1,721,181 research outputs found
Nonlinear Analysis of Heart Rate Variability to Monitor Fetal Stress During Fetal Cardiac Surgery
No full textProcedura automatica per lo studio dei segnali registrati da una stazione tiltmetrica
No full textLa Tiltmetria costituisce un metodo di misura in continuo della deformazione del suolo attraverso il
monitoraggio delle variazioni di inclinazione nel tempo sia in ampiezza che in direzione ed è particolarmente
utilizzata nelle aree vulcaniche e sismogenetiche attive [Wyatt et al., 1988; Ricco et al., 1991; Ricco et al.,
2000; Ricco et al., 2003; Ricco et al., 2007].
La rete tiltmetrica gestita dalla Sezione Osservatorio Vesuviano dell’ INGV è composta da 7 stazioni
in registrazione continua ai Campi Flegrei, 5 delle quali (DMA, DMB, DMC, BAI ed OLB) sono
equipaggiate con sensori di superficie e 2 (OLB e TOI) anche con sensori borehole; al Vesuvio invece
esistono 2 stazioni con sensori di superficie (OVO e CMD) (fig. 1) [Aquino et al., 2006].INGV Istituto Nazionale di Geofisica e VulcanologiaPublished1.3. TTC - Sorveglianza geodetica delle aree vulcaniche attiveope
Procedura automatica per lo studio dei segnali registrati da una stazione tiltmetrica
No full textLa Tiltmetria costituisce un metodo di misura in continuo della deformazione del suolo attraverso il
monitoraggio delle variazioni di inclinazione nel tempo sia in ampiezza che in direzione ed è particolarmente
utilizzata nelle aree vulcaniche e sismogenetiche attive [Wyatt et al., 1988; Ricco et al., 1991; Ricco et al.,
2000; Ricco et al., 2003; Ricco et al., 2007].
La rete tiltmetrica gestita dalla Sezione Osservatorio Vesuviano dell’ INGV è composta da 7 stazioni
in registrazione continua ai Campi Flegrei, 5 delle quali (DMA, DMB, DMC, BAI ed OLB) sono
equipaggiate con sensori di superficie e 2 (OLB e TOI) anche con sensori borehole; al Vesuvio invece
esistono 2 stazioni con sensori di superficie (OVO e CMD) (fig. 1) [Aquino et al., 2006].INGV Istituto Nazionale di Geofisica e VulcanologiaPublished1.3. TTC - Sorveglianza geodetica delle aree vulcaniche attiveope
Vascular tissue engineering of small-diameter blood vessels: reviewing the electrospinning approach
No full textFragility curves derivation for masonry buildings damaged after 2009 L'Aquila earthquake accounting for the effect of construction age
No full textThe aim of this study is the analysis of seismic fragility of residential masonry buildings, with particular emphasis to the evolution of seismic behaviour over the years. To this purpose, a detailed and comprehensive taxonomy has been established, considering a restricted selection of building's features, avoiding the ineffective fragmentation of the database. The fragility assessment has been performed based on the data collected after the L'Aquila 2009 earthquake and made available by the Italian Department of Civil Protection through the online platform Da.D.O. (Database of Observed Damage). The database has undergone a refinement process to guarantee the completeness of the information, avoiding possible bias in the subsequent fitting procedure for fragility analysis. Thus, PGA (peak ground acceleration) from the ShakeMap has been used for ground motion characterization and 5 + 1 damage levels defined according to the European Macroseismic Scale have been considered for damage classification. Different regression models have been adopted to determine the parameters of lognormal fragility curves, measuring their goodness of fit with the observed damage probability matrices.
