightly, the dampers consume a significant portion of the total, thus protecting the primary structure.

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