# Seismic Vulnerability Assessment of Historical Masonry Buildings in Croatian Coastal Area
In the present study, a seismic vulnerability assessment approach based on the calculation of seismic vulnerability indexes was applied to Kastel Kambelovac, a Croatian settlement located in the coastal Dalmatian area. The town consists of a historical core with stone masonry buildings built between the 15 th and 19 th centuries and more peripherical buildings built from the beginning of the 20 th century up to the present. These buildings wereerected according to different technical regulations as they date from different periods, namely, before 1948, from 1949 to 1964, from 1964 to 1982, from 1982 to 2005, and, finally, from 2005 onwards. This paper presents the development of a methodology for a seismic vulnerability assessment and its application to the stone masonry buildings in the historical core. The investigation was supported by the Interreg Italy-Croatia project \"Preventing,managing, and overcoming natural-hazards risks to mitigate economic and social impact\" (PMO-GATE) in which multi-hazard risks caused by earthquakes, floods caused by rising sea levels due to climate change, and extreme sea waves are analyzed. The seismic vulnerability method applied in this work was derived from the Italian GNDT approach, with some modifications resulting from specific aspects of the buildings and the construction materials typical of the investigated area. Instead of the field observation of the damage state caused by past earthquakes, a static non-linear pushover analysis was performed for the typical buildings at the test site. Furthermore, the yield and collapse accelerations were determined and, subsequently, new relations between damage, vulnerability, and peak ground acceleration were derived. The damage index was expressed in the 0-1 space by means of a tri-linear law defined by the yield acceleration, \(\mathrm{PGA}_{\mathrm{y}}\), which represents the beginning of the damage, and the acceleration of the collapse of the building, \(\mathrm{PGA}_{\mathrm{c}}\). Seismic vulnerability indexes for the historical masonry buildings in a typical settlement located along the Dalmatian coast were computed. These indexes were used to build a seismic vulnerability map of the area. New damage curves for the estimation of the damage to the building under specific seismic conditions were derived and the results were presented for two return periods, according to EC8. The proposed approach has some similarities with a hybrid procedure for the definition of seismic vulnerability in Mediterranean cross-border urban areas [38]. However, in that paper [38], the vulnerability curve proposed by [PERSON] and [PERSON] [23] was calibrated using the numerical results for prototype buildings that were representative of the most widespread building typologies [38]. On the contrary, the investigation presented in this study was based on the estimation of the damage state through non-linear pushover analysis of a large number of buildings, more specifically, a total of 11 buildings in the test area. Furthermore, a new damage-vulnerability-peak ground acceleration law has been derived.