PSI - Issue 44

Marco Furinghetti et al. / Procedia Structural Integrity 44 (2023) 1490–1497 Marco Furinghetti et al. / Structural Integrity Procedia 00 (2022) 000 – 000

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1. Introduction In this research work the outcomes of experimental hybrid simulations performed at the EUCENTRE Laboratory in Pavia (Italy) have been used to validate the efficiency of fast design rules for Curved Surface Slider devices (Furinghetti, 2022). Precisely, a building case study structure has been adopted as a numerical substructure, whereas a full-scale Double Curved Surface Slider Device (DCSS) has been tested within the Bearing Tester System of the Laboratory. A Special performance point has been assumed, in order to obtain similar mechanical properties of the physical tested isolator. Results have shown good agreement between the experimental responses and the target design performance, in terms of displacement demand of the isolation layer and of peak building base shear, from both the single-event and mean quantities. In addition, purely numerical non-linear time history analyses have been performed, aiming at highlighting possible discrepancies between the hybrid experimental and the numerical simulated responses. 2. Case Study Structure The case study structure consists of a 6-storey reinforced concrete frame building (Fig. 1), which has been considered as a case study structure in recent research works, and all members have been designed according to Italian Building Code (Furinghetti et al. 2020). 21m and 12m can be considered as plan dimensions for x and y directions respectively, with 3.05m of interstorey height for all the floors, but the ground level, which is characterized by 3.4m height; consequently, the total height of the building is equal to 19m.

Fig. 1. Analytical scheme of the case study structure (left) and Capacity curve of the fixed-base configuration (right)

Aiming at evaluating the effective level of seismic protection of the building, as a consequence of the response of the isolation system, the capacity curve of the fixed-base configuration of the superstructure has been computed through a non-linear static analysis (push-over), according to an OpenSees model, which considers inelastic distributed plasticity frame elements. The capacity curve has been adopted firstly for the definition of the minimum considerable design period, and then for the analysis of the effective protection level of the building, provided by the isolation system (De Luca et al. 2019, Dall’Asta et al. 2020, Tsiavos et al. 2021, O'Reilly et al. 2022).

3. Design of the isolation system In order to define the characteristics of the isolation system, special fast-design rules have been applied,