Osservatorio sismico delle strutture: the Italian structural seismic monitoring network

Abstract

The OSS (acronym of the Italian name “Osservatorio Sismico delle Strutture”) is a network of permanent seismic monitoring systems installed in public buildings, and also in some bridges and a dam. Each system consists of a number of sensors sufficient to completely describe the dynamic behaviour of the structure. Structural typologies have been selected according to their representativeness of the public building stock and to their importance for the emergency management. Some relevant aspects are addressed, including: (i) a brief description of the network, (ii) a résumé of data usually collected and organized for each structure (structural survey and in situ tests on materials, experimental modal analysis, FEM models and structural identification) and (iii) a description of data management tools and procedures (network operation performance, post-earthquake automatic analysis, public access to data). At the end, on-going and future use of OSS data is briefly discussed, with reference to statistical analysis of relevant parameters of the available records, real-time post-earthquake damage assessment and an in-field reconnaissance visit after a recent earthquake. © 2015, Springer Science+Business Media Dordrecht

Use of Spectral Entropy for Damage Detection in Masonry Buildings in the Presence of Mild Seismicity

“…The OSS, is a nationwide network founded by the Italian Dipartimento della Protezione Civile (DPC) in the 1990s. The aim of the OSS network is to monitor various strategic Italian buildings, such as bridges, schools, hospitals and city halls [10].…”

Amplitude dependence of equivalent modal parameters in monitored buildings during earthquake swarms

“…As it is possible to notice in Figure 9, and confirmed by an average correlation coefficient of À0.86 for all the modes, in this case, the logarithmic regression lines almost perfectly match the identified frequency data, especially for the bell-tower flexural modes. Previous experiences [2] might explain these results as the effect of a possible damage mechanism of the nave associated with this mode, e.g. It is worth noting that the fourth mode varies of 46.5% with amplitude, whereas the other modes vary of less than 30%.…”

“…Because, according to OSS surveys [2], none of the building was seriously damaged by the seismic swarm, the prevalent cause leading to the variation of modal properties has to be the interaction between the structure and the soil-foundation systems. In fact, similar trends and regression coefficients were obtained even if the first building is founded on clay and the latter on sandstone.…”

“…The Seismic Observatory for Structures (OSS), founded at the end of the 1990s by the Italian Department of Civil Protection (DPC), is a nation-wide network for the permanent monitoring of the seismic response of more than 100 strategic public buildings in Italy [1,2]. The Seismic Observatory for Structures (OSS), founded at the end of the 1990s by the Italian Department of Civil Protection (DPC), is a nation-wide network for the permanent monitoring of the seismic response of more than 100 strategic public buildings in Italy [1,2].…”

System Identification of Tunnel Response to Ground Motion Considering a Simplified Model

“…However, deployment of SHMS in tunnels has not been as widespread as for other infrastructure assets, such as bridges and buildings (Fraser et al, 2010;Dolce et al, 2017), mainly due to the lack of a standardized approach resulting from the special nature of each project and the harsh environment faced by sensors (Bhalla et al, 2005). Fortunately, such issues have recently been addressed (Bennett et al, 2010;Tondini et al, 2015;Li et al, 2016) resulting to an increase in their deployment (Dikmen, 2016;Wang et al, 2017).…”