Search results for "HQ"
showing 10 items of 276 documents
Seismic behavior of exterior RC beam-column joints without code-specified ties in the joint core
2021
Abstract Beam-column joint design for reinforced concrete (RC) buildings is a critical issue for modern earthquake engineering, because for these structural elements, the current codes provide several geometrical constraints and reinforcement provisions, which may be very complex to implement during the construction phase. To investigate how a construction error might influence the joint behavior, two identical full-scale exterior beam-column joints specimens are built, according to Italian Building Code specifications for the high ductility class, but without the required horizontal ties inside the joint panel. This construction error could be plausible because, according to the design dra…
Probabilistic Forecast for Northern New Zealand Seismic Process Based on a Forward Predictive Kernel Estimator
2011
In seismology predictive properties of the estimated intensity function are often pursued. For this purpose, we propose an estimation procedure in time, longitude, latitude and depth domains, based on the subsequent increments of likelihood obtained adding an observation one at a time. On the basis of this estimation approach a forecast of earthquakes of a given area of Northern New Zealand is provided, assuming that future earthquakes activity may be based on the smoothing of past earthquakes.
Waveforms clustering and single-station location of microearthquake multiplets recorded in the northern Sicilian offshore region
2013
In 2009 December, the OBSLab-INGV (Istituto Nazionale di Geofisica e Vulcanologia) deployed an Ocean Bottom Seismometer with Hydrophone (OBS/H) near the epicentral area of the main shock of the Palermo seismic sequence of 2002. The monitoring activity had a total duration of about 8 months. During this experiment, the OBS/H recorded 247 very local microearthquakes, whose local magnitude is between -0.5 and 2.5 and TS - TP delay time between 0.2 and 5 s, almost all ofwhichwere undetected by the Italian National Seismic Network. This local microseismicity has been analysed using an innovative clustering technique that exploits the similarity between the waveforms generated by different events…
Le città della Valle del Belice in Sicilia a cinquant’anni dal terremoto
2018
In seguito al drammatico terremoto che nel 1968 devastò 14 comuni della Valle del Belice, fu avviata una complessa macchina della ricostruzione, in cui le scelte non furono dettate da linee programmatiche omogenee ed univoche, determinando in alcuni casi la ricostruzione in situ dei centri distrutti, in altri il trasferimento in aree anche distanti dall’insediamento originario. La ricostruzione fu occasione per la comunità scientifica e professionale nazionale per sperimentare soluzioni progettuali che però, il più delle volte, non hanno tenuto conto della tradizione insediativa, tradendone le radici identitarie. Following the dramatic earthquake that devastated 14 municipalities in the Bel…
Rebuilding a Cultural Legacy in a New Town. Reshape Physical and Cultural Continuity between Old and New Town of Gibellina
2019
In one night the town of Gibellina was destroyed by the earthquake that hit the Belice Valley in January 1968. Enthusiastically embracing the urban theories/utopias that were on trend in the 1960s, with, however, excessive and not realistic confidence, the city was rebuilt from scratch in another site. The building of infrastructures, houses and services, albeit by means of goods conceived for a city meant to be a symbol of modernity, does not have be interpreted as a weay to donate life to a whole community. It was also necessary, indeed, to take into account issue like memory, the sense of belonging, the continuity of traditions: it became necessary to construct a new identity. Therefore,…
Rebuilding a Cultural Legacy in a New Town. Reshape Physical and Cultural Continuity between Old and New Town of Gibellina
2019
The article analyses the emblematic case of the post-earthquake reconstruction of the city of Gibellina. In the present case, the reconstruction process has led to serious errors caused by numerous wrong choices; most of these derive from the fact that the cultural heritage expressed by the places and the population was not taken into consideration. To restore the threads of memory broken by the earthquake, a research was carried out – by the writer – aimed at the reconstruction of the image of the old Gibellina; the old city, definitively erased from the ground, has been recomposed through the interpretation of the cadastral and statistical data and literary, iconographic, cartographic and…
A multidisciplinary approach to the evaluation of the mechanism that triggered the Cerda landslide (Sicily, Italy).
2005
Abstract The present paper describes a multidisciplinary approach to the evaluation of a seismically triggered landslide that occurred in the Cerda area (Italy) on September 6, 2002, about 1 h after an earthquake took place in the south Tyrrhenian Sea. The study was focused on an analysis of the role of the seismic input in triggering the landslide, in view of the evidence that no other mass movement was recorded in the adjacent areas despite geological and geomorphological spatial homogeneity. The studied area is located on a slope of the western flank of the Fiume Imera Settentrionale (Northern Sicily), which is made up of clayey–arenitic rocks. The slope inclines gently but is not unifor…
Avisos y relaciones manuscritos y impresos sobre catastrofes naturales y sucesos prodigiosos en Sicilia durante el siglo XVIII
2021
In the eighteenth century there is a large number of stories, both handwritten and in print, that describe extraordinary and unlucky events of different kinds: monstrosities, eclipses, or storms, floods, earthquakes, eruptions, etc. These stories, with respect to Sicily, take the form of occasional printed news, although sometimes they may be included in serials organized by different criteria (topographic/chronological/subject). Surviving documents in archives and libraries offer some opportunities to deepen the study of issues concerning the circulation and dissemination of news about the same event, their credibility, their formal characters and content. Very rare printed ephemera and ha…
Gibellina: avanguardia di città cosmopolita
2021
Gibellina è città tellurica per orogenesi: rinasce dopo un drammatico terremoto e, con la sua peculiarità di città d’arte, produce un sisma che scuote le incrostazioni dell’urbanistica, facendosi avanguardia di una città aperta al mondo, ai mondi della cultura contemporanea: l’architettura, l’arte, il teatro. La sua storia si intreccia, anticipa e contiene altre storie urbanistiche siciliane, mediterranee ed europee. Per il piccolo centro rurale della Sicilia il terremoto ha segnato una netta frattura nella sua continuità storica: il sito originario è stato abbandonato e per gli abitanti superstiti è stata costruita ex novo un’altra città. Una città “altra”, aliena al contesto sociocultural…
TERREMOTO E RICOSTRUZIONE: MESSINA 1908, VERSO UNA PROGETTAZIONE “CONSAPEVOLE” : La teoria della maggiore resistenza delle strutture “circolari” e il…
2019
TERREMOTO E RICOSTRUZIONE: MESSINA 1908, VERSO UNA PROGETTAZIONE “CONSAPEVOLE” La teoria della maggiore resistenza delle strutture “circolari” e il contributo della pubblicistica al dibattito sulla costruzione antisismica. Le storie raccontate in questo volume esaminano congiuntamente il duplice sguardo della ricerca sulla progettazione orientata in senso antisismico e sviluppata nell’ambito del dibattito nato a Messina dopo il terremoto del 1908. Se ampie si rivelano le testimonianze di forme di progettazioni “consapevoli”, cioè di accorgimenti che integrano il problema sismico all’interno di convenzioni costruttive di durata secolare, durante le fasi che hanno preceduto le molteplici rico…