PSI - Issue 44

Francesco Morelli et al. / Procedia Structural Integrity 44 (2023) 574–581 Francesco Morelli, Agnese Natali, Gabriele Poggi / Structural Integrity Procedia 00 (2022) 000–000

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with very small stiffness values; in such way the column does not attract significant bending moments, see Fig. 6. A damping ratio of 5%, which is a typical value for hybrid concrete-steel buildings, is assigned to the first two modes of the structure. The damping matrix is assumed to be proportional to the mass matrix and to the tangent stiffness matrix.

Fig. 4. Fiber model of RC Wall.

Fig. 5. Scheme of the HCSW finite element model.

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Fig. 6. (a) Global view of the FE model; (b) details of the connections among elements.

3. Insight in the dynamic behavior of the HCSWs The seismic performance and the dynamic behavior of the HCSW system was investigated using a multi-record nonlinear incremental dynamic analysis (IDA). The analyses were performed using as seismic input a set of 30 natural ground motion records from the European Strong motion Database, which are scaled to match, on average,