GNGTS 2019 - Atti del 38° Convegno Nazionale

526 GNGTS 2019 S essione 2.3 type of Groningen reinforced concrete structural systems for which experimental or numerical seismic response data was not available. Details on such activities, which were beyond the scope of this manuscript, can be found in Brunesi et al. (2018). In order to design the tests, in particular for the shake table ones, seismological information is essential to apply time histories representing those that might hit the building stock to be assessed. Particular attention was paid to the selection of the most appropriate input motions, not only in terms of spectral shape but also taking into account other intensity measures specific of earthquakes induced by this gas field (i.e. peak ground velocity and significant duration). Furthermore, data on building typology, mechanical properties and detailing were necessary to set up the most appropriate tests on component and structures, in order to take advantage of the tested seismic response of structures similar to those of the building stock and subjected to motions compatible with those that could potentially hit the region. On the other hand, the test campaign served as input for the calibration of exposure model, fragility functions and consequence model. All the data collected and elaborated from the laboratory tests constituted a reliable reference for the calibration of numerical models simulating the static and dynamic behaviour of structures or part of them (e.g. Kallioras et al. 2019, Avanes et al. 2018, Malomo et al. 2019, see Fig.3). Particular attention was focused on the testing and subsequent simulations of collapse of structures to develop the consequence model; shaking-table collapse tests were performed at LNEC laboratory on full-scale buildings and at EUCENTRE on specific structural components. The material and geometrical properties of the reference building numerical models were extended to be compatible with the exposure model, that was developed taking into account the results of the in-situ material testing performed on the building stock, Dutch masons built the structures. Table 1 reports an up-to-date brief summary of the complete experimental campaign started in 2014. Conclusions. This brief summary paper describes the methodology adopted to support the assessment of the seismic vulnerability of unreinforced masonry buildings in the Groningen province in the Netherlands by means of a comprehensive testing programme. In-situ tests on different masonry typologies common in the building stock of the region provided useful information to characterize the mechanical properties and their variability, Fig. 2 - Pictures of the 6 full-scale buildings tested on shaking table.