Induced Seismic-Site Effects on the Vulnerability Assessment of a Historical Centre in the Molise Region of Italy: Analysis Method and Real Behaviour Calibration Based on 2002 Earthquake

Abstract

The present research aims to estimate the influence of site amplification on the seismic vulnerability of the historical centre of the municipality of Baranello in the Molise Region of Italy. Firstly, a structural and typological characterization of the investigated area has been done according to the EMS-98 scale. Subsequently, the vulnerability assessment of the historical buildings located there has been carried out through an appropriate survey form in order to identify the buildings which are most susceptible to seismic damage. To this purpose, the seismic event occurring in October of 2002 has been selected as a reference earthquake. Moreover, according to the AeDES form implemented by the Italian Civil Protection Department to evaluate the usability of constructions after seismic events, the calibration of the typological vulnerability curves of the built-up area has been done, and a quantitative assessment of the local seismic response has been achieved, based on the seismic motions recorded after the 2002 Molise earthquake. Finally, the local amplification factor, which negatively influences the severity of the seismic damage on the structures, has been taken into account in order to more correctly foresee the expected damage of the inspected urban sector, so as to use more appropriately the achieved results for reliable seismic risk mitigation plans.

Effects of the Mortar Matrix on the Flexural Capacity of Masonry Cross Sections Strengthened with FRCM Materials

“…Nowadays, the use of composites for strengthening intervention and structural rehabilitation of existing masonry buildings is of paramount importance. The last seismic events in Italy, such as L'Aquila (2009), Emilia Romagna (2012), Central Italy (2016), and Ischia (2017), have confirmed the high vulnerability of masonry structures [1][2][3]. This is a crucial point for the Italian regions, where the masonry buildings represent the large part of the existing stock (i.e., churches, historic monuments, residential buildings).…”

Influence of Local Site Effects on the Typological Fragility Curves for Class-Oriented Masonry Buildings in Aggregate Condition

“…In the examined specific context, the CARTIS form has been used in order to detect the prevalent ordinary building typologies in the historical centre of Baranello. The CARTIS form has been conceived by the PLINIVS research centre of the University of Naples "Federico II" in collaboration with the Italian Civil Protection Department (DPC) during the ReLUIS 2014-2016 project "Development of a systematic methodology for the assessment of exposure on a territorial scale based on the typological/structural characteristics of buildings" [12,19].…”

“…This tool represents an important support for the scientific community since it collects and catalogues all the data, surveyed through the AeDES form, about both structural damages and main characteristics of inspected buildings detected after last past earthquakes (Friuli 1976, Irpinia 1980, Abruzzo 1984, Umbria and Marche 1997, Pollino 1998, Molise and Puglia 2002, Emilia-Romagna 2003, L'Aquila 2009and Emilia-Romagna 2012. Thus, for the quantification of the observed damage, using the Da.D.O database and exploiting the information collected in the linked AeDES form, the Damage Probability Matrices (DPM) have been statistically processed using the binomial distribution function according to the following equation [12,22]:…”

“…Afterwards, based on the examined typological classification of the surveyed buildings, a typological correlation has been conducted among CARTIS, Da.D.O and EMS-98 in order to differentiate the prevalent typological vulnerability classes [12] based on the vertical bearing structure. The attribution of a vulnerability class takes place by means of acronyms identifying the materials characterizing the vertical structure.…”

“…For an exhaustive and immediate representation of the damage, the DPM have been developed according to the EMS-98 scale in order to have a specific correlation between the mean damage grade, µ D , and the probability to achieve a given damage threshold, D K (Fig. 12) [12,29]. The results have shown that for M w = 4 about 61% of the building suffers damage D2, while for M w = 6, damage thresholds D4 (near-collapse) and D5 (collapse) are attained in 68% and 25% of the cases, respectively.…”