**2. Dissipation device model assembly**

The mounting principle of the dissipation system can be accomplished through attachment to the structural frames of the isolated structure. It can be seen that it can be mounted between the foundation and the superstructure of the bridge ensuring a disconnection between the two structural elements. Therefore, the earthquake-induced efforts at the foundation level cannot be fully transmitted to the superstructure because they are consumed by the composed dissipation system. Figure 1 shows the mounting principle and mathematical model of isolation system at the bridge structure.

**Figure 1.** Composed isolation system mathematical model [1, 2].

The equation of motion with rolling system can be written as:

$$m\_{\mathbf{i}}\ddot{\mathbf{x}}\_1 + F\_r \text{sign}(\dot{\mathbf{x}}\_1) = -m\_{\mathbf{i}}\ddot{\mathbf{x}}\_3 \tag{1}$$

where *Fr* is the restoring force.

are subjected, the design engineers must consider the use of resistant materials and appropriate dimensioning of the resistance structure. In addition to these methods, special protective systems are being used that can provide structure isolation against destructive dynamic actions. Such systems are successfully used for the endowment of bridges and viaducts worldwide. These protective systems are mechanical systems capable of assuming some of the earthquake energy aiming to dissipate and transform it into another form of energy. Usually, the mounting solution for the dissipating energy devices is interposed between the structural frames of the bridge or viaducts. Therefore, the total energy of the earthquake is not reaching the superstructure being consumed at the isolation system level. An experimental model of the hybrid isolation system is described in this paper. This model consists of a rolling pendu‐ lum system combined with an elastomeric system. The idea of building such a system was to achieve the combined effects of the two systems types represented by rolling dissipative system and elastomeric system. This system has been experimentally tested on a reduced scale

Proceedings of the International Conference on Interdisciplinary Studies (ICIS 2016) - Interdisciplinarity and Creativity

The mounting principle of the dissipation system can be accomplished through attachment to the structural frames of the isolated structure. It can be seen that it can be mounted between the foundation and the superstructure of the bridge ensuring a disconnection between the two structural elements. Therefore, the earthquake-induced efforts at the foundation level cannot be fully transmitted to the superstructure because they are consumed by the composed dissipation system. Figure 1 shows the mounting principle and mathematical model of

structure and the results are shown in the following.

**2. Dissipation device model assembly**

in the Knowledge Society

112

isolation system at the bridge structure.

**Figure 1.** Composed isolation system mathematical model [1, 2].

Also, the addition of elastomeric systems determines the following equations of motion:

$$\begin{cases} m\ddot{z}\_3 + c\_z \dot{z}\_3 + k\_z z\_3 = 0\\ m\ddot{x}\_3 + c\_x \dot{x}\_3 + k\_x x\_3 = 0 \end{cases} \tag{2}$$
