In this work, a brief summary of the integrated design of the structural and the viscoelastic bracing-damper systems is presented.

Then a validation of the integrated procedure is performed by verifying that an optimal single-degree-of-freedom integrated system achieves in average the expected performance displacement by considering a set of seven unscaled acceleration records.

In fact, the study is carried out on a single-degree-of-freedom integrated system by means of dynamic analyses by selecting from the European database a set of seven historical unscaled accelerometric recordings compatible in average with the elastic spectrum (with viscous damping ratio equal to 5%) relative to the ultimate limit state ULS, life safe, provided by the new Italian seismic code NTC08 (NTC 2008) and considering an ordinary structure on soil type A with a nominal life of 50 years (which corresponds to design for a 475 years return period according to the code) located in Sant’Angelo dei Lombardi (in Southern Italy).

Finally the extension of this procedure to a proportionally damped multi-degrees-of-freedom integrated system, having both uniform that non uniform stiffness distribution in elevation, is developed on the basis of specific hypotheses by evaluating the different energy rates and the average displacement of the time history responses to the seven unscaled acceleration records and highlighting the effectiveness of the proposed integrated design methodology.