Starting from the unconstrained model, further regression constraints (i.e., a common value for logarithmic standard deviation and the respect of the hierarchy of median PGA with the construction age) have been introduced, thus leading to the definition of the constrained model. The benefits in the introduction of further regression constraints are counterposed to the effectiveness of constrained curves to model observational data through the comparison of the goodness of fit between the unconstrained and constrained models
A component-level methodology to evaluate the seismic repair costs of infills and services for Italian RC buildings
Full text linkThe reliable estimation of seismic losses due to damage to buildings is paramount for the post-emergency management and the planning of recovery activities. For residential reinforced concrete (RC) infilled buildings, a significant role in the computation of seismic loss is played by non-structural components, above all infills, partitions and services, as shown in past earthquakes. In this work, a component-based methodology is proposed to assess seismic losses for residential RC buildings in Mediterranean region. The attention is focused on the repairing activities for masonry infills (typical enclosure or partitions elements in Italian and Mediterranean RC buildings), and for services (plumbing systems, electric equipment, floor/wall tiles...), commonly enclosed within the infill panels for the considered building typology. The described methodology can be used starting from the expected damage level to infills and partitions. It adopts given repair unit costs at different damage states of infills. The loss estimation methodology has been, first, validated by comparing predicted and actual repair costs for specific case-study buildings damaged by L’Aquila (Italy) 2009 earthquake. Then, the methodology has been applied to a wide dataset of RC buildings (about 2500 residential buildings) damaged by L’Aquila earthquake available from the literature, to show its possible application at a large-scale level. A good agreement between observed and predicted costs is obtained both for specific case-study buildings and for the wider building stock, especially when damage to structural components is very limited
Repair costs due to infills for RC buildings after 2009 L'Aquila earthquake
No full textAmong natural hazards, earthquakes are certainly paramount due to the lack of possibility to predict their occurrence, and due to their impact on civil structures in terms of social consequences, direct monetary losses, loss in functionality, and risk of casualties. The analysis of damage data in literature highlights the key role played by damage to non-structural components, namely, infills and partitions, in Reinforced Concrete (RC) Moment Resisting Frames (MRF). Therefore, the use of simplified methods leading to the definition of repair costs, fatalties, and repair time due to earthquake, reproducing the influence of infills on the global behaviour of RC frames, is very attractive for insurance and risk management strategies. Among them, recent proposals allow determining damage and losses to individual structural and non-structural components by using fragility and consequence functions. In present work, a simplified mechanical method - PushOver on Shear Type models (POST) - for seismic vulnerability assessment of infilled RC buildings is used to determine repair costs of a dataset of lightly damaged residential buildings subjected to the April 6th, 2009 L'Aquila earthquake. To this end, the inter-story drift ratio (IDR) capacity at given damage states (DSs) and the cost functions reported in the most recent literature for infill panels are used to determine repair costs, starting from the nonlinear response history analyses of buildings evaluated according to POST methodology. The considered database is constituted by Moment Resisting Frame (MRF) residential RC buildings located in the Abruzzi region that after the 2009 earthquake have been charged to post-earthquake usability assessment procedure and characterized exclusively by damage to infill panels. In such a way, the evaluation of repair costs can be made by neglecting the contribution due to repair activity to other structural components (namely vertical structures, horizontal structures, stairs, roofs)
Influence of construction age on seismic vulnerability of masonry buildings damaged after 2009 L'Aquila earthquake
No full textThe aim of this study is to describe the evolution of vulnerability over the years for masonry buildings characterized by a good quality layout and/or a regular texture. To this aim, data collected shortly afterwards the L'Aquila 2009 earthquake are considered, recently released by the Italian Department of Civil Protection (DPC) through the Da.D.O. (Database di Danno Osservato, Database of Observed Damage) platform (Dolce et al., 2019) [1]. The taxonomy has been defined reflecting the need to consider all the parameters available from post-earthquake inspections and the obtainment of reliable and homogeneous sample. A time-consuming data processing has been performed to obtain a generalized version of the original database, which has been integrated with census data to avoid bias in vulnerability analysis. Then, damage analysis has been done considering 5 + 1 damage grades defined for the whole building based on the conversion of damage for vertical structures in sight of the classification of European Macroseismic Scale. The analysis of mean damage values reveals the general trends as a function of the main influential parameters, i.e. construction age and horizontal structural types, having fixed the vertical structural type and the quality layout. Vulnerability curves were derived assuming a lognormal statistical model and peak ground acceleration as intensity measure, through a minimization procedure of the distance between predicted and observed mean damage. In addition, the general criteria established to define the taxonomy had allowed to accomplish a direct comparison also between vertical structures, namely buildings with good quality and regular texture analysed herein and those with bad quality and irregular layout thoroughly analysed in Del Gaudio et al. (2021) [2]; fully characterizing the behaviour of masonry buildings under lateral loads
- …
